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dnl Copyright © 2011-2014 Intel Corporation
dnl Copyright © 2011-2014 Emil Velikov <emil.l.velikov@gmail.com>
dnl Copyright © 2007-2010 Dan Nicholson
dnl Copyright © 2010-2014 Marek Olšák <maraeo@gmail.com>
dnl Copyright © 2010-2014 Christian König
dnl Copyright © 2012-2014 Tom Stellard <tstellar@gmail.com>
dnl Copyright © 2009-2012 Jakob Bornecrantz
dnl Copyright © 2009-2014 Jon TURNEY
dnl Copyright © 2011-2012 Benjamin Franzke
dnl Copyright © 2008-2014 David Airlie
dnl Copyright © 2009-2013 Brian Paul
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dnl Copyright © 2003-2007 Keith Packard, Daniel Stone
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dnl
dnl Permission is hereby granted, free of charge, to any person obtaining a
dnl copy of this software and associated documentation files (the "Software"),
dnl to deal in the Software without restriction, including without limitation
dnl the rights to use, copy, modify, merge, publish, distribute, sublicense,
dnl and/or sell copies of the Software, and to permit persons to whom the
dnl Software is furnished to do so, subject to the following conditions:
dnl
dnl The above copyright notice and this permission notice (including the next
dnl paragraph) shall be included in all copies or substantial portions of the
dnl Software.
dnl
dnl THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
dnl IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
dnl FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
dnl THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
dnl LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
dnl FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
dnl DEALINGS IN THE SOFTWARE.
dnl
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dnl Process this file with autoconf to create configure.
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AC_PREREQ([2.60])
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dnl Tell the user about autoconf.html in the --help output
m4_divert_once([HELP_END], [
See docs/autoconf.html for more details on the options for Mesa.])

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m4_define(MESA_VERSION, m4_normalize(m4_include(VERSION)))
AC_INIT([Mesa], [MESA_VERSION],
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    [https://bugs.freedesktop.org/enter_bug.cgi?product=Mesa])
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AC_CONFIG_AUX_DIR([bin])
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AC_CONFIG_MACRO_DIR([m4])
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AC_CANONICAL_SYSTEM
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AM_INIT_AUTOMAKE([foreign tar-ustar dist-xz subdir-objects])
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dnl We only support native Windows builds (MinGW/MSVC) through SCons.
case "$host_os" in
mingw*)
    AC_MSG_ERROR([MinGW build not supported through autoconf/automake, use SCons instead])
    ;;
esac

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# Support silent build rules, requires at least automake-1.11. Disable
# by either passing --disable-silent-rules to configure or passing V=1
# to make
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m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])],
    [AC_SUBST([AM_DEFAULT_VERBOSITY], [1])])
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m4_ifdef([AM_PROG_AR], [AM_PROG_AR])

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dnl Set internal versions
OSMESA_VERSION=8
AC_SUBST([OSMESA_VERSION])
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OPENCL_VERSION=1
AC_SUBST([OPENCL_VERSION])
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dnl Versions for external dependencies
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LIBDRM_REQUIRED=2.4.66
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LIBDRM_RADEON_REQUIRED=2.4.56
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LIBDRM_AMDGPU_REQUIRED=2.4.63
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LIBDRM_INTEL_REQUIRED=2.4.61
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LIBDRM_NVVIEUX_REQUIRED=2.4.66
LIBDRM_NOUVEAU_REQUIRED=2.4.66
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LIBDRM_FREEDRENO_REQUIRED=2.4.74
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LIBDRM_VC4_REQUIRED=2.4.69
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LIBDRM_ETNAVIV_REQUIRED=2.4.74
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DRI2PROTO_REQUIRED=2.6
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DRI3PROTO_REQUIRED=1.0
PRESENTPROTO_REQUIRED=1.0
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GLPROTO_REQUIRED=1.4.14
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LIBOMXIL_BELLAGIO_REQUIRED=0.0
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LIBVA_REQUIRED=0.38.0
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VDPAU_REQUIRED=1.1
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WAYLAND_REQUIRED=1.11
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XCB_REQUIRED=1.9.3
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XCBDRI2_REQUIRED=1.8
XCBGLX_REQUIRED=1.8.1
XSHMFENCE_REQUIRED=1.1
XVMC_REQUIRED=1.0.6
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PYTHON_MAKO_REQUIRED=0.8.0
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LIBSENSORS_REQUIRED=4.0.0
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dnl LLVM versions
LLVM_REQUIRED_GALLIUM=3.3.0
LLVM_REQUIRED_OPENCL=3.6.0
LLVM_REQUIRED_R600=3.6.0
LLVM_REQUIRED_RADEONSI=3.6.0
LLVM_REQUIRED_RADV=3.9.0
LLVM_REQUIRED_SWR=3.6.0

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dnl Check for progs
AC_PROG_CPP
AC_PROG_CC
AC_PROG_CXX
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AM_PROG_CC_C_O
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AM_PROG_AS
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AX_CHECK_GNU_MAKE
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AC_CHECK_PROGS([PYTHON2], [python2.7 python2 python])
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AC_PROG_SED
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AC_PROG_MKDIR_P
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AC_SYS_LARGEFILE

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LT_PREREQ([2.2])
LT_INIT([disable-static])

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AC_CHECK_PROG(RM, rm, [rm -f])
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AC_CHECK_PROG(XXD, xxd, [xxd])
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AX_PROG_BISON([],
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              AS_IF([test ! -f "$srcdir/src/compiler/glsl/glcpp/glcpp-parse.c"],
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                    [AC_MSG_ERROR([bison not found - unable to compile glcpp-parse.y])]))
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AX_PROG_FLEX([],
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             AS_IF([test ! -f "$srcdir/src/compiler/glsl/glcpp/glcpp-lex.c"],
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                   [AC_MSG_ERROR([flex not found - unable to compile glcpp-lex.l])]))
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AC_CHECK_PROG(INDENT, indent, indent, cat)
if test "x$INDENT" != "xcat"; then
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    # Only GNU indent is supported
    INDENT_VERSION=`indent --version | grep GNU`
    if test $? -eq 0; then
       AC_SUBST(INDENT_FLAGS, '-i4 -nut -br -brs -npcs -ce -TGLubyte -TGLbyte -TBool')
    else
       INDENT="cat"
    fi
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fi

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AX_CHECK_PYTHON_MAKO_MODULE($PYTHON_MAKO_REQUIRED)
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if test -z "$PYTHON2"; then
    if test ! -f "$srcdir/src/util/format_srgb.c"; then
        AC_MSG_ERROR([Python not found - unable to generate sources])
    fi
else
    if test "x$acv_mako_found" = xno; then
        if test ! -f "$srcdir/src/mesa/main/format_unpack.c"; then
            AC_MSG_ERROR([Python mako module v$PYTHON_MAKO_REQUIRED or higher not found])
        fi
    fi
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fi
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AC_PROG_INSTALL

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dnl We need a POSIX shell for parts of the build. Assume we have one
dnl in most cases.
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case "$host_os" in
solaris*)
    # Solaris /bin/sh is too old/non-POSIX compliant
    AC_PATH_PROGS(POSIX_SHELL, [ksh93 ksh sh])
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    SHELL="$POSIX_SHELL"
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    ;;
esac

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dnl clang is mostly GCC-compatible, but its version is much lower,
dnl so we have to check for it.
AC_MSG_CHECKING([if compiling with clang])

AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([], [[
#ifndef __clang__
       not clang
#endif
]])],
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[acv_mesa_CLANG=yes], [acv_mesa_CLANG=no])
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AC_MSG_RESULT([$acv_mesa_CLANG])
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dnl If we're using GCC, make sure that it is at least version 4.2.0.  Older
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dnl versions are explictly not supported.
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GEN_ASM_OFFSETS=no
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USE_GNU99=no
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if test "x$GCC" = xyes -a "x$acv_mesa_CLANG" = xno; then
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    AC_MSG_CHECKING([whether gcc version is sufficient])
    major=0
    minor=0

    GCC_VERSION=`$CC -dumpversion`
    if test $? -eq 0; then
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        GCC_VERSION_MAJOR=`echo $GCC_VERSION | cut -d. -f1`
        GCC_VERSION_MINOR=`echo $GCC_VERSION | cut -d. -f2`
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    fi

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    if test $GCC_VERSION_MAJOR -lt 4 -o $GCC_VERSION_MAJOR -eq 4 -a $GCC_VERSION_MINOR -lt 2 ; then
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        AC_MSG_RESULT([no])
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        AC_MSG_ERROR([If using GCC, version 4.2.0 or later is required.])
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    else
        AC_MSG_RESULT([yes])
    fi
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    if test $GCC_VERSION_MAJOR -lt 4 -o $GCC_VERSION_MAJOR -eq 4 -a $GCC_VERSION_MINOR -lt 6 ; then
        USE_GNU99=yes
    fi
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    if test "x$cross_compiling" = xyes; then
        GEN_ASM_OFFSETS=yes
    fi
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fi
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dnl We don't support building Mesa with Sun C compiler
dnl https://bugs.freedesktop.org/show_bug.cgi?id=93189
AC_CHECK_DECL([__SUNPRO_C], [SUNCC=yes], [SUNCC=no])
if test "x$SUNCC" = xyes; then
    AC_MSG_ERROR([Building with Sun C compiler is not supported, use GCC instead.])
fi

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dnl Check for compiler builtins
AX_GCC_BUILTIN([__builtin_bswap32])
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AX_GCC_BUILTIN([__builtin_bswap64])
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AX_GCC_BUILTIN([__builtin_clz])
AX_GCC_BUILTIN([__builtin_clzll])
AX_GCC_BUILTIN([__builtin_ctz])
AX_GCC_BUILTIN([__builtin_expect])
AX_GCC_BUILTIN([__builtin_ffs])
AX_GCC_BUILTIN([__builtin_ffsll])
AX_GCC_BUILTIN([__builtin_popcount])
AX_GCC_BUILTIN([__builtin_popcountll])
AX_GCC_BUILTIN([__builtin_unreachable])
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AX_GCC_FUNC_ATTRIBUTE([const])
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AX_GCC_FUNC_ATTRIBUTE([flatten])
AX_GCC_FUNC_ATTRIBUTE([format])
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AX_GCC_FUNC_ATTRIBUTE([malloc])
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AX_GCC_FUNC_ATTRIBUTE([packed])
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AX_GCC_FUNC_ATTRIBUTE([pure])
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AX_GCC_FUNC_ATTRIBUTE([returns_nonnull])
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AX_GCC_FUNC_ATTRIBUTE([unused])
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AX_GCC_FUNC_ATTRIBUTE([visibility])
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AX_GCC_FUNC_ATTRIBUTE([warn_unused_result])
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AX_GCC_FUNC_ATTRIBUTE([weak])
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AM_CONDITIONAL([GEN_ASM_OFFSETS], test "x$GEN_ASM_OFFSETS" = xyes)
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dnl Make sure the pkg-config macros are defined
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m4_ifndef([PKG_PROG_PKG_CONFIG],
    [m4_fatal([Could not locate the pkg-config autoconf macros.
  These are usually located in /usr/share/aclocal/pkg.m4. If your macros
  are in a different location, try setting the environment variable
  ACLOCAL="aclocal -I/other/macro/dir" before running autoreconf.])])
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PKG_PROG_PKG_CONFIG()

dnl LIB_DIR - library basename
LIB_DIR=`echo $libdir | $SED 's%.*/%%'`
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AC_SUBST([LIB_DIR])
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dnl Cache LDFLAGS and CPPFLAGS so we can add to them and restore later
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_SAVE_LDFLAGS="$LDFLAGS"
_SAVE_CPPFLAGS="$CPPFLAGS"

dnl Compiler macros
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DEFINES="-D__STDC_LIMIT_MACROS -D__STDC_CONSTANT_MACROS"
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AC_SUBST([DEFINES])
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android=no
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case "$host_os" in
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*-android)
    android=yes
    ;;
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linux*|*-gnu*|gnu*|cygwin*)
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    DEFINES="$DEFINES -D_GNU_SOURCE"
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    ;;
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solaris*)
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    DEFINES="$DEFINES -DSVR4"
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    ;;
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esac

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AM_CONDITIONAL(HAVE_ANDROID, test "x$android" = xyes)

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dnl Add flags for gcc and g++
if test "x$GCC" = xyes; then
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    CFLAGS="$CFLAGS -Wall"

    if test "x$USE_GNU99" = xyes; then
	CFLAGS="$CFLAGS -std=gnu99"
    else
	CFLAGS="$CFLAGS -std=c99"
    fi
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    # Enable -Werror=implicit-function-declaration and
    # -Werror=missing-prototypes, if available, or otherwise, just
    # -Wmissing-prototypes.  This is particularly useful to avoid
    # generating a loadable driver module that has undefined symbols.
    save_CFLAGS="$CFLAGS"
    AC_MSG_CHECKING([whether $CC supports -Werror=missing-prototypes])
    CFLAGS="$CFLAGS -Werror=implicit-function-declaration"
    CFLAGS="$CFLAGS -Werror=missing-prototypes"
    AC_LINK_IFELSE([AC_LANG_PROGRAM()],
		   AC_MSG_RESULT([yes]),
		   [CFLAGS="$save_CFLAGS -Wmissing-prototypes";
		    AC_MSG_RESULT([no])]);
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    # Enable -fvisibility=hidden if using a gcc that supports it
    save_CFLAGS="$CFLAGS"
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    AC_MSG_CHECKING([whether $CC supports -fvisibility=hidden])
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    VISIBILITY_CFLAGS="-fvisibility=hidden"
    CFLAGS="$CFLAGS $VISIBILITY_CFLAGS"
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    AC_LINK_IFELSE([AC_LANG_PROGRAM()], AC_MSG_RESULT([yes]),
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		   [VISIBILITY_CFLAGS=""; AC_MSG_RESULT([no])]);

    # Restore CFLAGS; VISIBILITY_CFLAGS are added to it where needed.
    CFLAGS=$save_CFLAGS
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    # We don't want floating-point math functions to set errno or trap
    CFLAGS="$CFLAGS -fno-math-errno -fno-trapping-math"
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    # Flags to help ensure that certain portions of the code -- and only those
    # portions -- can be built with MSVC:
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    # - src/util, src/gallium/auxiliary, rc/gallium/drivers/llvmpipe, and
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    # - non-Linux/Posix OpenGL portions needs to build on MSVC 2013 (which
    #   supports most of C99)
    # - the rest has no compiler compiler restrictions
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    MSVC2013_COMPAT_CFLAGS="-Werror=pointer-arith"
    MSVC2013_COMPAT_CXXFLAGS="-Werror=pointer-arith"

    # Enable -Werror=vla if compiler supports it
    save_CFLAGS="$CFLAGS"
    AC_MSG_CHECKING([whether $CC supports -Werror=vla])
    CFLAGS="$CFLAGS -Werror=vla"
    AC_LINK_IFELSE([AC_LANG_PROGRAM()],
		   [MSVC2013_COMPAT_CFLAGS="$MSVC2013_COMPAT_CFLAGS -Werror=vla";
		    MSVC2013_COMPAT_CXXFLAGS="$MSVC2013_COMPAT_CXXFLAGS -Werror=vla";
		    AC_MSG_RESULT([yes])],
		    AC_MSG_RESULT([no]));
    CFLAGS="$save_CFLAGS"
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fi
if test "x$GXX" = xyes; then
    CXXFLAGS="$CXXFLAGS -Wall"
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    # Enable -fvisibility=hidden if using a gcc that supports it
    save_CXXFLAGS="$CXXFLAGS"
    AC_MSG_CHECKING([whether $CXX supports -fvisibility=hidden])
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    VISIBILITY_CXXFLAGS="-fvisibility=hidden"
    CXXFLAGS="$CXXFLAGS $VISIBILITY_CXXFLAGS"
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    AC_LANG_PUSH([C++])
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    AC_LINK_IFELSE([AC_LANG_PROGRAM()], AC_MSG_RESULT([yes]),
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		   [VISIBILITY_CXXFLAGS="" ; AC_MSG_RESULT([no])]);
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    AC_LANG_POP([C++])
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    # Restore CXXFLAGS; VISIBILITY_CXXFLAGS are added to it where needed.
    CXXFLAGS=$save_CXXFLAGS
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    # We don't want floating-point math functions to set errno or trap
    CXXFLAGS="$CXXFLAGS -fno-math-errno -fno-trapping-math"
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fi

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AC_SUBST([MSVC2013_COMPAT_CFLAGS])
AC_SUBST([MSVC2013_COMPAT_CXXFLAGS])

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dnl even if the compiler appears to support it, using visibility attributes isn't
dnl going to do anything useful currently on cygwin apart from emit lots of warnings
case "$host_os" in
cygwin*)
    VISIBILITY_CFLAGS=""
    VISIBILITY_CXXFLAGS=""
    ;;
esac

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AC_SUBST([VISIBILITY_CFLAGS])
AC_SUBST([VISIBILITY_CXXFLAGS])

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dnl
dnl Optional flags, check for compiler support
dnl
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SSE41_CFLAGS="-msse4.1"
dnl Code compiled by GCC with -msse* assumes a 16 byte aligned
dnl stack, but on x86-32 such alignment is not guaranteed.
case "$target_cpu" in
i?86)
    SSE41_CFLAGS="$SSE41_CFLAGS -mstackrealign"
    ;;
esac
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save_CFLAGS="$CFLAGS"
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CFLAGS="$SSE41_CFLAGS $CFLAGS"
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AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
#include <smmintrin.h>
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int param;
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int main () {
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    __m128i a = _mm_set1_epi32 (param), b = _mm_set1_epi32 (param + 1), c;
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    c = _mm_max_epu32(a, b);
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    return _mm_cvtsi128_si32(c);
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}]])], SSE41_SUPPORTED=1)
CFLAGS="$save_CFLAGS"
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if test "x$SSE41_SUPPORTED" = x1; then
    DEFINES="$DEFINES -DUSE_SSE41"
fi
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AM_CONDITIONAL([SSE41_SUPPORTED], [test x$SSE41_SUPPORTED = x1])
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AC_SUBST([SSE41_CFLAGS], $SSE41_CFLAGS)
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dnl Check for new-style atomic builtins
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
int main() {
    int n;
    return __atomic_load_n(&n, __ATOMIC_ACQUIRE);
}]])], GCC_ATOMIC_BUILTINS_SUPPORTED=1)
if test "x$GCC_ATOMIC_BUILTINS_SUPPORTED" = x1; then
    DEFINES="$DEFINES -DUSE_GCC_ATOMIC_BUILTINS"
fi
AM_CONDITIONAL([GCC_ATOMIC_BUILTINS_SUPPORTED], [test x$GCC_ATOMIC_BUILTINS_SUPPORTED = x1])

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dnl Check for Endianness
AC_C_BIGENDIAN(
   little_endian=no,
   little_endian=yes,
   little_endian=no,
   little_endian=no
)

dnl Check for POWER8 Architecture
PWR8_CFLAGS="-mpower8-vector"
have_pwr8_intrinsics=no
AC_MSG_CHECKING(whether gcc supports -mpower8-vector)
save_CFLAGS=$CFLAGS
CFLAGS="$PWR8_CFLAGS $CFLAGS"
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
#if defined(__GNUC__) && (__GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 8))
#error "Need GCC >= 4.8 for sane POWER8 support"
#endif
#include <altivec.h>
int main () {
    vector unsigned char r;
    vector unsigned int v = vec_splat_u32 (1);
    r = __builtin_vec_vgbbd ((vector unsigned char) v);
    return 0;
}]])], have_pwr8_intrinsics=yes)
CFLAGS=$save_CFLAGS

AC_ARG_ENABLE(pwr8,
   [AC_HELP_STRING([--disable-pwr8-inst],
                   [disable POWER8-specific instructions])],
   [enable_pwr8=$enableval], [enable_pwr8=auto])

if test "x$enable_pwr8" = xno ; then
   have_pwr8_intrinsics=disabled
fi

if test $have_pwr8_intrinsics = yes && test $little_endian = yes ; then
   DEFINES="$DEFINES -D_ARCH_PWR8"
   CXXFLAGS="$CXXFLAGS $PWR8_CFLAGS"
   CFLAGS="$CFLAGS $PWR8_CFLAGS"
else
   PWR8_CFLAGS=
fi

AC_MSG_RESULT($have_pwr8_intrinsics)
if test "x$enable_pwr8" = xyes && test $have_pwr8_intrinsics = no ; then
   AC_MSG_ERROR([POWER8 compiler support not detected])
fi

if test $have_pwr8_intrinsics = yes && test $little_endian = no ; then
   AC_MSG_WARN([POWER8 optimization is enabled only on POWER8 Little-Endian])
fi

AC_SUBST([PWR8_CFLAGS], $PWR8_CFLAGS)

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dnl Can't have static and shared libraries, default to static if user
dnl explicitly requested. If both disabled, set to static since shared
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dnl was explicitly requested.
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case "x$enable_static$enable_shared" in
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xyesyes)
    AC_MSG_WARN([Cannot build static and shared libraries, disabling shared])
    enable_shared=no
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    ;;
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xnono)
    AC_MSG_WARN([Cannot disable both static and shared libraries, enabling shared])
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    enable_shared=yes
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    ;;
esac

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AM_CONDITIONAL(BUILD_SHARED, test "x$enable_shared" = xyes)

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dnl
dnl other compiler options
dnl
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AC_ARG_ENABLE([debug],
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    [AS_HELP_STRING([--enable-debug],
        [use debug compiler flags and macros @<:@default=disabled@:>@])],
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    [enable_debug="$enableval"],
    [enable_debug=no]
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)
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AC_ARG_ENABLE([profile],
    [AS_HELP_STRING([--enable-profile],
        [enable profiling of code @<:@default=disabled@:>@])],
    [enable_profile="$enableval"],
    [enable_profile=no]
)

if test "x$enable_profile" = xyes; then
    DEFINES="$DEFINES -DPROFILE"
    if test "x$GCC" = xyes; then
        CFLAGS="$CFLAGS -fno-omit-frame-pointer"
    fi
    if test "x$GXX" = xyes; then
        CXXFLAGS="$CXXFLAGS -fno-omit-frame-pointer"
    fi
fi

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if test "x$enable_debug" = xyes; then
    DEFINES="$DEFINES -DDEBUG"
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    if test "x$enable_profile" = xyes; then
        AC_MSG_WARN([Debug and Profile are enabled at the same time])
    fi
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    if test "x$GCC" = xyes; then
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        if ! echo "$CFLAGS" | grep -q -e '-g'; then
            CFLAGS="$CFLAGS -g"
        fi
        if ! echo "$CFLAGS" | grep -q -e '-O'; then
            CFLAGS="$CFLAGS -O0"
        fi
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    fi
    if test "x$GXX" = xyes; then
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        if ! echo "$CXXFLAGS" | grep -q -e '-g'; then
            CXXFLAGS="$CXXFLAGS -g"
        fi
        if ! echo "$CXXFLAGS" | grep -q -e '-O'; then
            CXXFLAGS="$CXXFLAGS -O0"
        fi
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    fi
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else
   DEFINES="$DEFINES -DNDEBUG"
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fi
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DEFAULT_GL_LIB_NAME=GL

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dnl
dnl Check if linker supports -Bsymbolic
dnl
save_LDFLAGS=$LDFLAGS
LDFLAGS="$LDFLAGS -Wl,-Bsymbolic"
AC_MSG_CHECKING([if ld supports -Bsymbolic])
AC_LINK_IFELSE(
    [AC_LANG_SOURCE([int main() { return 0;}])],
    [AC_MSG_RESULT([yes])
        BSYMBOLIC="-Wl,-Bsymbolic";],
    [AC_MSG_RESULT([no])
        BSYMBOLIC="";])
LDFLAGS=$save_LDFLAGS

AC_SUBST([BSYMBOLIC])

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dnl
dnl Check if linker supports garbage collection
dnl
save_LDFLAGS=$LDFLAGS
LDFLAGS="$LDFLAGS -Wl,--gc-sections"
AC_MSG_CHECKING([whether ld supports --gc-sections])
AC_LINK_IFELSE(
    [AC_LANG_SOURCE([static char UnusedFunc() { return 5; } int main() { return 0;}])],
    [AC_MSG_RESULT([yes])
        GC_SECTIONS="-Wl,--gc-sections";],
    [AC_MSG_RESULT([no])
        GC_SECTIONS="";])
LDFLAGS=$save_LDFLAGS

AC_SUBST([GC_SECTIONS])

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dnl
dnl OpenBSD does not have DT_NEEDED entries for libc by design
dnl so when these flags are passed to ld via libtool the checks will fail
dnl
case "$host_os" in
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openbsd* | darwin* )
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    LD_NO_UNDEFINED="" ;;
*)
    LD_NO_UNDEFINED="-Wl,--no-undefined" ;;
esac

AC_SUBST([LD_NO_UNDEFINED])

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dnl
dnl Check if linker supports version scripts
dnl
AC_MSG_CHECKING([if the linker supports version-scripts])
save_LDFLAGS=$LDFLAGS
LDFLAGS="$LDFLAGS -Wl,--version-script=conftest.map"
cat > conftest.map <<EOF
VERSION_1 {
     global:
         main;

     local:
         *;
};
EOF
AC_LINK_IFELSE(
    [AC_LANG_SOURCE([int main() { return 0;}])],
    [have_ld_version_script=yes;AC_MSG_RESULT(yes)],
    [have_ld_version_script=no; AC_MSG_RESULT(no)])
LDFLAGS=$save_LDFLAGS
AM_CONDITIONAL(HAVE_LD_VERSION_SCRIPT, test "$have_ld_version_script" = "yes")

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dnl
dnl Check if linker supports dynamic list files
dnl
AC_MSG_CHECKING([if the linker supports --dynamic-list])
save_LDFLAGS=$LDFLAGS
LDFLAGS="$LDFLAGS -Wl,--dynamic-list=conftest.dyn"
cat > conftest.dyn <<EOF
{
	radeon_drm_winsys_create;
};
EOF
AC_LINK_IFELSE(
    [AC_LANG_SOURCE([int main() { return 0;}])],
    [have_ld_dynamic_list=yes;AC_MSG_RESULT(yes)],
    [have_ld_dynamic_list=no; AC_MSG_RESULT(no)])
LDFLAGS=$save_LDFLAGS
AM_CONDITIONAL(HAVE_LD_DYNAMIC_LIST, test "$have_ld_dynamic_list" = "yes")

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dnl
dnl compatibility symlinks
dnl
case "$host_os" in
linux* )
    HAVE_COMPAT_SYMLINKS=yes ;;
* )
    HAVE_COMPAT_SYMLINKS=no ;;
esac

AM_CONDITIONAL(HAVE_COMPAT_SYMLINKS, test "x$HAVE_COMPAT_SYMLINKS" = xyes)

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DEFAULT_GL_LIB_NAME=GL

dnl
dnl Libglvnd configuration
dnl
AC_ARG_ENABLE([libglvnd],
    [AS_HELP_STRING([--enable-libglvnd],
        [Build for libglvnd @<:@default=disabled@:>@])],
    [enable_libglvnd="$enableval"],
    [enable_libglvnd=no])
AM_CONDITIONAL(USE_LIBGLVND_GLX, test "x$enable_libglvnd" = xyes)
#AM_COND_IF([USE_LIBGLVND_GLX], [DEFINES="${DEFINES} -DUSE_LIBGLVND_GLX=1"])
if test "x$enable_libglvnd" = xyes ; then
    DEFINES="${DEFINES} -DUSE_LIBGLVND_GLX=1"
    DEFAULT_GL_LIB_NAME=GLX_mesa
fi

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dnl
dnl library names
dnl
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dnl Unfortunately we need to do a few things that libtool can't help us with,
dnl so we need some knowledge of shared library filenames:
dnl
dnl LIB_EXT is the extension used when creating symlinks for alternate
dnl filenames for a shared library which will be dynamically loaded
dnl
dnl IMP_LIB_EXT is the extension used when checking for the presence of a
dnl the file for a shared library we wish to link with
dnl
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case "$host_os" in
darwin* )
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    LIB_EXT='dylib'
    IMP_LIB_EXT=$LIB_EXT
    ;;
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cygwin* )
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    LIB_EXT='dll'
    IMP_LIB_EXT='dll.a'
    ;;
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aix* )
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    LIB_EXT='a'
    IMP_LIB_EXT=$LIB_EXT
    ;;
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* )
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    LIB_EXT='so'
    IMP_LIB_EXT=$LIB_EXT
    ;;
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esac
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AC_SUBST([LIB_EXT])

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AC_ARG_WITH([gl-lib-name],
  [AS_HELP_STRING([--with-gl-lib-name@<:@=NAME@:>@],
    [specify GL library name @<:@default=GL@:>@])],
  [GL_LIB=$withval],
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  [GL_LIB="$DEFAULT_GL_LIB_NAME"])
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AC_ARG_WITH([osmesa-lib-name],
  [AS_HELP_STRING([--with-osmesa-lib-name@<:@=NAME@:>@],
    [specify OSMesa library name @<:@default=OSMesa@:>@])],
  [OSMESA_LIB=$withval],
  [OSMESA_LIB=OSMesa])
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AS_IF([test "x$GL_LIB" = xyes], [GL_LIB="$DEFAULT_GL_LIB_NAME"])
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AS_IF([test "x$OSMESA_LIB" = xyes], [OSMESA_LIB=OSMesa])
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dnl
dnl Mangled Mesa support
dnl
AC_ARG_ENABLE([mangling],
  [AS_HELP_STRING([--enable-mangling],
    [enable mangled symbols and library name @<:@default=disabled@:>@])],
  [enable_mangling="${enableval}"],
  [enable_mangling=no]
)
if test "x${enable_mangling}" = "xyes" ; then
  DEFINES="${DEFINES} -DUSE_MGL_NAMESPACE"
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  GL_LIB="Mangled${GL_LIB}"
  OSMESA_LIB="Mangled${OSMESA_LIB}"
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fi
AC_SUBST([GL_LIB])
AC_SUBST([OSMESA_LIB])

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dnl
dnl potentially-infringing-but-nobody-knows-for-sure stuff
dnl
AC_ARG_ENABLE([texture-float],
    [AS_HELP_STRING([--enable-texture-float],
        [enable floating-point textures and renderbuffers @<:@default=disabled@:>@])],
    [enable_texture_float="$enableval"],
    [enable_texture_float=no]
)
if test "x$enable_texture_float" = xyes; then
    AC_MSG_WARN([Floating-point textures enabled.])
    AC_MSG_WARN([Please consult docs/patents.txt with your lawyer before building Mesa.])
    DEFINES="$DEFINES -DTEXTURE_FLOAT_ENABLED"
fi

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dnl
dnl Arch/platform-specific settings
dnl
AC_ARG_ENABLE([asm],
    [AS_HELP_STRING([--disable-asm],
        [disable assembly usage @<:@default=enabled on supported plaforms@:>@])],
    [enable_asm="$enableval"],
    [enable_asm=yes]
)
asm_arch=""
AC_MSG_CHECKING([whether to enable assembly])
test "x$enable_asm" = xno && AC_MSG_RESULT([no])
# disable if cross compiling on x86/x86_64 since we must run gen_matypes
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if test "x$enable_asm" = xyes -a "x$cross_compiling" = xyes; then
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    case "$host_cpu" in
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    i?86 | x86_64 | amd64)
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        if test "x$host_cpu" != "x$target_cpu"; then
            enable_asm=no
            AC_MSG_RESULT([no, cross compiling])
        fi
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        ;;
    esac
fi
# check for supported arches
if test "x$enable_asm" = xyes; then
    case "$host_cpu" in
    i?86)
        case "$host_os" in
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        linux* | *freebsd* | dragonfly* | *netbsd* | openbsd* | gnu*)
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            asm_arch=x86
            ;;
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        esac
        ;;
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    x86_64|amd64)
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        case "$host_os" in
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        linux* | *freebsd* | dragonfly* | *netbsd* | openbsd*)
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            asm_arch=x86_64
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            ;;
        esac
        ;;
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    sparc*)
        case "$host_os" in
        linux*)
            asm_arch=sparc
            ;;
        esac
        ;;
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    esac

    case "$asm_arch" in
    x86)
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        DEFINES="$DEFINES -DUSE_X86_ASM -DUSE_MMX_ASM -DUSE_3DNOW_ASM -DUSE_SSE_ASM"
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        AC_MSG_RESULT([yes, x86])
        ;;
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    x86_64|amd64)
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        DEFINES="$DEFINES -DUSE_X86_64_ASM"
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        AC_MSG_RESULT([yes, x86_64])
        ;;
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    sparc)
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        DEFINES="$DEFINES -DUSE_SPARC_ASM"
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        AC_MSG_RESULT([yes, sparc])
        ;;
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    *)
        AC_MSG_RESULT([no, platform not supported])
        ;;
    esac
fi

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AC_HEADER_MAJOR
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AC_CHECK_HEADER([xlocale.h], [DEFINES="$DEFINES -DHAVE_XLOCALE_H"])
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AC_CHECK_HEADER([sys/sysctl.h], [DEFINES="$DEFINES -DHAVE_SYS_SYSCTL_H"])
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AC_CHECK_FUNC([strtof], [DEFINES="$DEFINES -DHAVE_STRTOF"])
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AC_CHECK_FUNC([mkostemp], [DEFINES="$DEFINES -DHAVE_MKOSTEMP"])
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dnl Check to see if dlopen is in default libraries (like Solaris, which
dnl has it in libc), or if libdl is needed to get it.
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AC_CHECK_FUNC([dlopen], [DEFINES="$DEFINES -DHAVE_DLOPEN"],
    [AC_CHECK_LIB([dl], [dlopen],
       [DEFINES="$DEFINES -DHAVE_DLOPEN"; DLOPEN_LIBS="-ldl"])])
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AC_SUBST([DLOPEN_LIBS])
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dnl Check if that library also has dladdr
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save_LIBS="$LIBS"
LIBS="$LIBS $DLOPEN_LIBS"
AC_CHECK_FUNCS([dladdr])
LIBS="$save_LIBS"
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case "$host_os" in
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darwin*)
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    ;;
*)
    AC_CHECK_FUNCS([clock_gettime], [CLOCK_LIB=],
                   [AC_CHECK_LIB([rt], [clock_gettime], [CLOCK_LIB=-lrt],
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                                 [AC_MSG_ERROR([Could not find clock_gettime])])])
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    AC_SUBST([CLOCK_LIB])
    ;;
esac
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dnl See if posix_memalign is available
AC_CHECK_FUNC([posix_memalign], [DEFINES="$DEFINES -DHAVE_POSIX_MEMALIGN"])

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dnl Check for pthreads
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AX_PTHREAD
if test "x$ax_pthread_ok" = xno; then
    AC_MSG_ERROR([Building mesa on this platform requires pthreads])
fi
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dnl AX_PTHREADS leaves PTHREAD_LIBS empty for gcc and sets PTHREAD_CFLAGS
dnl to -pthread, which causes problems if we need -lpthread to appear in
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dnl pkgconfig files.  Since Android doesn't have a pthread lib, this check
dnl is not valid for that platform.
if test "x$android" = xno; then
    test -z "$PTHREAD_LIBS" && PTHREAD_LIBS="-lpthread"
fi
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dnl pthread-stubs is mandatory on targets where it exists
case "$host_os" in
cygwin* )
    pthread_stubs_possible="no"
    ;;
* )
    pthread_stubs_possible="yes"
    ;;
esac

if test "x$pthread_stubs_possible" = xyes; then
    PKG_CHECK_MODULES(PTHREADSTUBS, pthread-stubs)
    AC_SUBST(PTHREADSTUBS_CFLAGS)
    AC_SUBST(PTHREADSTUBS_LIBS)
fi
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dnl SELinux awareness.
AC_ARG_ENABLE([selinux],
    [AS_HELP_STRING([--enable-selinux],
        [Build SELinux-aware Mesa @<:@default=disabled@:>@])],
    [MESA_SELINUX="$enableval"],
    [MESA_SELINUX=no])
if test "x$enable_selinux" = "xyes"; then
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    PKG_CHECK_MODULES([SELINUX], [libselinux], [],
        [AC_CHECK_HEADER([selinux/selinux.h],[],
                         [AC_MSG_ERROR([SELinux headers not found])])
         AC_CHECK_LIB([selinux],[is_selinux_enabled],[],
                      [AC_MSG_ERROR([SELinux library not found])])
         SELINUX_LIBS="-lselinux"])
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    DEFINES="$DEFINES -DMESA_SELINUX"
fi
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AC_SUBST([SELINUX_CFLAGS])
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AC_SUBST([SELINUX_LIBS])
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dnl
dnl LLVM
dnl
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AC_ARG_ENABLE([llvm-shared-libs],
    [AS_HELP_STRING([--enable-llvm-shared-libs],
        [link with LLVM shared libraries @<:@default=enabled@:>@])],
    [enable_llvm_shared_libs="$enableval"],
    [enable_llvm_shared_libs=yes])

AC_ARG_WITH([llvm-prefix],
    [AS_HELP_STRING([--with-llvm-prefix],
        [Prefix for LLVM installations in non-standard locations])],
    [llvm_prefix="$withval"],
    [llvm_prefix=''])

PKG_CHECK_MODULES([LIBELF], [libelf], [have_libelf=yes], [have_libelf=no])
if test "x$have_libelf" = xno; then
   LIBELF_LIBS=''
   LIBELF_CFLAGS=''
   AC_CHECK_LIB([elf], [elf_memory], [have_libelf=yes;LIBELF_LIBS=-lelf], [have_libelf=no])
   AC_SUBST([LIBELF_LIBS])
   AC_SUBST([LIBELF_CFLAGS])
fi

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if test -z "$LLVM_CONFIG"; then
    if test -n "$llvm_prefix"; then
        AC_PATH_TOOL([LLVM_CONFIG], [llvm-config], [no], ["$llvm_prefix/bin"])
    else
        AC_PATH_TOOL([LLVM_CONFIG], [llvm-config], [no])
    fi
fi

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llvm_add_component() {
    new_llvm_component=$1
    driver_name=$2

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    if $LLVM_CONFIG --components | grep -iqw $new_llvm_component ; then
        LLVM_COMPONENTS="${LLVM_COMPONENTS} ${new_llvm_component}"
    else
        AC_MSG_ERROR([LLVM component '$new_llvm_component' not enabled in your LLVM build. Required by $driver_name.])
    fi
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}

llvm_add_default_components() {
    driver_name=$1

    # Required default components
    llvm_add_component "bitwriter" $driver_name
    llvm_add_component "engine" $driver_name
    llvm_add_component "mcdisassembler" $driver_name
    llvm_add_component "mcjit" $driver_name

    # Optional default components
    if $LLVM_CONFIG --components | grep -iqw inteljitevents ; then
        LLVM_COMPONENTS="$LLVM_COMPONENTS inteljitevents"
    fi
}

llvm_add_target() {
    new_llvm_target=$1
    driver_name=$2

    if $LLVM_CONFIG --targets-built | grep -iqw $new_llvm_target ; then
        llvm_add_component $new_llvm_target $driver_name
    else
        AC_MSG_ERROR([LLVM target '$new_llvm_target' not enabled in your LLVM build. Required by $driver_name.])
    fi
}

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# Call this inside ` ` to get the return value.
# $1 is the llvm-config command with arguments.
strip_unwanted_llvm_flags() {
    # Use \> (marks the end of the word)
    echo `$1` | sed \
        -e 's/-march=\S*//g' \
        -e 's/-mtune=\S*//g' \
        -e 's/-mcpu=\S*//g' \
        -e 's/-DNDEBUG\>//g' \
        -e 's/-D_GNU_SOURCE\>//g' \
        -e 's/-pedantic\>//g' \
        -e 's/-Wcovered-switch-default\>//g' \
        -e 's/-O.\>//g' \
        -e 's/-g\>//g' \
        -e 's/-Wall\>//g' \
        -e 's/-Wcast-qual\>//g' \
        -e 's/-Woverloaded-virtual\>//g' \
        -e 's/-fcolor-diagnostics\>//g' \
        -e 's/-fdata-sections\>//g' \
        -e 's/-ffunction-sections\>//g' \
        -e 's/-fno-exceptions\>//g' \
        -e 's/-fomit-frame-pointer\>//g' \
        -e 's/-fvisibility-inlines-hidden\>//g' \
        -e 's/-fPIC\>//g' \
        -e 's/-fstack-protector-strong\>//g'
}

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llvm_set_environment_variables() {
    if test "x$LLVM_CONFIG" != xno; then
        LLVM_VERSION=`$LLVM_CONFIG --version | egrep -o '^[[0-9.]]+'`
        LLVM_LDFLAGS=`$LLVM_CONFIG --ldflags`
        LLVM_BINDIR=`$LLVM_CONFIG --bindir`
        LLVM_CPPFLAGS=`strip_unwanted_llvm_flags "$LLVM_CONFIG --cppflags"`
        LLVM_CFLAGS=$LLVM_CPPFLAGS   # CPPFLAGS seem to be sufficient
        LLVM_CXXFLAGS=`strip_unwanted_llvm_flags "$LLVM_CONFIG --cxxflags"`
        LLVM_INCLUDEDIR=`$LLVM_CONFIG --includedir`
        LLVM_LIBDIR=`$LLVM_CONFIG --libdir`

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        # We need to respect LLVM_CFLAGS when compiling LLVM headers.
        save_CFLAGS="$CFLAGS"
        CFLAGS="$CFLAGS $LLVM_CFLAGS"

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        AC_COMPUTE_INT([LLVM_VERSION_MAJOR], [LLVM_VERSION_MAJOR],
            [#include "${LLVM_INCLUDEDIR}/llvm/Config/llvm-config.h"])
        AC_COMPUTE_INT([LLVM_VERSION_MINOR], [LLVM_VERSION_MINOR],
            [#include "${LLVM_INCLUDEDIR}/llvm/Config/llvm-config.h"])
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        AC_COMPUTE_INT([LLVM_VERSION_PATCH], [LLVM_VERSION_PATCH],
            [#include "${LLVM_INCLUDEDIR}/llvm/Config/llvm-config.h"])
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        CFLAGS="$save_CFLAGS"

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        # Only needed for LLVM < 3.6.0
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        if test -z "$LLVM_VERSION_PATCH"; then
            LLVM_VERSION_PATCH=0
        fi

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        if test "$LLVM_VERSION_MINOR" -lt 10; then
            LLVM_VERSION_INT="${LLVM_VERSION_MAJOR}0${LLVM_VERSION_MINOR}"
        else
            LLVM_VERSION_INT="${LLVM_VERSION_MAJOR}${LLVM_VERSION_MINOR}"
        fi
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        FOUND_LLVM=yes
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        USE_LLVM=no
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    else
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        FOUND_LLVM=no
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        USE_LLVM=no
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        LLVM_VERSION_INT=0
    fi
}

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llvm_require_version() {
    USE_LLVM=yes

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    if test "x$FOUND_LLVM" = xno; then
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        AC_MSG_ERROR([LLVM $1 or newer is required for $2])
        return
    fi

    llvm_target_version_major=`echo $1 | cut -d. -f1 | egrep -o '^[[0-9]]+'`
    llvm_target_version_minor=`echo $1 | cut -d. -f2 | egrep -o '^[[0-9]]+'`
    llvm_target_version_patch=`echo $1 | cut -d. -f3 | egrep -o '^[[0-9]]+'`

    if test "$LLVM_VERSION_MAJOR" -gt "$llvm_target_version_major"; then
        # major > required major
        #  --> OK
        return
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    fi
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    if test "$LLVM_VERSION_MAJOR" -eq "$llvm_target_version_major"; then
        if test "$LLVM_VERSION_MINOR" -gt "$llvm_target_version_minor"; then
            # major = required major and
            # minor > required minor
            #  --> OK
            return
        else
            if test "$LLVM_VERSION_MINOR" -eq "$llvm_target_version_minor"; then
                if test "$LLVM_VERSION_PATCH" -ge "$llvm_target_version_patch"; then
                    # major = required major and
                    # minor = required minor and
                    # patch >= required patch
                    #  --> OK
                    return
                fi
            fi
        fi
    fi

    AC_MSG_ERROR([LLVM $1 or newer is required for $2])
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}

radeon_llvm_check() {
    if test ${LLVM_VERSION_INT} -lt 307; then
        amdgpu_llvm_target_name='r600'
    else
        amdgpu_llvm_target_name='amdgpu'
    fi

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    llvm_require_version $*
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    llvm_add_target $amdgpu_llvm_target_name $2
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    llvm_add_default_components $2
    llvm_add_component "bitreader" $2
    llvm_add_component "ipo" $2
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    NEED_RADEON_LLVM=yes
    if test "x$have_libelf" != xyes; then
       AC_MSG_ERROR([$1 requires libelf when using llvm])
    fi
}

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llvm_set_environment_variables

AC_SUBST([LLVM_BINDIR])
AC_SUBST([LLVM_CFLAGS])
AC_SUBST([LLVM_CPPFLAGS])
AC_SUBST([LLVM_CXXFLAGS])
AC_SUBST([LLVM_LIBDIR])
AC_SUBST([LLVM_LIBS])
AC_SUBST([LLVM_LDFLAGS])
AC_SUBST([LLVM_INCLUDEDIR])
AC_SUBST([LLVM_VERSION])

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dnl Options for APIs
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AC_ARG_ENABLE([opengl],
    [AS_HELP_STRING([--disable-opengl],
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        [disable support for standard OpenGL API @<:@default=enabled@:>@])],
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    [enable_opengl="$enableval"],
    [enable_opengl=yes])
AC_ARG_ENABLE([gles1],
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    [AS_HELP_STRING([--disable-gles1],
        [disable support for OpenGL ES 1.x API @<:@default=enabled@:>@])],
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    [enable_gles1="$enableval"],
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    [enable_gles1=yes])
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AC_ARG_ENABLE([gles2],
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    [AS_HELP_STRING([--disable-gles2],
        [disable support for OpenGL ES 2.x API @<:@default=enabled@:>@])],
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    [enable_gles2="$enableval"],
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    [enable_gles2=yes])
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AC_ARG_ENABLE([dri],
    [AS_HELP_STRING([--enable-dri],
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        [enable DRI modules @<:@default=enabled@:>@])],
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    [enable_dri="$enableval"],
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    [enable_dri=yes])
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AC_ARG_ENABLE([gallium-extra-hud],
    [AS_HELP_STRING([--enable-gallium-extra-hud],
        [enable HUD block/NIC I/O HUD stats support @<:@default=disabled@:>@])],
    [enable_gallium_extra_hud="$enableval"],
    [enable_gallium_extra_hud=no])
AM_CONDITIONAL(HAVE_GALLIUM_EXTRA_HUD, test "x$enable_gallium_extra_hud" = xyes)
if test "x$enable_gallium_extra_hud" = xyes ; then
    DEFINES="${DEFINES} -DHAVE_GALLIUM_EXTRA_HUD=1"
fi

#TODO: no pkgconfig .pc available for libsensors.
#PKG_CHECK_MODULES([LIBSENSORS], [libsensors >= $LIBSENSORS_REQUIRED], [enable_lmsensors=yes], [enable_lmsensors=no])
AC_ARG_ENABLE([lmsensors],
    [AS_HELP_STRING([--enable-lmsensors],
        [enable HUD lmsensor support @<:@default=disabled@:>@])],
    [enable_lmsensors="$enableval"],
    [enable_lmsensors=no])
AM_CONDITIONAL(HAVE_LIBSENSORS, test "x$enable_lmsensors" = xyes)
if test "x$enable_lmsensors" = xyes ; then
    DEFINES="${DEFINES} -DHAVE_LIBSENSORS=1"
    LIBSENSORS_LDFLAGS="-lsensors"
else
    LIBSENSORS_LDFLAGS=""
fi
AC_SUBST(LIBSENSORS_LDFLAGS)

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case "$host_os" in
linux*)
    dri3_default=yes
    ;;
*)
    dri3_default=no
    ;;
esac
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if test "x$enable_dri" = xno; then
    dri3_default=no
fi

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AC_ARG_ENABLE([dri3],
    [AS_HELP_STRING([--enable-dri3],
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        [enable DRI3 @<:@default=auto@:>@])],
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    [enable_dri3="$enableval"],
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    [enable_dri3="$dri3_default"])
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AC_ARG_ENABLE([glx],
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    [AS_HELP_STRING([--enable-glx@<:@=dri|xlib|gallium-xlib@:>@],
        [enable the GLX library and choose an implementation @<:@default=auto@:>@])],
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    [enable_glx="$enableval"],
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    [enable_glx=yes])
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AC_ARG_ENABLE([osmesa],
    [AS_HELP_STRING([--enable-osmesa],
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        [enable OSMesa library @<:@default=disabled@:>@])],
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    [enable_osmesa="$enableval"],
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    [enable_osmesa=no])
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AC_ARG_ENABLE([gallium-osmesa],
    [AS_HELP_STRING([--enable-gallium-osmesa],
        [enable Gallium implementation of the OSMesa library @<:@default=disabled@:>@])],
    [enable_gallium_osmesa="$enableval"],
    [enable_gallium_osmesa=no])
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AC_ARG_ENABLE([egl],
    [AS_HELP_STRING([--disable-egl],
        [disable EGL library @<:@default=enabled@:>@])],
    [enable_egl="$enableval"],
    [enable_egl=yes])

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AC_ARG_ENABLE([xa],
    [AS_HELP_STRING([--enable-xa],
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        [enable build of the XA X Acceleration API @<:@default=disabled@:>@])],
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    [enable_xa="$enableval"],
    [enable_xa=no])
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AC_ARG_ENABLE([gbm],
   [AS_HELP_STRING([--enable-gbm],
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         [enable gbm library @<:@default=yes except cygwin@:>@])],
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   [enable_gbm="$enableval"],
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   [case "$host_os" in
       cygwin*)
          enable_gbm=no
          ;;
       *)
          enable_gbm=yes
          ;;
    esac])
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AC_ARG_ENABLE([nine],
    [AS_HELP_STRING([--enable-nine],
        [enable build of the nine Direct3D9 API @<:@default=no@:>@])],
    [enable_nine="$enableval"],
    [enable_nine=no])
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AC_ARG_ENABLE([xvmc],
   [AS_HELP_STRING([--enable-xvmc],
         [enable xvmc library @<:@default=auto@:>@])],
   [enable_xvmc="$enableval"],
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   [enable_xvmc=auto])
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AC_ARG_ENABLE([vdpau],
   [AS_HELP_STRING([--enable-vdpau],
         [enable vdpau library @<:@default=auto@:>@])],
   [enable_vdpau="$enableval"],
   [enable_vdpau=auto])
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AC_ARG_ENABLE([omx],
   [AS_HELP_STRING([--enable-omx],
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         [enable OpenMAX library @<:@default=disabled@:>@])],
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   [enable_omx="$enableval"],
   [enable_omx=no])
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AC_ARG_ENABLE([va],
   [AS_HELP_STRING([--enable-va],
         [enable va library @<:@default=auto@:>@])],
   [enable_va="$enableval"],
   [enable_va=auto])
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AC_ARG_ENABLE([opencl],
   [AS_HELP_STRING([--enable-opencl],
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         [enable OpenCL library @<:@default=disabled@:>@])],
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   [enable_opencl="$enableval"],
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   [enable_opencl=no])
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AC_ARG_ENABLE([opencl_icd],
   [AS_HELP_STRING([--enable-opencl-icd],
          [Build an OpenCL ICD library to be loaded by an ICD implementation
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           @<:@default=disabled@:>@])],
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    [enable_opencl_icd="$enableval"],
    [enable_opencl_icd=no])
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AC_ARG_ENABLE([gallium-tests],
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    [AS_HELP_STRING([--enable-gallium-tests],
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        [Enable optional Gallium tests) @<:@default=disabled@:>@])],
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    [enable_gallium_tests="$enableval"],
    [enable_gallium_tests=no])

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# Option for Gallium drivers
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# Keep this in sync with the --with-gallium-drivers help string default value
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GALLIUM_DRIVERS_DEFAULT="r300,r600,svga,swrast"
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AC_ARG_WITH([gallium-drivers],
    [AS_HELP_STRING([--with-gallium-drivers@<:@=DIRS...@:>@],
        [comma delimited Gallium drivers list, e.g.
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        "i915,ilo,nouveau,r300,r600,radeonsi,freedreno,svga,swrast,vc4,virgl,etnaviv,imx"
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        @<:@default=r300,r600,svga,swrast@:>@])],
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    [with_gallium_drivers="$withval"],
    [with_gallium_drivers="$GALLIUM_DRIVERS_DEFAULT"])
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# Doing '--without-gallium-drivers' will set this variable to 'no'.  Clear it
# here so that the script doesn't choke on an unknown driver name later.
case "$with_gallium_drivers" in
    yes) with_gallium_drivers="$GALLIUM_DRIVERS_DEFAULT" ;;
    no) with_gallium_drivers='' ;;
esac

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if test "x$enable_opengl" = xno -a \
        "x$enable_gles1" = xno -a \
        "x$enable_gles2" = xno -a \
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        "x$enable_nine" = xno -a \
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        "x$enable_xa" = xno -a \