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Simon Marchi authored
My patch dwarf2read: Silence -Wenum-compare-switch warning 132448f8 made some parts of dwarf2read.c ignore warnings about switch using enums of different kinds. What I did not realize was that older Clang versions (prior to 6) did not have that warning, and therefore give this error: /home/emaisin/src/binutils-gdb/gdb/dwarf2read.c:24187:7: error: unknown warning group '-Wenum-compare-switch', ignored [-Werror,-Wunknown-pragmas] DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES ^ /home/emaisin/src/binutils-gdb/gdb/common/diagnostics.h:42:3: note: expanded from macro 'DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES' DIAGNOSTIC_IGNORE ("-Wenum-compare-switch") ^ /home/emaisin/src/binutils-gdb/gdb/common/diagnostics.h:27:3: note: expanded from macro 'DIAGNOSTIC_IGNORE' _Pragma (STRINGIFY (GCC diagnostic ignored option)) ^ <scratch space>:10:25: note: expanded from here GCC diagnostic ignored "-Wenum-compare-switch" ^ Clang has a way to test if it knows about a particular warning. This patch uses that feature to only define DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES to something if the warning is recognized by the Clang version being used. I tested building dwarf2read.c with clang 4, 5, 6, as well as gcc. gdb/ChangeLog: * common/diagnostics.h (DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES): Only define if the compiler knows about -Wenum-compare-switch.
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