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primiano authored
Reason for reland: Fix empty gyp target edge case, that caused the breakage. Original CL: http://crrev.com/1584893002 Revert CL: http://crrev.com/1610673002 Breakage: https://build.chromium.org/p/chromium.mac/builders/iOS_Device/builds/35574 Original CL description: > A smaller, yet key, step to move > > From: a situation where mainly executables (but not really) depend on > allocator, and base needs dependencies (to tcmalloc) to be injected > from content (which violates the ODR in component buids). > > To: a situation where only base depends on allocator and the other > targets get recursively the required linked flags. > > In essence this CL is a more gradual approach to the bigger > unreviewable crrev.com/1528013002. > > How is the transition handled? > ------------------------------ > After this CL, the situation will be as follows: > From a build time perspective base will also depend on allocator. > This will not change anything substantial in static builds and introduce > yet another (temporary) ODR violation in Linux component builds. > The big change introduced by this CL is the fact that all the executable > targets that depend on base (virtualy all) will also get another > indirect dependency to allocator. > > In other words, after this CL executable targets will depend on > allocator for two reasons: > - Because they have an explicit dependency to it (the one I am going to > get rid of in the immediate future). > - Because this new transitive path I am introducing in base. > > Rationale of this approach > -------------------------- > This allows to restrict the critical changes in a smaller CL easier to > review, at the cost of the temporary double dependency on base. > The good things are: > - If something will break, this CL will be very easy to revert. > - The next cleanups will be straightforward. > - We have now smoke tests (crrev.com/1577883002) that will help us > realize if something goes wrong. > > Next steps > ---------- > In the next CLs I will: > - Remove the content -> base injection layer, and let base directly use > the tcmalloc functions it needs. > - Remove all the traces of USE_TCMALLOC outside of base. > - Start cleaning up the hundreds use_allocator conditionals in the gyp > files in a way which is easier to review and produce zero ninja diffs > (see crrev.com/1583973002 as an example) > > Ninja diffs caused by this change > --------------------------------- > ### Win, static build, GN: https://paste.ee/p/hvcRp > The missing targets (mostly tests) that previously were > not depending on allocator, now get that by virtue of the transitive > dependency. > > ### Win, static build, GYP: https://paste.ee/p/AGuKR > As above. Just GYP seems to emit the ninja files in a different, > inlined, format. > > ### linux static build, GYP: https://paste.ee/p/kmD7U > As above. Plus the new targets also get the -Wl,-u (keep symbol) > args as expected by allocator.gyp for the tcmalloc heap profiler. > > ### linux shared build, GYP: https://paste.ee/p/FHHNR > Nothing relevant. Just I moved the dependency to allocator from > base_unittests to base, and that is the only thing that reflects in the > ninja files. > > BUG=564618 TBR=wfh@chromium.org,brettw@chromium.org BUG=564618 Review URL: https://codereview.chromium.org/1605023004 Cr-Commit-Position: refs/heads/master@{#370438}
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