Teresa Johnson 37b80122bd [ThinLTO] Auto-hide prevailing linkonce_odr only when all copies eligible ... Summary: We hit undefined references building with ThinLTO when one source file contained explicit instantiations of a template method (weak_odr) but there were also implicit instantiations in another file (linkonce_odr), and the latter was the prevailing copy. In this case the symbol was marked hidden when the prevailing linkonce_odr copy was promoted to weak_odr. It led to unsats when the resulting shared library was linked with other code that contained a reference (expecting to be resolved due to the explicit instantiation). Add a CanAutoHide flag to the GV summary to allow the thin link to identify when all copies are eligible for auto-hiding (because they were all originally linkonce_odr global unnamed addr), and only do the auto-hide in that case. Most of the changes here are due to plumbing the new flag through the bitcode and llvm assembly, and resulting test changes. I augmented the existing auto-hide test to check for this situation. Reviewers: pcc Subscribers: mehdi_amini, inglorion, eraman, dexonsmith, arphaman, dang, llvm-commits, steven_wu, wmi Tags: #llvm Differential Revision: https://reviews.llvm.org/D59709 llvm-svn: 360466		2019-05-10 20:08:24 +00:00
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CMakeLists.txt	[ThinLTO] Compute synthetic function entry count	2018-12-13 19:54:27 +00:00
Caching.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
LLVMBuild.txt	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
LTO.cpp	[ThinLTO] Auto-hide prevailing linkonce_odr only when all copies eligible	2019-05-10 20:08:24 +00:00
LTOBackend.cpp	[NewPassManager] Adding pass tuning options: loop vectorize.	2019-04-19 16:11:59 +00:00
LTOCodeGenerator.cpp	[LTO] Add plumbing to save stats during LTO on Darwin.	2019-04-19 12:36:41 +00:00
LTOModule.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
SummaryBasedOptimizations.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
ThinLTOCodeGenerator.cpp	[ThinLTO] Auto-hide prevailing linkonce_odr only when all copies eligible	2019-05-10 20:08:24 +00:00
UpdateCompilerUsed.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00