9ba95f99f3
This restores commit r278330, with fixes for a few bot failures: - Fix a late change I had made to the save temps output file that I missed due to existing files sitting on my disk - Fix a bunch of Windows bot failures with "ambiguous call to overloaded function" due to confusion between llvm::make_unique vs std::make_unique (preface the new make_unique calls with "llvm::") - Attempt to fix a modules bot failure by adding a missing include to LTO/Config.h. Original change: Resolution-based LTO API. Summary: This introduces a resolution-based LTO API. The main advantage of this API over existing APIs is that it allows the linker to supply a resolution for each symbol in each object, rather than the combined object as a whole. This will become increasingly important for use cases such as ThinLTO which require us to process symbol resolutions in a more complicated way than just adjusting linkage. Patch by Peter Collingbourne. Reviewers: rafael, tejohnson, mehdi_amini Subscribers: lhames, tejohnson, mehdi_amini, llvm-commits Differential Revision: https://reviews.llvm.org/D20268 llvm-svn: 278338
34 lines
1.2 KiB
LLVM
34 lines
1.2 KiB
LLVM
; RUN: opt -module-summary %s -o %t.o
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; RUN: opt -module-summary %p/Inputs/thinlto_linkonceresolution.ll -o %t2.o
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; Ensure the plugin ensures that for ThinLTO the prevailing copy of a
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; linkonce symbol is changed to weak to ensure it is not eliminated.
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; Note that gold picks the first copy of f() as the prevailing one,
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; so listing %t2.o first is sufficient to ensure that this copy is
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; preempted. Also, set the import-instr-limit to 0 to prevent f() from
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; being imported from %t2.o which hides the problem.
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; RUN: %gold -m elf_x86_64 -plugin %llvmshlibdir/LLVMgold.so \
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; RUN: --plugin-opt=thinlto \
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; RUN: --plugin-opt=-import-instr-limit=0 \
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; RUN: --plugin-opt=save-temps \
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; RUN: -shared \
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; RUN: -o %t3.o %t2.o %t.o
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; RUN: llvm-nm %t3.o | FileCheck %s
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; RUN: llvm-dis %t.o.4.opt.bc -o - | FileCheck --check-prefix=OPT %s
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; RUN: llvm-dis %t2.o.4.opt.bc -o - | FileCheck --check-prefix=OPT2 %s
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; Ensure that f() is defined in resulting object file, and also
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; confirm the weak linkage directly in the saved opt bitcode files.
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; CHECK-NOT: U f
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; OPT-NOT: @f()
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; OPT2: define weak_odr hidden void @f()
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target triple = "x86_64-unknown-linux-gnu"
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define i32 @g() {
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call void @f()
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ret i32 0
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}
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define linkonce_odr hidden void @f() {
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ret void
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}
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