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5e5633cf8a
If the linker requested to preserve a linkonce function, we should honor this even if we drop all uses. We explicitely avoid turning them into weak_odr (unlike the first version of this patch in r267644), because the codegen can be different on Darwin: because of `llvm::canBeOmittedFromSymbolTable()` we may emit the symbol as weak_def_can_be_hidden instead of weak_definition. From: Mehdi Amini <mehdi.amini@apple.com> llvm-svn: 268607
38 lines
1.3 KiB
LLVM
38 lines
1.3 KiB
LLVM
; RUN: llvm-as %s -o %t.o
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; RUN: %ld64 -lto_library %llvmshlibdir/libLTO.dylib -dylib -arch x86_64 -macosx_version_min 10.10.0 -lSystem -o %t.dylib %t.o -save-temps -undefined dynamic_lookup -exported_symbol _c -exported_symbol _b -exported_symbol _GlobLinkonce
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; RUN: llvm-dis %t.dylib.lto.opt.bc -o - | FileCheck --check-prefix=IR %s
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; check that @a is no longer a linkonce_odr definition
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; IR-NOT: define linkonce_odr void @a()
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; check that @b is appended in llvm.used
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; IR: @llvm.compiler.used = appending global [2 x i8*] [i8* bitcast ([1 x i8*]* @GlobLinkonce to i8*), i8* bitcast (void ()* @b to i8*)], section "llvm.metadata"
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; RUN: llvm-nm %t.dylib | FileCheck --check-prefix=NM %s
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; check that the linker can hide @a but not @b, nor @GlobLinkonce
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; NM: 0000000000000f48 S _GlobLinkonce
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; NM: 0000000000000f10 t _a
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; NM: 0000000000000f20 T _b
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; NM: 0000000000000f00 T _c
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target triple = "x86_64-apple-macosx10.10.0"
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declare void @external()
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@GlobLinkonce = linkonce_odr unnamed_addr constant [1 x i8*] [i8* null], align 8
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define linkonce_odr void @a() noinline {
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%use_of_GlobLinkonce = load [1 x i8*], [1 x i8*] *@GlobLinkonce
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call void @external()
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ret void
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}
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define linkonce_odr void @b() {
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ret void
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}
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define void()* @c() {
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call void @a()
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ret void()* @b
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}
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