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If foo is referenced in any object file, bitcode file or shared object, `__wrap_foo` should be retained as the redirection target of sym (f96ff3c0f8ebd941b3f6b345164c3d858b781484). If the object file defining foo has foo references, we cannot easily distinguish the case from cases where foo is not referenced (we haven't scanned relocations). Retain `__wrap_foo` because we choose to wrap sym references regardless of whether sym is defined to keep non-LTO/LTO/relocatable links' behaviors similar https://sourceware.org/bugzilla/show_bug.cgi?id=26358 . If foo is defined in a shared object, `__wrap_foo` can still be omitted (`wrap-dynamic-undef.s`). Reviewed By: andrewng Differential Revision: https://reviews.llvm.org/D95152
34 lines
1.0 KiB
ArmAsm
34 lines
1.0 KiB
ArmAsm
# REQUIRES: x86
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# RUN: rm -rf %t && split-file %s %t
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# RUN: llvm-mc -filetype=obj -triple=x86_64 %t/main.s -o %t/main.o
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# RUN: llvm-mc -filetype=obj -triple=x86_64 %t/wrap.s -o %t/wrap.o
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# RUN: ld.lld -shared --soname=fixed %t/wrap.o -o %t/wrap.so
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## GNU ld does not wrap a defined symbol in an object file
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## https://sourceware.org/bugzilla/show_bug.cgi?id=26358
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## We choose to wrap defined symbols so that LTO, non-LTO and relocatable links
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## behave the same. The 'call bar' in main.o will reference __wrap_bar. We cannot
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## easily distinguish the case from cases where bar is not referenced, so we
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## export __wrap_bar whenever bar is defined, regardless of whether it is indeed
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## referenced.
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# RUN: ld.lld -shared %t/main.o --wrap bar -o %t1.so
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# RUN: llvm-objdump -d %t1.so | FileCheck %s
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# RUN: ld.lld %t/main.o %t/wrap.so --wrap bar -o %t1
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# RUN: llvm-objdump -d %t1 | FileCheck %s
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# CHECK: <_start>:
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# CHECK-NEXT: callq {{.*}} <__wrap_bar@plt>
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#--- main.s
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.globl _start, bar
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_start:
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call bar
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bar:
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#--- wrap.s
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.globl __wrap_bar
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__wrap_bar:
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retq
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