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llvm-project/lld/test/ELF/lto/undef-weak-lazy.ll

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[ELF] Set `referenced` bit of Undefined created by BitcodeFile D64136 and D65584, while fixing STB_WEAK issues and improving our compatibility with ld.bfd, can cause another STB_WEAK problem related to LTO: If %tundef.o has an undefined reference on f, and %tweakundef.o has a weak undefined reference on f, %tdef.o has a definition of f ``` ld.lld %tundef.o %tweakundef.o --start-lib %tdef.o --end-lib ``` 1) `%tundef.o` doesn't set the `referenced` bit. 2) `%weakundef.o` changes the binding from STB_GLOBAL to STB_WEAK 3) `%tdef.o` is not fetched because the binding is weak. Step (1) is incorrect. This patch sets the `referenced` bit of Undefined created by bitcode files. Reviewed By: ruiu Differential Revision: https://reviews.llvm.org/D66992 llvm-svn: 370437
2019-08-30 15:10:30 +08:00
; REQUIRES: x86
; RUN: llvm-as %S/Inputs/undef.ll -o %tundef.o
; RUN: llvm-as %s -o %tweakundef.o
; RUN: llvm-as %S/Inputs/archive-3.ll -o %tdef.o
;; Test that the lazy bitcode %tdef.o is fetched.
; RUN: ld.lld %tundef.o --start-lib %tdef.o --end-lib -shared -o %t.so
; RUN: llvm-nm %t.so | FileCheck %s
;; Test %tweakundef.o does not change STB_GLOBAL to STB_WEAK.
; RUN: ld.lld %tundef.o %tweakundef.o --start-lib %tdef.o --end-lib -shared -o %t.so
; RUN: llvm-nm %t.so | FileCheck %s
;; %tweakundef.o does not fetch %tdef.o but %tundef.o does.
; RUN: ld.lld --start-lib %tdef.o --end-lib %tweakundef.o %tundef.o -shared -o %t.so
; RUN: llvm-nm %t.so | FileCheck %s
; CHECK: T foo
target triple = "x86_64-unknown-linux-gnu"
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
declare extern_weak void @foo()