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d41ca54775
dso_local leads to direct access even if the definition is not within this compilation unit (it is still in the same linkage unit). On ELF, such a relocation (e.g. R_X86_64_PC32) referencing a STB_GLOBAL STV_DEFAULT object can cause a linker error in a -shared link. If the linkage is changed to available_externally, the dso_local flag should be dropped, so that no direct access will be generated. The current behavior is benign, because -fpic does not assume dso_local (clang/lib/CodeGen/CodeGenModule.cpp:shouldAssumeDSOLocal). If we do that for -fno-semantic-interposition (D73865), there will be an R_X86_64_PC32 linker error without this patch. Reviewed By: tejohnson Differential Revision: https://reviews.llvm.org/D74751
31 lines
841 B
LLVM
31 lines
841 B
LLVM
; RUN: opt -thinlto-bc -thinlto-split-lto-unit -o %t0.bc %s
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; RUN: llvm-lto2 run -r %t0.bc,__imp_f,l \
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; RUN: -r %t0.bc,g,p \
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; RUN: -r %t0.bc,g,l \
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; RUN: -r %t0.bc,e,l \
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; RUN: -r %t0.bc,main,x \
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; RUN: -save-temps -o %t1 %t0.bc
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; RUN: llvm-dis %t1.1.3.import.bc -o - | FileCheck %s
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source_filename = "test.cpp"
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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$g = comdat any
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@g = global i8 42, comdat, !type !0
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; CHECK: define available_externally dllimport i8* @f()
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define available_externally dllimport i8* @f() {
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ret i8* @g
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}
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define i8* @e() {
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ret i8* @g
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}
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define i32 @main() {
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%1 = call i8* @f()
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%2 = ptrtoint i8* %1 to i32
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ret i32 %2
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}
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!0 = !{i32 0, !"typeid"}
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