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[LTO] Fix the issue of resetting the triple to default when it's empty #157829

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Merged
merged 5 commits into from
Sep 11, 2025
Merged

[LTO] Fix the issue of resetting the triple to default when it's empty #157829

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2741488
[LTO] Fix the issue of setting default triple when the triple is empty.
fzou1 Sep 10, 2025
5b49185
Add test
fzou1 Sep 10, 2025
68c1a95
Update test and rewrite to avoid constructing Triple from empty string
fzou1 Sep 11, 2025
036b628
Update test to check valid output
fzou1 Sep 11, 2025
e0ff115
Merge branch 'main' into lto_empty_triple
fzou1 Sep 11, 2025
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4 changes: 2 additions & 2 deletions llvm/lib/LTO/LTOCodeGenerator.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -376,11 +376,11 @@ bool LTOCodeGenerator::determineTarget() {
return true;

TripleStr = MergedModule->getTargetTriple().str();
llvm::Triple Triple(TripleStr);
if (TripleStr.empty()) {
TripleStr = sys::getDefaultTargetTriple();
MergedModule->setTargetTriple(Triple);
MergedModule->setTargetTriple(Triple(TripleStr));
}
llvm::Triple Triple(TripleStr);

// create target machine from info for merged modules
std::string ErrMsg;
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12 changes: 12 additions & 0 deletions llvm/test/LTO/empty-triple.ll
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@@ -0,0 +1,12 @@
; RUN: llvm-as < %s >%t1
; RUN: llvm-lto -exported-symbol=main -filetype=asm -o - %t1 2>&1 | FileCheck %s

; The test is to check the triple is set to default one when it's empty.
; Otherwise, an error will be raised by llvm-lto.

; CHECK-LABEL: main
; CHECK-NOT: error
define void @main() {
entry:
ret void
}