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Summary: For symbols that has linkonce_odr linkage and unnamed_addr, it can be auto hide by linker to avoid weak external symbols. Teach ThinLTO to perform auto hide so it can safely promote linkonce_odr to weak symbols without breaking this nice property. Reviewers: tejohnson, mehdi_amini Reviewed By: tejohnson Subscribers: inglorion, eraman, rnk, pcc, llvm-commits Differential Revision: https://reviews.llvm.org/D43130 llvm-svn: 324757
32 lines
1.3 KiB
LLVM
32 lines
1.3 KiB
LLVM
; This test ensures that we drop the preempted copy of @f from %t2.bc from its
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; comdat after making it available_externally. If not we would get a
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; verification error.
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; RUN: opt -module-summary %s -o %t1.bc
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; RUN: opt -module-summary %p/Inputs/linkonce_resolution_comdat.ll -o %t2.bc
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; RUN: llvm-lto -thinlto-action=run %t1.bc %t2.bc -exported-symbol=f -exported-symbol=g -thinlto-save-temps=%t3.
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; RUN: llvm-dis %t3.0.3.imported.bc -o - | FileCheck %s --check-prefix=IMPORT1
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; RUN: llvm-dis %t3.1.3.imported.bc -o - | FileCheck %s --check-prefix=IMPORT2
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; Copy from first module is prevailing and converted to weak_odr, copy
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; from second module is preempted and converted to available_externally and
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; removed from comdat.
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; IMPORT1: define weak_odr hidden i32 @f(i8*) unnamed_addr comdat($c1) {
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; IMPORT2: define available_externally i32 @f(i8*) unnamed_addr {
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; RUN: llvm-nm -o - < %t1.bc.thinlto.o | FileCheck %s --check-prefix=NM1
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; NM1: W f
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; RUN: llvm-nm -o - < %t2.bc.thinlto.o | FileCheck %s --check-prefix=NM2
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; f() would have been turned into available_externally since it is preempted,
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; and inlined into g()
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; NM2-NOT: f
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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$c1 = comdat any
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define linkonce_odr i32 @f(i8*) unnamed_addr comdat($c1) {
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ret i32 43
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}
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