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b4143d5d72
Non-prevailing weak/linkonce odr symbols will be dropped by ThinLTO to available_externally when possible. If they had an initializer in the global_ctors list, a comdat group was being created. This code already had logic to skip available_externally defs, but now the EliminateAvailableExternally pass will drop these symbols to declarations earlier. Change the check to skip all declarations for linker (which includes available_externally along with declarations). Reviewers: mehdi_amini Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D28737 llvm-svn: 292408
20 lines
813 B
LLVM
20 lines
813 B
LLVM
; Test to ensure that a global value that was dropped to a declaration
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; (e.g. ThinLTO will drop non-prevailing weak to declarations) does not
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; provoke creation of a comdat when it had an initializer.
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; RUN: llc -mtriple x86_64-unknown-linux-gnu < %s | FileCheck %s
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; CHECK-NOT: comdat
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; ModuleID = 'dropped_constructor.o'
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source_filename = "dropped_constructor.c"
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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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@fv = external global i8, align 8
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@llvm.global_ctors = appending global [1 x { i32, void ()*, i8* }] [{ i32, void ()*, i8* } { i32 65535, void ()* @__cxx_global_var_init.33, i8* @fv }]
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; Function Attrs: norecurse nounwind
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define internal void @__cxx_global_var_init.33() section ".text.startup" {
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store i8 1, i8* @fv, align 8
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ret void
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}
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