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Explicitly initialize a flag in a default constructor.

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Works around a Visual C++ issue.

Patch by Douglas Yung!



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@228699 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Paul Robinson 2015-02-10 15:30:02 +00:00
parent cec93b661d
commit a932cb6d09
2 changed files with 53 additions and 0 deletions
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2
include/llvm/CodeGen/TargetLoweringObjectFileImpl.h
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@ -36,6 +36,8 @@ class TargetLoweringObjectFileELF : public TargetLoweringObjectFile {
bool UseInitArray;
public:
TargetLoweringObjectFileELF() : UseInitArray(false) {}
virtual ~TargetLoweringObjectFileELF() {}
void emitPersonalityValue(MCStreamer &Streamer, const TargetMachine &TM,

51
test/CodeGen/X86/init-priority.ll Normal file
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@ -0,0 +1,51 @@
; RUN: llc < %s -mtriple=x86_64-unknown-freebsd9 | FileCheck %s
; Check that our compiler never emits global constructors
; inside the .init_array section when building for a non-Linux ELF target.
; Because of this, the test depends on UseInitArray behavior under FreeBSD
; as found in Generic_ELF::addClangTargetOptions().
; This is to workaround a Visual Studio bug which causes field
; UseInitArray to be left uninitialized instead of being
; zero-initialized (as specified in [dcl.init]p7).
; This workaround consists in providing a user default constructor
; that explicitly initializes field UseInitArray.
%class.C = type { i8 }
%class.D = type { i8 }
@c1 = global %class.C zeroinitializer, align 1
@d1 = global %class.D zeroinitializer, align 1
@llvm.global_ctors = appending global [2 x { i32, void ()* }] [{ i32, void ()* } { i32 101, void ()* @_GLOBAL__I_000101 }, { i32, void ()* } { i32 65535, void ()* @_GLOBAL__I_a }]
define linkonce_odr void @_ZN1CC1Ev(%class.C* nocapture %this) {
entry:
ret void
}
define linkonce_odr void @_ZN1DC1Ev(%class.D* nocapture %this) {
entry:
ret void
}
define linkonce_odr void @_ZN1DC2Ev(%class.D* nocapture %this) {
entry:
ret void
}
define linkonce_odr void @_ZN1CC2Ev(%class.C* nocapture %this) {
entry:
ret void
}
define internal void @_GLOBAL__I_000101() nounwind readnone {
entry:
ret void
}
define internal void @_GLOBAL__I_a() nounwind readnone {
entry:
ret void
}
; CHECK-NOT: .init_array