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[msan] Change linkage type of __msan_track_origins. 

LinkOnceODRLinkage globals may be removed in GlobalOpt if not used in the
current module.

llvm-svn: 169377
This commit is contained in:
Evgeniy Stepanov 2012-12-05 12:49:41 +00:00
parent c446aa039a
commit 474cb3b3b5
2 changed files with 4 additions and 1 deletions
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2
llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
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@ -244,7 +244,7 @@ bool MemorySanitizer::doInitialization(Module &M) {
appendToGlobalCtors(M, cast<Function>(M.getOrInsertFunction(
"__msan_init", IRB.getVoidTy(), NULL)), 0);
new GlobalVariable(M, IRB.getInt32Ty(), true, GlobalValue::LinkOnceODRLinkage,
new GlobalVariable(M, IRB.getInt32Ty(), true, GlobalValue::WeakODRLinkage,
IRB.getInt32(ClTrackOrigins), "__msan_track_origins");
// Create the callback.

3
llvm/test/Instrumentation/MemorySanitizer/msan_basic.ll
View File

@ -4,6 +4,9 @@ target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f3
; Check the presence of __msan_init
; CHECK: @llvm.global_ctors {{.*}} @__msan_init
; Check the presence and the linkage type of __msan_track_origins
; CHECK: @__msan_track_origins = weak_odr constant i32 0
; load followed by cmp: check that we load the shadow and call __msan_warning.
define void @LoadAndCmp(i32* nocapture %a) nounwind uwtable {
entry: