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Add CommonLinkage; currently tentative definitions

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are represented as "weak", but there are subtle differences
in some cases on Darwin, so we need both.  The intent
is that "common" will behave identically to "weak" unless
somebody changes their target to do something else.
No functional change as yet.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51118 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dale Johannesen
2008-05-14 20:12:51 +00:00
parent 5087124721
commit aafce77b17
22 changed files with 70 additions and 31 deletions
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5
lib/CodeGen/ELFWriter.cpp
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@ -282,7 +282,8 @@ void ELFWriter::EmitGlobal(GlobalVariable *GV) {
// If this global is part of the common block, add it now. Variables are
// part of the common block if they are zero initialized and allowed to be
// merged with other symbols.
if (GV->hasLinkOnceLinkage() || GV->hasWeakLinkage()) {
if (GV->hasLinkOnceLinkage() || GV->hasWeakLinkage() ||
GV->hasCommonLinkage()) {
ELFSym CommonSym(GV);
// Value for common symbols is the alignment required.
CommonSym.Value = Align;
@ -313,7 +314,7 @@ void ELFWriter::EmitGlobal(GlobalVariable *GV) {
BSSSym.SetType(ELFSym::STT_OBJECT);
switch (GV->getLinkage()) {
default: // weak/linkonce handled above
default: // weak/linkonce/common handled above
assert(0 && "Unexpected linkage type!");
case GlobalValue::AppendingLinkage: // FIXME: This should be improved!
case GlobalValue::ExternalLinkage: