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Make sure the const bit gets inherited correctly when linking declarations
of disagreeing constness. This fixes test/Regression/Linker/ConstantGlobals[123].ll git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16692 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -457,15 +457,26 @@ static bool LinkGlobals(Module *Dest, const Module *Src,
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// external globals, we aren't adding anything.
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ValueMap.insert(std::make_pair(SGV, DGV));
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// Inherit 'const' information.
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if (SGV->isConstant()) DGV->setConstant(true);
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} else if (DGV->isExternal()) { // If DGV is external but SGV is not...
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ValueMap.insert(std::make_pair(SGV, DGV));
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DGV->setLinkage(SGV->getLinkage()); // Inherit linkage!
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if (DGV->isConstant() && !SGV->isConstant())
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return Error(Err, "Linking globals named '" + SGV->getName() +
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"': declaration is const but definition is not!");
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// Inherit 'const' information.
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if (SGV->isConstant()) DGV->setConstant(true);
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} else if (SGV->hasWeakLinkage() || SGV->hasLinkOnceLinkage()) {
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// At this point we know that DGV has LinkOnce, Appending, Weak, or
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// External linkage. If DGV is Appending, this is an error.
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if (DGV->hasAppendingLinkage())
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return Error(Err, "Linking globals named '" + SGV->getName() +
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" ' with 'weak' and 'appending' linkage is not allowed!");
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"' with 'weak' and 'appending' linkage is not allowed!");
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if (SGV->isConstant() != DGV->isConstant())
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return Error(Err, "Global Variable Collision on '" +
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@ -498,6 +509,9 @@ static bool LinkGlobals(Module *Dest, const Module *Src,
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} else if (SGV->getLinkage() != DGV->getLinkage()) {
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return Error(Err, "Global variables named '" + SGV->getName() +
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"' have different linkage specifiers!");
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// Inherit 'const' information.
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if (SGV->isConstant()) DGV->setConstant(true);
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} else if (SGV->hasExternalLinkage()) {
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// Allow linking two exactly identical external global variables...
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if (SGV->isConstant() != DGV->isConstant())
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@ -457,15 +457,26 @@ static bool LinkGlobals(Module *Dest, const Module *Src,
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// external globals, we aren't adding anything.
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ValueMap.insert(std::make_pair(SGV, DGV));
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// Inherit 'const' information.
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if (SGV->isConstant()) DGV->setConstant(true);
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} else if (DGV->isExternal()) { // If DGV is external but SGV is not...
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ValueMap.insert(std::make_pair(SGV, DGV));
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DGV->setLinkage(SGV->getLinkage()); // Inherit linkage!
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if (DGV->isConstant() && !SGV->isConstant())
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return Error(Err, "Linking globals named '" + SGV->getName() +
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"': declaration is const but definition is not!");
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// Inherit 'const' information.
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if (SGV->isConstant()) DGV->setConstant(true);
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} else if (SGV->hasWeakLinkage() || SGV->hasLinkOnceLinkage()) {
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// At this point we know that DGV has LinkOnce, Appending, Weak, or
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// External linkage. If DGV is Appending, this is an error.
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if (DGV->hasAppendingLinkage())
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return Error(Err, "Linking globals named '" + SGV->getName() +
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" ' with 'weak' and 'appending' linkage is not allowed!");
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"' with 'weak' and 'appending' linkage is not allowed!");
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if (SGV->isConstant() != DGV->isConstant())
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return Error(Err, "Global Variable Collision on '" +
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@ -498,6 +509,9 @@ static bool LinkGlobals(Module *Dest, const Module *Src,
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} else if (SGV->getLinkage() != DGV->getLinkage()) {
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return Error(Err, "Global variables named '" + SGV->getName() +
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"' have different linkage specifiers!");
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// Inherit 'const' information.
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if (SGV->isConstant()) DGV->setConstant(true);
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} else if (SGV->hasExternalLinkage()) {
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// Allow linking two exactly identical external global variables...
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if (SGV->isConstant() != DGV->isConstant())
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