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genex: Add TARGET_NAME_IF_EXISTS expression

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Define `$<TARGET_NAME_IF_EXISTS:tgt>` to mean `tgt` if the target
exists and otherwise an empty string.
This commit is contained in:
Alex Turbov
2018-03-27 04:57:44 +03:00
committed by Brad King
parent 6792c7787a
commit 7b173a2933
14 changed files with 87 additions and 0 deletions
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Source/cmGeneratorExpressionNode.cxx
+35
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@@ -331,6 +331,40 @@ static const struct TargetExistsNode : public cmGeneratorExpressionNode
}
} targetExistsNode;
static const struct TargetNameIfExistsNode : public cmGeneratorExpressionNode
{
TargetNameIfExistsNode() {}
int NumExpectedParameters() const override { return 1; }
std::string Evaluate(
const std::vector<std::string>& parameters,
cmGeneratorExpressionContext* context,
const GeneratorExpressionContent* content,
cmGeneratorExpressionDAGChecker* /*dagChecker*/) const override
{
if (parameters.size() != 1) {
reportError(context, content->GetOriginalExpression(),
"$<TARGET_NAME_IF_EXISTS:...> expression requires one "
"parameter");
return std::string();
}
std::string targetName = parameters.front();
if (targetName.empty() ||
!cmGeneratorExpression::IsValidTargetName(targetName)) {
reportError(context, content->GetOriginalExpression(),
"$<TARGET_NAME_IF_EXISTS:tgt> expression requires a "
"non-empty valid target name.");
return std::string();
}
return context->LG->GetMakefile()->FindTargetToUse(targetName)
? targetName
: std::string();
}
} targetNameIfExistsNode;
static const struct LowerCaseNode : public cmGeneratorExpressionNode
{
LowerCaseNode() {}
@@ -1897,6 +1931,7 @@ const cmGeneratorExpressionNode* cmGeneratorExpressionNode::GetNode(
nodeMap["TARGET_OBJECTS"] = &targetObjectsNode;
nodeMap["TARGET_POLICY"] = &targetPolicyNode;
nodeMap["TARGET_EXISTS"] = &targetExistsNode;
nodeMap["TARGET_NAME_IF_EXISTS"] = &targetNameIfExistsNode;
nodeMap["BUILD_INTERFACE"] = &buildInterfaceNode;
nodeMap["INSTALL_INTERFACE"] = &installInterfaceNode;
nodeMap["INSTALL_PREFIX"] = &installPrefixNode;