Genex: Per-source $<COMPILE_LANGUAGE:...> support

Fixes: #17542

1 files changed, 16 insertions, 0 deletions

diff --git a/Source/cmGeneratorExpression.cxx b/Source/cmGeneratorExpression.cxx
index 86991c1c59..6979b38882 100644
--- a/Source/cmGeneratorExpression.cxx
+++ b/Source/cmGeneratorExpression.cxx
@@ -9,6 +9,7 @@
 #include "assert.h"
 #include "cmAlgorithms.h"
 #include "cmGeneratorExpressionContext.h"
+#include "cmGeneratorExpressionDAGChecker.h"
 #include "cmGeneratorExpressionEvaluator.h"
 #include "cmGeneratorExpressionLexer.h"
 #include "cmGeneratorExpressionParser.h"
@@ -385,3 +386,18 @@ void cmCompiledGeneratorExpression::GetMaxLanguageStandard(
     mapping = it->second;
   }
 }
+
+const char* cmGeneratorExpressionInterpreter::Evaluate(
+  const char* expression, const std::string& property)
+{
+  if (this->Target.empty()) {
+    return this->EvaluateExpression(expression);
+  }
+
+  // Specify COMPILE_OPTIONS to DAGchecker, same semantic as COMPILE_FLAGS
+  cmGeneratorExpressionDAGChecker dagChecker(
+    this->Target, property == "COMPILE_FLAGS" ? "COMPILE_OPTIONS" : property,
+    nullptr, nullptr);
+
+  return this->EvaluateExpression(expression, &dagChecker);
+}