Add the INTERFACE_SYSTEM_INCLUDE_DIRECTORIES target property.

Unlike other target properties, this does not have a corresponding
non-INTERFACE variant.

This allows propagation of system attribute on include directories
from link dependents.

1 files changed, 8 insertions, 0 deletions

diff --git a/Source/cmGeneratorExpressionDAGChecker.cxx b/Source/cmGeneratorExpressionDAGChecker.cxx
index 5b79e35..d04e195 100644
--- a/Source/cmGeneratorExpressionDAGChecker.cxx
+++ b/Source/cmGeneratorExpressionDAGChecker.cxx
@@ -172,6 +172,14 @@ bool cmGeneratorExpressionDAGChecker::EvaluatingIncludeDirectories() const
 }
 
 //----------------------------------------------------------------------------
+bool
+cmGeneratorExpressionDAGChecker::EvaluatingSystemIncludeDirectories() const
+{
+  const char *prop = this->Property.c_str();
+  return strcmp(prop, "INTERFACE_SYSTEM_INCLUDE_DIRECTORIES") == 0;
+}
+
+//----------------------------------------------------------------------------
 bool cmGeneratorExpressionDAGChecker::EvaluatingCompileDefinitions() const
 {
   const char *prop = this->Property.c_str();