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-rw-r--r--Source/cmMakefile.cxx4
1 files changed, 4 insertions, 0 deletions
diff --git a/Source/cmMakefile.cxx b/Source/cmMakefile.cxx
index ae9b362..e945b17 100644
--- a/Source/cmMakefile.cxx
+++ b/Source/cmMakefile.cxx
@@ -547,6 +547,10 @@ void cmMakefile::AddIncludeDirectory(const char* inc, bool before)
void cmMakefile::AddDefinition(const char* name, const char* value)
{
+ if (!value )
+ {
+ return;
+ }
m_Definitions.erase( DefinitionMap::key_type(name));
m_Definitions.insert(DefinitionMap::value_type(name, value));
}