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-rw-r--r--Source/cmMakefile.cxx2
1 files changed, 1 insertions, 1 deletions
diff --git a/Source/cmMakefile.cxx b/Source/cmMakefile.cxx
index e156625..40a67a3 100644
--- a/Source/cmMakefile.cxx
+++ b/Source/cmMakefile.cxx
@@ -1222,7 +1222,7 @@ void cmMakefile::AddCustomCommandOldStyle(
// Each output must get its own copy of this rule.
cmsys::RegularExpression sourceFiles(
- "\\.(C|M|c|c\\+\\+|cc|cpp|cxx|mpp|cu|m|mm|"
+ "\\.(C|M|c|c\\+\\+|cc|cpp|cxx|mpp|ixx|cppm|cu|m|mm|"
"rc|def|r|odl|idl|hpj|bat|h|h\\+\\+|"
"hm|hpp|hxx|in|txx|inl)$");