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-rw-r--r--build/root.build3
1 files changed, 2 insertions, 1 deletions
diff --git a/build/root.build b/build/root.build
index cfbcda9..9f670f8 100644
--- a/build/root.build
+++ b/build/root.build
@@ -6,7 +6,8 @@ cxx.std = experimental
using cxx
-#assert $cxx.features.modules 'c++ compiler does not support modules'
+if! $cxx.features.modules
+ warn 'c++ compiler does not support modules'
mxx{*}: extension = mxx
cxx{*}: extension = cxx