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+++ b/docs/users_guide/codegens.rst
@@ -76,6 +76,13 @@ C Code Generator (``-fvia-C``)
single: C code generator
single: -fvia-C
+.. ghc-flag:: -fvia-C
+ :shortdesc: use the C code generator
+ :type: dynamic
+ :category: warnings
+
+ Use the C code generator. Only supposed in unregisterised GHC builds.
+
This is the oldest code generator in GHC and is generally not included
any more having been deprecated around GHC 7.0. Select it with the
:ghc-flag:`-fvia-C` flag.