bpo-30923: Disable warning that has been part of -Wextra since gcc-7.0. (#3142)

diff --git a/Modules/_decimal/libmpdec/io.c b/Modules/_decimal/libmpdec/io.c
index 3aadfb0437979ce9fcb45a5362ab957c6c39f665..f45e558f1a9573448a9e4b9d73505cca7bb4d998 100644 (file)
--- a/Modules/_decimal/libmpdec/io.c
+++ b/Modules/_decimal/libmpdec/io.c
@@ -45,6 +45,12 @@
    PEP-3101 formatting for numeric types. */
 
 
+/* Disable warning that is part of -Wextra since gcc 7.0. */
+#if defined(__GNUC__) && !defined(__INTEL_COMPILER) && __GNUC__ >= 7
+  #pragma GCC diagnostic ignored "-Wimplicit-fallthrough"
+#endif
+
+
 /*
  * Work around the behavior of tolower() and strcasecmp() in certain
  * locales. For example, in tr_TR.utf8: