bpo-30923: Suppress fall-through warnings in libmpdec. (#2698)

diff --git a/setup.py b/setup.py
index 41aad8210d82672acc9a477fd62e86a4d0dc0fed..4f0f522bf8f06be7058796c187b9f48743995b9b 100644 (file)
--- a/setup.py
+++ b/setup.py
@@ -2119,6 +2119,9 @@ class PyBuildExt(build_ext):
         else:
             raise DistutilsError("_decimal: unsupported architecture")
 
+        if 'gcc' in cc: # Suppressing the warnings in the source is too verbose.
+            extra_compile_args.append('-Wno-implicit-fallthrough')
+
         # Workarounds for toolchain bugs:
         if sysconfig.get_config_var('HAVE_IPA_PURE_CONST_BUG'):
             # Some versions of gcc miscompile inline asm: