Fix setup.py when CC contains -std=c11 option

vstinner · vstinner · commit 98228e67dff2 · 2023-08-23T15:47:21.000+02:00
Fix setup.py when the C compiler command has the "-std=c11" option.
Remove "-std=" options from the compiler command.
diff --git a/tests/setup.py b/tests/setup.py
@@ -1,6 +1,8 @@
 #!/usr/bin/env python3
 import os.path
+import shlex
 import sys
+import sysconfig
 
 
 # C++ is only supported on Python 3.6 and newer
@@ -48,6 +50,24 @@ def main():
     except ImportError:
         from distutils.core import setup, Extension
 
+    # gh-105776: When "gcc -std=11" is used as the C++ compiler, -std=c11
+    # option emits a C++ compiler warning. Remove "-std11" option from the
+    # CC command.
+    cmd = (sysconfig.get_config_var('CC') or '')
+    if cmd is not None:
+        cmd = shlex.split(cmd)
+        cmd = [arg for arg in cmd if not arg.startswith('-std=')]
+        if (sys.version_info >= (3, 8)):
+            cmd = shlex.join(cmd)
+        elif (sys.version_info >= (3, 3)):
+            cmd = ' '.join(shlex.quote(arg) for arg in cmd)
+        else:
+            # Python 2.7
+            import pipes
+            cmd = ' '.join(pipes.quote(arg) for arg in cmd)
+        # CC env var overrides sysconfig CC variable in setuptools
+        os.environ['CC'] = cmd
+
     cflags = ['-I' + SRC_DIR]
     cppflags = list(cflags)
     if not MSVC:
