cc.has_multi_arguments: Convert all -Wno args

Also add a test for it.

1 files changed, 6 insertions, 6 deletions

diff --git a/mesonbuild/compilers/c.py b/mesonbuild/compilers/c.py
index 7f45ecb..a6bd0af 100644
--- a/mesonbuild/compilers/c.py
+++ b/mesonbuild/compilers/c.py
@@ -840,18 +840,18 @@ class CCompiler(Compiler):
         return ['-pthread']
 
     def has_multi_arguments(self, args, env):
-        for arg in args:
+        for arg in args[:]:
+            # some compilers, e.g. GCC, don't warn for unsupported warning-disable
+            # flags, so when we are testing a flag like "-Wno-forgotten-towel", also
+            # check the equivalent enable flag too "-Wforgotten-towel"
+            if arg.startswith('-Wno-'):
+                    args.append('-W' + arg[5:])
             if arg.startswith('-Wl,'):
                 mlog.warning('''{} looks like a linker argument, but has_argument
 and other similar methods only support checking compiler arguments.
 Using them to check linker arguments are never supported, and results
 are likely to be wrong regardless of the compiler you are using.
 '''.format(arg))
-        # some compilers, e.g. GCC, don't warn for unsupported warning-disable
-        # flags, so when we are testing a flag like "-Wno-forgotten-towel", also
-        # check the equivalent enable flag too "-Wforgotten-towel"
-        if len(args) == 1 and args[0].startswith('-Wno-'):
-                args.append('-W' + args[0][5:])
         return self.compiles('int i;\n', env, extra_args=args)