Add special casing for VS which ignores unknown arguments.

1 files changed, 21 insertions, 0 deletions

diff --git a/mesonbuild/compilers.py b/mesonbuild/compilers.py
index 5b68eaa..eeb4185 100644
--- a/mesonbuild/compilers.py
+++ b/mesonbuild/compilers.py
@@ -1435,6 +1435,27 @@ class VisualStudioCCompiler(CCompiler):
         # msvc does not have a concept of system header dirs.
         return ['-I' + path]
 
+    # Visual Studio is special. It ignores arguments it does not
+    # understand and you can't tell it to error out on those.
+    # http://stackoverflow.com/questions/15259720/how-can-i-make-the-microsoft-c-compiler-treat-unknown-flags-as-errors-rather-t
+    def has_argument(self, arg):
+        warning_text = b'9002'
+        code = 'int i;\n'
+        (fd, srcname) = tempfile.mkstemp(suffix='.'+self.default_suffix)
+        os.close(fd)
+        ofile = open(srcname, 'w')
+        ofile.write(code)
+        ofile.close()
+        commands = self.exelist + [arg] + self.get_compile_only_args() + [srcname]
+        mlog.debug('Running VS compile:')
+        mlog.debug('Command line: ', ' '.join(commands))
+        mlog.debug('Code:\n', code)
+        p = subprocess.Popen(commands, cwd=os.path.split(srcname)[0], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+        (stde, stdo) = p.communicate()
+        if p.returncode != 0:
+            raise MesonException('Compiling test app failed.')
+        return not(warning_text in stde or warning_text in stdo)
+
 class VisualStudioCPPCompiler(VisualStudioCCompiler):
     def __init__(self, exelist, version, is_cross, exe_wrap):
         VisualStudioCCompiler.__init__(self, exelist, version, is_cross, exe_wrap)