Add special casing for VS which ignores unknown arguments.

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)

test cases/common/112 has arg/meson.build

@@ -1,6 +1,7 @@
-project('has arg', 'c')
+project('has arg', 'c', 'cpp')
 
 cc = meson.get_compiler('c')
+cpp = meson.get_compiler('cpp')
 
 if cc.get_id() == 'msvc'
   is_arg = '/O2'
@@ -15,6 +16,9 @@ isnt_arg = '-fiambroken'
 assert(cc.has_argument(is_arg), 'Arg that should have worked does not work.')
 assert(not cc.has_argument(isnt_arg), 'Arg that should be broken is not.')
 
+assert(cpp.has_argument(is_arg), 'Arg that should have worked does not work.')
+assert(not cpp.has_argument(isnt_arg), 'Arg that should be broken is not.')
+
 # Have useless at the end to ensure that the search goes from front to back.
 l1 = cc.first_supported_argument([isnt_arg, is_arg, isnt_arg, useless])
 l2 = cc.first_supported_argument(isnt_arg, isnt_arg, isnt_arg)
@@ -22,3 +26,10 @@ l2 = cc.first_supported_argument(isnt_arg, isnt_arg, isnt_arg)
 assert(l1.length() == 1, 'First supported returned wrong result.')
 assert(l1.get(0) == is_arg, 'First supported returned wrong argument.')
 assert(l2.length() == 0, 'First supported did not return empty array.')
+
+l1 = cpp.first_supported_argument([isnt_arg, is_arg, isnt_arg, useless])
+l2 = cpp.first_supported_argument(isnt_arg, isnt_arg, isnt_arg)
+
+assert(l1.length() == 1, 'First supported returned wrong result.')
+assert(l1.get(0) == is_arg, 'First supported returned wrong argument.')
+assert(l2.length() == 0, 'First supported did not return empty array.')