Add a has_arg method to compiler to check whether it supports a given argument.

mesonbuild/compilers.py

@@ -293,6 +293,9 @@ class Compiler():
     def get_library_dirs(self):
         return []
 
+    def has_arg(self, arg):
+        raise EnvironmentException('Language {} does not support has_arg.'.format(self.language))
+
 class CCompiler(Compiler):
     def __init__(self, exelist, version, is_cross, exe_wrapper=None):
         super().__init__(exelist, version)
@@ -506,6 +509,8 @@ int main () {{ {1}; }}'''
         return p
 
     def compiles(self, code, extra_args = []):
+        if isinstance(extra_args, str):
+            extra_args = [extra_args]
         suflen = len(self.default_suffix)
         (fd, srcname) = tempfile.mkstemp(suffix='.'+self.default_suffix)
         os.close(fd)
@@ -819,6 +824,9 @@ void bar() {
     def thread_link_flags(self):
         return ['-pthread']
 
+    def has_arg(self, arg):
+        return self.compiles('int i;\n', extra_args=arg)
+
 class CPPCompiler(CCompiler):
     def __init__(self, exelist, version, is_cross, exe_wrap):
         CCompiler.__init__(self, exelist, version, is_cross, exe_wrap)

mesonbuild/interpreter.py

@@ -583,6 +583,7 @@ class CompilerHolder(InterpreterObject):
                              'version' : self.version_method,
                              'cmd_array' : self.cmd_array_method,
                              'find_library': self.find_library_method,
+                             'has_arg' : self.has_arg_method,
                             })
 
     def version_method(self, args, kwargs):
@@ -789,6 +790,12 @@ class CompilerHolder(InterpreterObject):
         lib = dependencies.ExternalLibrary(libname, linkargs)
         return ExternalLibraryHolder(lib)
 
+    def has_arg_method(self, args, kwargs):
+        args = mesonlib.stringlistify(args)
+        if len(args) != 1:
+            raise InterpreterException('Has_arg takes exactly one argument.')
+        return self.compiler.has_arg(args[0])
+
 class ModuleState:
     pass
 

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

@@ -0,0 +1,14 @@
+project('has arg', 'c')
+
+cc = meson.get_compiler('c')
+
+if cc.get_id() == 'msvc'
+  is_arg = '/O2'
+else
+  is_arg = '-O2'
+endif
+
+isnt_arg = '-fiambroken'
+
+assert(cc.has_arg(is_arg), 'Arg that should have worked does not work.')
+assert(not cc.has_arg(isnt_arg), 'Arg that should be broken is not.')