Added option for werror.

backends.py

@@ -341,6 +341,8 @@ class Backend():
         commands += compiler.get_buildtype_args(self.environment.coredata.buildtype)
         if self.environment.coredata.coverage:
             commands += compiler.get_coverage_args()
+        if self.environment.coredata.werror:
+            commands += compiler.get_werror_args()
         if isinstance(target, build.SharedLibrary):
             commands += compiler.get_pic_args()
         for dep in target.get_external_deps():

coredata.py

@@ -40,6 +40,7 @@ class CoreData():
         self.use_pch = options.use_pch
         self.unity = options.unity
         self.coverage = options.coverage
+        self.werror = options.werror
         self.user_options = {}
         self.external_args = {} # These are set from "the outside" with e.g. mesonconf
         self.external_link_args = {}

environment.py

@@ -148,6 +148,9 @@ class CCompiler():
     def get_coverage_link_args(self):
         return ['-lgcov']
 
+    def get_werror_args(self):
+        return ['-Werror']
+
     def get_std_exe_link_args(self):
         return []
 
@@ -597,6 +600,9 @@ class ValaCompiler():
     def get_exelist(self):
         return self.exelist
 
+    def get_werror_args(self):
+        return ['--fatal-warnings']
+
     def get_language(self):
         return self.language
 

meson.py

@@ -66,6 +66,8 @@ parser.add_option('--disable-pch', action='store_false', dest='use_pch', default
                   help='do not use precompiled headers')
 parser.add_option('--unity', action='store_true', dest='unity', default=False,\
                   help='unity build')
+parser.add_option('--werror', action='store_true', dest='werror', default=False,\
+                  help='Treat warnings as errors')
 parser.add_option('--cross-file', default=None, dest='cross_file',
                   help='file describing cross compilation environment')
 

ninjabackend.py

@@ -493,6 +493,8 @@ class NinjaBackend(backends.Backend):
             relsc = os.path.join(self.get_target_dir(target), target.get_basename() + '.dir', sc)
             rel_s = os.path.join(self.build_to_src, s)
             args += ['--deps', relsc + '.d']
+            if self.environment.coredata.werror:
+                args += valac.get_werror_args()
             for d in target.external_deps:
                 if isinstance(d, dependencies.PkgConfigDependency):
                     args += ['--pkg', d.name]

optinterpreter.py

@@ -28,6 +28,7 @@ forbidden_option_names = {'type': True,
                           'datadir' : True,
                           'mandir' : True,
                           'localedir' : True,
+                          'werror' : True,
                           }
 
 class OptionException(coredata.MesonException):