python: use same compiler flags than CMake

cpp files are built before building the python extension.

setup.py

@@ -57,29 +57,55 @@ def get_version():
                 return v_code
 
 
+def get_cpp_extra_compile_args(compiler):
+    """
+    Get the extra compile arguments for libjsonnet C++ compilation.
+    """
+    if compiler.compiler_type == 'msvc':
+        return []
+    else:
+        return ["-Wextra", "-Woverloaded-virtual", "-pedantic", "-std=c++11"]
+
+
+def get_c_extra_compile_args(compiler):
+    """
+    Get the extra compile arguments for python jsonnet C compilation.
+    """
+    if compiler.compiler_type == 'msvc':
+        return []
+    else:
+        return ["-Wextra", "-pedantic", "-std=c99"]
+
+
 class custom_build_ext(build_ext):
     def build_extension(self, ext):
         if ext.name == '_jsonnet':
             to_c_array(os.path.join(DIR, 'stdlib/std.jsonnet'), os.path.join(DIR, 'core/std.jsonnet.h'))
 
+            objects = self.compiler.compile([
+                'core/desugarer.cpp',
+                'core/formatter.cpp',
+                'core/libjsonnet.cpp',
+                'core/lexer.cpp',
+                'core/parser.cpp',
+                'core/pass.cpp',
+                'core/static_analysis.cpp',
+                'core/string_utils.cpp',
+                'core/vm.cpp',
+                'third_party/md5/md5.cpp'],
+                extra_postargs=get_cpp_extra_compile_args(self.compiler),
+                include_dirs=['include', 'third_party/md5', 'third_party/json'])
+
+            ext.extra_compile_args = get_c_extra_compile_args(self.compiler)
+            ext.extra_objects = objects
+
         build_ext.build_extension(self, ext)
 
 
 jsonnet_ext = Extension(
     '_jsonnet',
-    sources=['python/_jsonnet.c',
-             'core/desugarer.cpp',
-             'core/formatter.cpp',
-             'core/libjsonnet.cpp',
-             'core/lexer.cpp',
-             'core/parser.cpp',
-             'core/pass.cpp',
-             'core/static_analysis.cpp',
-             'core/string_utils.cpp',
-             'core/vm.cpp',
-             'third_party/md5/md5.cpp'],
-    include_dirs=['include', 'third_party/md5', 'third_party/json'],
-    language='c++'
+    sources=['python/_jsonnet.c'],
+    include_dirs=['include', 'third_party/md5', 'third_party/json']
 )
 
 setup(name='jsonnet',