build: added compilation warns and flags

Author: thiago-rezende

src/meson.build

@@ -44,14 +44,53 @@ lua_src = [
     'lua.c'
 ]
 
+lua_warns = [
+    '-fmax-errors=5',
+	'-Wextra',
+	'-Wshadow',
+	'-Wsign-compare',
+	'-Wundef',
+	'-Wwrite-strings',
+	'-Wredundant-decls',
+	'-Wdisabled-optimization',
+	'-Wdouble-promotion',
+	'-Wlogical-op',
+	'-Wno-aggressive-loop-optimizations',
+    '-Wdeclaration-after-statement',
+	'-Wmissing-prototypes',
+	'-Wnested-externs',
+	'-Wstrict-prototypes',
+	'-Wc++-compat',
+	'-Wold-style-definition',
+    ## the next warnings might be useful sometimes,
+	## but usually they generate too much noise
+	# '-Werror',
+	# '-pedantic', # warns if we use jump tables
+	# '-Wconversion ',
+	# '-Wsign-conversion',
+	# '-Wstrict-overflow=2',
+	# '-Wformat=2',
+	# '-Wcast-qual'
+]
+
+lua_flags = [
+    '-Wall',
+    '-O2',
+    '-fno-stack-protector',
+    '-fno-common',
+    '-march=native'
+]
+
 if get_option('library_type') == 'static'
     liblua = static_library('liblua',
+        c_args: [lua_warns, lua_flags],
         dependencies: [m_dep],
         sources: [luacore_src, liblua_src, luaaux_src],
         include_directories: lua_inc,
         install: true)
 else
     liblua = shared_library('liblua',
+        c_args: [lua_warns, lua_flags],
         dependencies: [m_dep],
         sources: [luacore_src, liblua_src, luaaux_src],
         include_directories: lua_inc,