build: remove warning cflags from V8 build

common.gypi

@@ -3,7 +3,6 @@
  'configuring_node%': 0,
  'asan%': 0,
  'ubsan%': 0,
- 'werror': '', # Turn off -Werror in V8 build.
  'visibility%': 'hidden', # V8's visibility setting
  'target_arch%': 'ia32', # set v8's target architecture
  'host_arch%': 'ia32', # set v8's host architecture

tools/v8_gypfiles/toolchain.gypi

@@ -82,7 +82,6 @@
  'v8_toolset_for_shell%': 'target',
 
  'host_os%': '<(OS)',
- 'werror%': '-Werror',
  # For a shared library build, results in "libv8-<(soname_version).so".
  'soname_version%': '',
 
@@ -133,23 +132,14 @@
  '<(V8_ROOT)',
  '<(V8_ROOT)/include',
  ],
+ 'cflags!': ['-Wall', '-Wextra'],
  'conditions': [
- ['clang==1', {
- 'cflags': [ '-Werror', '-Wno-unknown-pragmas' ],
- },{
- 'cflags!': [ '-Wall', '-Wextra' ],
+ ['clang==0', {
  'cflags': [
- '-Wno-return-type',
  # On by default in Clang and V8 requires it at least for arm64.
  '-flax-vector-conversions',
  ],
  }],
- ['clang==1 or OS!="win"', {
- 'cflags': [ '-Wno-invalid-offsetof' ],
- 'xcode_settings': {
- 'WARNING_CFLAGS': ['-Wno-invalid-offsetof']
- },
- }],
  ['v8_target_arch=="arm"', {
  'defines': [
  'V8_TARGET_ARCH_ARM',
@@ -434,9 +424,6 @@
  ['_toolset=="target"', {
  'conditions': [
  ['v8_target_arch==target_arch', {
- 'cflags': [
- '-Wno-error=array-bounds', # Workaround https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56273
- ],
  'conditions': [
  ['v8_target_arch=="mips64el"', {
  'cflags': ['-EL'],