clang on windows support

1) Run python bin/fetch-clang-win
2) Set clang_win = "../bin/clang_win"
3) ???
4) Profit

Most changes here are to pass the right -mfoo flags to Clang
to enable advanced instruction sets, or fixed warning-as-errors.

BUG=skia:2679

Change-Id: Ieed145d35c209131c7c16fdd3ee11a3de4a1a921
Reviewed-on: https://skia-review.googlesource.com/28740
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>

1 files changed, 5 insertions, 5 deletions

diff --git a/BUILD.gn b/BUILD.gn
index 5956f6729a..d837d1db0a 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -250,7 +250,7 @@ opts("crc32") {
 opts("sse2") {
   enabled = is_x86
   sources = skia_opts.sse2_sources
-  if (is_win) {
+  if (!is_clang && is_win) {
     defines = [ "SK_CPU_SSE_LEVEL=SK_CPU_SSE_LEVEL_SSE2" ]
   } else {
     cflags = [ "-msse2" ]
@@ -260,7 +260,7 @@ opts("sse2") {
 opts("ssse3") {
   enabled = is_x86
   sources = skia_opts.ssse3_sources
-  if (is_win) {
+  if (!is_clang && is_win) {
     defines = [ "SK_CPU_SSE_LEVEL=SK_CPU_SSE_LEVEL_SSSE3" ]
   } else {
     cflags = [ "-mssse3" ]
@@ -270,7 +270,7 @@ opts("ssse3") {
 opts("sse41") {
   enabled = is_x86
   sources = skia_opts.sse41_sources
-  if (is_win) {
+  if (!is_clang && is_win) {
     defines = [ "SK_CPU_SSE_LEVEL=SK_CPU_SSE_LEVEL_SSE41" ]
   } else {
     cflags = [ "-msse4.1" ]
@@ -280,7 +280,7 @@ opts("sse41") {
 opts("sse42") {
   enabled = is_x86
   sources = skia_opts.sse42_sources
-  if (is_win) {
+  if (!is_clang && is_win) {
     defines = [ "SK_CPU_SSE_LEVEL=SK_CPU_SSE_LEVEL_SSE42" ]
   } else {
     cflags = [ "-msse4.2" ]
@@ -290,7 +290,7 @@ opts("sse42") {
 opts("avx") {
   enabled = is_x86
   sources = skia_opts.avx_sources
-  if (is_win) {
+  if (!is_clang && is_win) {
     cflags = [ "/arch:AVX" ]
   } else {
     cflags = [ "-mavx" ]