Minor Fixes for Windows GN build.

third_party/yasm/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # The yasm build process creates a slew of small C subprograms that
 # dynamically generate files at various point in the build process.  This makes
 # the build integration moderately complex.
 #
 # There are three classes of dynamically generated files:
 #   1) C source files that should be included in the build (eg., lc3bid.c)
@@ skipping 29 matching lines @@
     include_dirs = [
       "source/config/$os",
       "source/patched-yasm",
     ]
     source_prereqs = [
       config_makefile,
       "source/config/$os/config.h",
       "source/config/$os/libyasm-stdint.h",
     ]
     defines = [ "HAVE_CONFIG_H" ]
-    cflags = [ "-std=gnu99" ]
+    if (is_posix) {
+      cflags = [ "-std=gnu99" ]
+    }
   }
 
   executable("genmacro") {
     sources = [ "source/patched-yasm/tools/genmacro/genmacro.c" ]
     configs -= [ "//build/config/compiler:chromium_code" ]
     configs += [ ":yasm_config",
                  "//build/config/compiler:no_chromium_code" ]
   }
 
   executable("genmodule") {
@@ skipping 54 matching lines @@
        "source/patched-yasm/tools/re2c/mbo_getopt.c",
        "source/patched-yasm/tools/re2c/substr.c",
        "source/patched-yasm/tools/re2c/translate.c",
     ]
 
     configs -= [ "//build/config/compiler:chromium_code" ]
     configs += [ ":yasm_config",
                  "//build/config/compiler:no_chromium_code" ]
 
     # re2c is missing CLOSEVOP from one switch.
-    cflags = [ "-Wno-switch" ]
+    if (is_posix) {
+      cflags = [ "-Wno-switch" ]
+    }
   }
 
   executable("yasm") {
     sources = [
       "source/patched-yasm/frontends/yasm/yasm-options.c",
       "source/patched-yasm/frontends/yasm/yasm.c",
       "source/patched-yasm/libyasm/assocdat.c",
       "source/patched-yasm/libyasm/bc-align.c",
       "source/patched-yasm/libyasm/bc-data.c",
       "source/patched-yasm/libyasm/bc-incbin.c",
@@ skipping 75 matching lines @@
     configs -= [ "//build/config/compiler:chromium_code" ]
     configs += [ ":yasm_config",
                  "//build/config/compiler:no_chromium_code" ]
 
     # Yasm generates a bunch of .c files which its source file #include.
     # Add the |target_gen_dir| into the include path so it can find them.
     # Ideally, these generated .c files would be placed into a separate
     # directory, but the gen_x86_insn.py script does not make this easy.
     include_dirs = [ yasm_gen_include_dir ]
 
-    cflags = [ "-ansi", "-pedantic" ]
-    if (is_clang) {
-      cflags += [ "-Wno-incompatible-pointer-types" ]
+    if (is_win) {
+      cflags = [ "/wd4267" ]  # size_t to int conversion.
+    } else {
+      cflags = [ "-ansi", "-pedantic" ]
+      if (is_clang) {
+        cflags += [ "-Wno-incompatible-pointer-types" ]
+      }
     }
 
     # TODO(ajwong): This should take most of the generated output as
     # source_prereqs.
     deps = [
       ":compile_gperf",
       ":compile_gperf_for_include",
       ":compile_nasm_macros",
       ":compile_nasm_version",
+      ":compile_re2c_lc3b",
       ":compile_win64_gas",
       ":compile_win64_nasm",
       ":compile_re2c",
       ":generate_license",
       ":generate_module",
       ":generate_version",
       ":yasm_utils",
     ]
   }
 
@@ skipping 150 matching lines @@
     script = "source/patched-yasm/modules/arch/x86/gen_x86_insn.py"
     # Output eventually #included by source/patched-yasm/frontends/yasm/x86id.c
     outputs = [
       "$yasm_gen_include_dir/x86insns.c",
       "$yasm_gen_include_dir/x86insn_gas.gperf",
       "$yasm_gen_include_dir/x86insn_nasm.gperf",
     ]
     args = [ rebase_path(yasm_gen_include_dir, root_build_dir) ]
   }
 }