Suppress a MSVC cast warning in GN.

Also came up when using the BUILD.gn file with ANGLE. ANGLE bug: 3088

Suppress a MSVC cast warning in GN.
08fe88a9 · Jamie Madill · 49309646 · 08fe88a9
Commit 08fe88a9 authored Jan 24, 2019 by Jamie Madill
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BUILD.gn BUILD.gn +5 -0

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--- a/BUILD.gn
+++ b/BUILD.gn
@@ -148,6 +148,11 @@ source_set("glslang_sources") {
      "-Wno-unused-variable",
    ]
  }
+  if (is_win && !is_clang) {
+    cflags = [
+      "/wd4018", # signed/unsigned mismatch
+    ]
+  }
  deps = [
    "${spirv_tools_dir}:spvtools_opt",