Vulkan: Fix gcc compile error

Add 'no-unused-function' to compile glslang BUG=angleproject:2301 Change-Id: Iac741e007873fb718527514210649e6b658a63b8 Reviewed-on: https://chromium-review.googlesource.com/898394 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>

Vulkan: Fix gcc compile error
2d1c0a2b · jchen10 · Commit Bot · 44dcb911 · 2d1c0a2b
Commit 2d1c0a2b authored Feb 02, 2018 by jchen10 Committed by Commit Bot Feb 06, 2018
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BUILD.gn src/vulkan_support/BUILD.gn +5 -1

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--- a/src/vulkan_support/BUILD.gn
+++ b/src/vulkan_support/BUILD.gn
@@ -594,12 +594,16 @@ config("glslang_config") {
 }
 config("glslang_internal_config") {
+  cflags = []
  if (is_clang || !is_win) {
-    cflags = [
+    cflags += [
      "-Wno-ignored-qualifiers",
      "-Wno-reorder",
    ]
  }
+  if (!is_clang && !is_win) {
+    cflags += [ "-Wno-unused-function" ]
+  }
  if (is_clang) {
    # TODO(thakis): Consider enabling this, https://crbug.com/807632
    cflags += [ "-Wno-implicit-fallthrough" ]