GCC: use Wno-error=header-hygiene only with clang.

There is no sense in passing -Wno-error=header-hygiene if -Wno-header-hygiene is not passed (gcc case). Thus, use -Wno-error=header-hygiene only with clang. Bug: chromium:819294 Change-Id: I01bd9771352ab2e8827f1fdd493eb89bb719dd0f Reviewed-on: https://swiftshader-review.googlesource.com/c/24428 Kokoro-Presubmit: kokoro <noreply+kokoro@google.com> Reviewed-by: Alexis Hétu <sugoi@google.com> Tested-by: Alexis Hétu <sugoi@google.com>

GCC: use Wno-error=header-hygiene only with clang.
24f3d30c · Maksim Sisov · Alexis Hétu · 8f71f731 · 24f3d30c
Commit 24f3d30c authored Feb 05, 2019 by Maksim Sisov Committed by Alexis Hétu Feb 05, 2019
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BUILD.gn third_party/llvm-7.0/BUILD.gn +3 -2

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--- a/third_party/llvm-7.0/BUILD.gn
+++ b/third_party/llvm-7.0/BUILD.gn
@@ -55,7 +55,9 @@ config("swiftshader_llvm_private_config") {
  }

  if (is_clang) {
-    cflags += [ "-Wno-header-hygiene" ]
+    cflags += [ "-Wno-header-hygiene",
+                "-Wno-error=header-hygiene"
+    ]
    if (target_cpu == "x86" || target_cpu == "x64") {
      cflags += [ "-msse2" ]
    }
@@ -70,7 +72,6 @@ config("swiftshader_llvm_private_config") {
    "-Wno-unused-private-field",
    "-Wno-unused-result",
    "-Wno-unused-variable",
-    "-Wno-error=header-hygiene",
  ]

  defines = [