chromium-browser-stable/chromium-compiler-r4.patch

--- chromium-71.0.3578.10/build/config/compiler/BUILD.gn.build-gentoo	2018-10-17 21:13:16.000000000 +0200
+++ chromium-71.0.3578.10/build/config/compiler/BUILD.gn	2018-10-19 21:05:22.593222429 +0200
@@ -237,8 +237,6 @@
 
   configs += [
     # See the definitions below.
-    ":clang_revision",
-    ":compiler_cpu_abi",
     ":compiler_codegen",
   ]
 
@@ -502,17 +500,6 @@
     }
   }
 
-  if (is_clang && !is_nacl && !use_xcode_clang) {
-    cflags += [
-      # TODO(hans): Remove this once Clang generates better optimized debug info
-      # by default. https://crbug.com/765793
-      "-Xclang",
-      "-mllvm",
-      "-Xclang",
-      "-instcombine-lower-dbg-declare=0",
-    ]
-  }
-
   # Print absolute paths in diagnostics. There is no precedent for doing this
   # on Linux/Mac (GCC doesn't support it), but MSVC does this with /FC and
   # Windows developers rely on it (crbug.com/636109) so only do this on Windows.
@@ -1497,11 +1484,6 @@
       if (current_toolchain == host_toolchain || !use_xcode_clang) {
         # Flags NaCl (Clang 3.7) and Xcode 9.2 (Clang clang-900.0.39.2) do not
         # recognize.
-        cflags += [
-          # Ignore warnings about MSVC optimization pragmas.
-          # TODO(thakis): Only for no_chromium_code? http://crbug.com/912662
-          "-Wno-ignored-pragma-optimize",
-        ]
         if (is_fuchsia) {
           cflags += [
             # TODO(hans): https://crbug.com/890307
@@ -1548,22 +1530,6 @@
       "__STDC_FORMAT_MACROS",
     ]
 
-    if (!is_debug && !using_sanitizer &&
-        (!is_linux || !is_clang || is_official_build) &&
-        current_cpu != "s390x" && current_cpu != "s390" &&
-        current_cpu != "ppc64" && current_cpu != "ppc64" &&
-        current_cpu != "mips" && current_cpu != "mips64") {
-      # _FORTIFY_SOURCE isn't really supported by Clang now, see
-      # http://llvm.org/bugs/show_bug.cgi?id=16821.
-      # It seems to work fine with Ubuntu 12 headers though, so use it in
-      # official builds.
-      #
-      # Non-chromium code is not guaranteed to compile cleanly with
-      # _FORTIFY_SOURCE. Also, fortified build may fail when optimizations are
-      # disabled, so only do that for Release build.
-      defines += [ "_FORTIFY_SOURCE=2" ]
-    }
-
     if (is_mac) {
       cflags_objc = [ "-Wobjc-missing-property-synthesis" ]
       cflags_objcc = [ "-Wobjc-missing-property-synthesis" ]