--- chromium-75.0.3770.142/build/config/compiler/BUILD.gn.orig	2019-08-06 18:59:29.345910533 +0300
+++ chromium-75.0.3770.142/build/config/compiler/BUILD.gn	2019-08-06 18:55:45.301821672 +0300
@@ -230,8 +230,6 @@ config("compiler") {
 
   configs += [
     # See the definitions below.
-    ":clang_revision",
-    ":compiler_cpu_abi",
     ":compiler_codegen",
     ":compiler_deterministic",
   ]
@@ -471,20 +469,6 @@ config("compiler") {
     }
   }
 
-  if (is_clang && !is_nacl && !use_xcode_clang) {
-    cflags += [ "-fcrash-diagnostics-dir=" +
-                rebase_path("//tools/clang/crashreports", root_build_dir) ]
-
-    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",
-    ]
-  }
-
   # C11/C++11 compiler flags setup.
   # ---------------------------
   if (is_linux || is_android || (is_nacl && is_clang) || current_os == "aix") {
@@ -1525,7 +1515,7 @@ config("chromium_code") {
       defines = [ "_HAS_NODISCARD" ]
     }
   } else {
-    cflags = [ "-Wall" ]
+    cflags = []
     if (treat_warnings_as_errors) {
       cflags += [ "-Werror" ]
 
@@ -1534,10 +1524,6 @@ config("chromium_code") {
       # well.
       ldflags = [ "-Werror" ]
     }
-    if (is_clang) {
-      # Enable extra warnings for chromium_code when we control the compiler.
-      cflags += [ "-Wextra" ]
-    }
 
     # In Chromium code, we define __STDC_foo_MACROS in order to get the
     # C99 macros on Mac and Linux.
@@ -1546,15 +1532,6 @@ config("chromium_code") {
       "__STDC_FORMAT_MACROS",
     ]
 
-    if (!is_debug && !using_sanitizer && current_cpu != "s390x" &&
-        current_cpu != "s390" && current_cpu != "ppc64" &&
-        current_cpu != "mips" && current_cpu != "mips64") {
-      # 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" ]