gn: make some warning flags match gyp more closely

This fixes differences in -Wno-unused-function and
-Wno-unneeded-internal-declaration.

It also changes the diff'ing script to accept

-Wendif-labels
-Wextra
-Wsign-compare

when in GN but not gyp, because they're more conservative. These
mostly happen when GN declares a lib chromium_code, but gyp doesn't.

Also, remove some defines from the dont_care, as I'm not sure that
we don't care yet.

And some minor tweaks to diff script output.

R=brettw@chromium.org
BUG=335824

Review URL: https://codereview.chromium.org/555343002

Cr-Commit-Position: refs/heads/master@{#294229}

1 files changed, 8 insertions, 0 deletions

diff --git a/breakpad/BUILD.gn b/breakpad/BUILD.gn
index 899cfef..68eb059 100644
--- a/breakpad/BUILD.gn
+++ b/breakpad/BUILD.gn
@@ -145,6 +145,10 @@ if (current_toolchain == host_toolchain && !is_win) {
     ]
 
     configs += [ ":tools_config" ]
+
+    # There are some warnings in this code.
+    configs -= [ "//build/config/compiler:chromium_code" ]
+    configs += [ "//build/config/compiler:no_chromium_code" ]
   }
 }
 
@@ -478,6 +482,10 @@ if (is_linux) {
       "src/third_party/linux/include",
       ".",
     ]
+
+    # There are some warnings in this code.
+    configs -= [ "//build/config/compiler:chromium_code" ]
+    configs += [ "//build/config/compiler:no_chromium_code" ]
   }
 
   test("breakpad_unittests") {