clang: Suppress a few -Wstring-conversion warnings in 3rd-party code.

The warning got stricter recently.

BUG=82385
TBR=brettw

Review URL: https://codereview.chromium.org/758963003

Cr-Commit-Position: refs/heads/master@{#305685}

4 files changed, 22 insertions, 8 deletions

diff --git a/net/third_party/nss/ssl.gyp b/net/third_party/nss/ssl.gyp
index d6e2253..64d8551 100644
--- a/net/third_party/nss/ssl.gyp
+++ b/net/third_party/nss/ssl.gyp
@@ -79,6 +79,12 @@
         'USE_UTIL_DIRECTLY',
       ],
       'msvs_disabled_warnings': [4018, 4244, 4267],
+      'variables': {
+        'clang_warning_flags_unset': [
+          # ssl uses PR_ASSERT(!"foo") instead of PR_ASSERT(false && "foo")
+          '-Wstring-conversion',
+        ],
+      },
       'conditions': [
         ['component == "shared_library"', {
           'conditions': [
diff --git a/net/third_party/nss/ssl/BUILD.gn b/net/third_party/nss/ssl/BUILD.gn
index b8fe40f..c958c13 100644
--- a/net/third_party/nss/ssl/BUILD.gn
+++ b/net/third_party/nss/ssl/BUILD.gn
@@ -8,14 +8,6 @@ config("ssl_config") {
   if (is_mac || is_win) {
     defines = [ "NSS_PLATFORM_CLIENT_AUTH" ]
   }
-
-  if (is_clang) {
-    cflags = [
-      # There is a broken header guard in /usr/include/nss/secmod.h:
-      # https://bugzilla.mozilla.org/show_bug.cgi?id=884072
-      "-Wno-header-guard",
-    ]
-  }
 }
 
 component("libssl") {
@@ -105,6 +97,11 @@ component("libssl") {
     libs = [ "Security.framework" ]
   }
 
+  if (is_clang) {
+    # SSL triggers some of these Clang warnings.
+    configs -= [ "//build/config/clang:extra_warnings" ]
+  }
+
   if (is_posix) {
     sources -= [
       "win32err.c",
diff --git a/third_party/mesa/BUILD.gn b/third_party/mesa/BUILD.gn
index 48b772c..511525a 100644
--- a/third_party/mesa/BUILD.gn
+++ b/third_party/mesa/BUILD.gn
@@ -679,6 +679,11 @@ shared_library("osmesa") {
 
   include_dirs = [ "src/src/mesa/drivers" ]
 
+  if (is_clang) {
+    # Mesa triggers some of these Clang warnings.
+    configs -= [ "//build/config/clang:extra_warnings" ]
+  }
+
   deps = [
     ":mesa_headers",
     ":mesa",
diff --git a/third_party/mesa/mesa.gyp b/third_party/mesa/mesa.gyp
index bc115e1..3db0d4c 100644
--- a/third_party/mesa/mesa.gyp
+++ b/third_party/mesa/mesa.gyp
@@ -700,6 +700,12 @@
         'src/src/mesa/drivers/osmesa/osmesa.c',
         'src/src/mesa/drivers/osmesa/osmesa.def',
       ],
+      'variables': {
+        'clang_warning_flags_unset': [
+          # Don't warn about string->bool used in asserts.
+          '-Wstring-conversion',
+        ],
+      },
     },
   ],
   'conditions': [