Bug 1636974 - Unbust base toolchain builds by working around a GCC bug. CLOSED TREE

MANUAL PUSH: Unbust base toolchain builds, CLOSED TREE

layout/style/Loader.h

@@ -206,7 +206,7 @@ class Loader final {
       nsIURI*, SheetParsingMode = eAuthorSheetFeatures,
       UseSystemPrincipal = UseSystemPrincipal::No);
 
-  enum class IsPreload {
+  enum class IsPreload : uint8_t {
     No,
     // This is a speculative load initiated by a <link rel=stylesheet> tag
     // scanned by the parser, or @import rules found in a <style> tag.

layout/style/SheetLoadData.h

@@ -180,7 +180,11 @@ class SheetLoadData final : public nsIRunnable, public nsIThreadObserver {
   bool mLoadFailed : 1;
 
   // Whether this is a preload, and which kind of preload it is.
-  const IsPreload mIsPreload : 2;
+  //
+  // TODO(emilio): This can become a bitfield once we build with a GCC version
+  // that has the fix for https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61414,
+  // which causes a false positive warning here.
+  const IsPreload mIsPreload;
 
   // This is the element that imported the sheet.  Needed to get the
   // charset set on it and to fire load/error events.