mfbt/double-conversion/use-static_assert.patch

   1 diff --git a/mfbt/double-conversion/utils.h b/mfbt/double-conversion/utils.h
   2 --- a/mfbt/double-conversion/utils.h
   3 +++ b/mfbt/double-conversion/utils.h
   4 @@ -275,19 +275,18 @@ class StringBuilder {
   5  // There is an additional use for BitCast.
   6  // Recent gccs will warn when they see casts that may result in breakage due to
   7  // the type-based aliasing rule.  If you have checked that there is no breakage
   8  // you can use BitCast to cast one pointer type to another.  This confuses gcc
   9  // enough that it can no longer see that you have cast one pointer type to
  10  // another thus avoiding the warning.
  11  template <class Dest, class Source>
  12  inline Dest BitCast(const Source& source) {
  13 -  // Compile time assertion: sizeof(Dest) == sizeof(Source)
  14 -  // A compile error here means your Dest and Source have different sizes.
  15 -  typedef char VerifySizesAreEqual[sizeof(Dest) == sizeof(Source) ? 1 : -1];
  16 +  static_assert(sizeof(Dest) == sizeof(Source),
  17 +                "BitCast's source and destination types must be the same size");
  18
  19    Dest dest;
  20    memmove(&dest, &source, sizeof(dest));
  21    return dest;
  22  }
  23
  24  template <class Dest, class Source>
  25  inline Dest BitCast(Source* source) {