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 diff --git a/mfbt/double-conversion/utils.h b/mfbt/double-conversion/utils.h

 --- a/mfbt/double-conversion/utils.h

 +++ b/mfbt/double-conversion/utils.h

 @@ -275,19 +275,18 @@ class StringBuilder {

  // There is an additional use for BitCast.

  // Recent gccs will warn when they see casts that may result in breakage due to

  // the type-based aliasing rule.  If you have checked that there is no breakage

  // you can use BitCast to cast one pointer type to another.  This confuses gcc

  // enough that it can no longer see that you have cast one pointer type to

  // another thus avoiding the warning.

  template <class Dest, class Source>

  inline Dest BitCast(const Source& source) {

 -  // Compile time assertion: sizeof(Dest) == sizeof(Source)

 -  // A compile error here means your Dest and Source have different sizes.

 -  typedef char VerifySizesAreEqual[sizeof(Dest) == sizeof(Source) ? 1 : -1];

 +  static_assert(sizeof(Dest) == sizeof(Source),

 +                "BitCast's source and destination types must be the same size");

    Dest dest;

    memmove(&dest, &source, sizeof(dest));

    return dest;

  }

  template <class Dest, class Source>

  inline Dest BitCast(Source* source) {