new: argument 1 value '18446744073709551599' exceeds maximum

[AndrewAPrice]

When I compile user programs in my OS using gcc and libc++ and optimizations turned on, I get the following warning when I call 'new':

Code: Select all

../Libraries/libcxx/public/new:248:24: warning: argument 1 value '18446744073709551599' exceeds maximum object size 9223372036854775807 [-Walloc-size-larger-than=]
  248 |   return ::operator new(__args...);

It hasn't yet caused any noticble bugs, and I the warning doesn't appear when optimizations are disabled.

I'm curious why I'm getting this warning through.
18446744073709551599 = 0xFFFFFFFFFFFFFFEF Is something trying to allocate -16 bytes?

[Octocontrabass]

When I compile user programs in my OS using clang

Are you sure you're using Clang? That looks like a GCC warning.

Is something trying to allocate -16 bytes?

The static analyzer seems to think so. There may be a problem in your bounds checking, or (if you're actually using GCC) you might have hit a false positive.

[AndrewAPrice]

You're right, I'm using GCC 12.2.0.