stddef include in gmp.h

Clemens clemensgru at
Mon Oct 7 23:16:26 CEST 2013

Hi GMP developers,

on Mac OS X 10.9 the build of GMP 5.1.2 failed, because ptrdiff_t was not exported from stddef.h.
In you define __need_size_t.

Could you please either also #define __need_ptrdiff_t or remove the __need_size_t definition?
Or would adding it create problems on other systems?

Here is an excerpt from a failed build process:
I am not sure why the cpp error "no member named 'ptrdiff_t' in the global namespace” occurs, but “error: unknown type name ‘ptrdiff_t’” would be fixed with adding #define __need_ptrdiff_t, right?

What do you think? Is this a problem in GMP or is this an error in Apple’s distribution of llvm-gcc ?

On current OS X 10.9, Apple uses llvm with either clang or llvm-gcc. Should GMP be compilable by both compiler frontends ?

Best regards,

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