9.555 memchr

POSIX specification:
http://www.opengroup.org/onlinepubs/9699919799/functions/memchr.html

Gnulib module: memchr or memchr-obsolete

Portability problems fixed by either Gnulib module memchr or memchr-obsolete:

• This function dereferences too much memory on some platforms: glibc 2.10 on x86_64, IA-64; glibc 2.11 on Alpha.

Portability problems fixed by Gnulib module memchr-obsolete:

• This function is missing on some older platforms.

Portability problems not fixed by Gnulib: