gcc 4.7.x inline behaviour change

[Yuri Dario]

With newer gcc releases, code inlining is following a different path than before. This leads to many problems in the build of libc but also of other applications. See ​http://gcc.gnu.org/onlinedocs/gcc-4.7.1/gcc/Inline.html for details.

At this time, this is fixed using -fgnu89-inline which restores old behaviour.

The right thing seems to use 'extern inline' instead of 'static inline'. But without a proper prototype, gcc will still ignore inlining.

Many heaers defines code to be inlined without a prototype.

I'm leaving this ticket open for reference.