tree c69c1d7a8ccb3b73c2cdadee8ed732461cd0300b
parent dc1bed62272045651e4bbf2cd85f6fccaf7b1331
author Jason Evans <jasone@canonware.com> 1386313310 -0800
committer Jason Evans <jasone@canonware.com> 1386313310 -0800

Disable floating point code/linking when possible.

Unless heap profiling is enabled, disable floating point code and don't
link with libm.  This, in combination with e.g. EXTRA_CFLAGS=-mno-sse on
x64 systems, makes it possible to completely disable floating point
register use.  Some versions of glibc neglect to save/restore
caller-saved floating point registers during dynamic lazy symbol
loading, and the symbol loading code uses whatever malloc the
application happens to have linked/loaded with, the result being
potential floating point register corruption.