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glibc  2.9
s_fabs.c
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00001 #include <math.h>
00002 #include <math_ldbl_opt.h>
00003 
00004 double __fabs (double x)
00005 {
00006   return __builtin_fabs (x);
00007 }
00008 weak_alias (__fabs, fabs)
00009 #if LONG_DOUBLE_COMPAT(libm, GLIBC_2_0)
00010 compat_symbol (libm, __fabs, fabsl, GLIBC_2_0);
00011 #endif