glibc 2.15.1 branch broken

[Andreas Jaeger]

Carlos,

it seems you cherry picked a bit too selectively. Compiling the 2.15.1 
on Linux/x86-64 fails with:

../sysdeps/x86_64/fpu/multiarch/e_atan2.c: In function 
‘__ieee754_atan2_ifunc’:
../sysdeps/x86_64/fpu/multiarch/e_atan2.c:15:1: error: ‘HAS_YMM_USABLE’ 
undeclared (first use
  in this function)
../sysdeps/x86_64/fpu/multiarch/e_atan2.c:15:1: note: each undeclared 
identifier is reported only once for each function it appears in
../sysdeps/x86_64/fpu/multiarch/e_exp.c: In function ‘__ieee754_exp_ifunc’:
../sysdeps/x86_64/fpu/multiarch/e_exp.c:15:1: error: ‘HAS_YMM_USABLE’ 
undeclared (first use in this function)
../sysdeps/x86_64/fpu/multiarch/e_exp.c:15:1: note: each undeclared 
identifier is reported only once for each function it appears in

Andreas
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