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* include/c_std/std_cmath.h: Don't import C99's float transcendentals into the __gnu_cxx::__c99_binding namespace. (acos, asin, atan, atan2, ceil, cosh, exp, floor, fmod, frexp, ldexp, log, log10, modf, pow, sinh, tan, tanh): Implement using GCC's math builtins, i.e. __builtin_foo. * libmath/stubs.c (acosf, acosl, asinf, asinl, atanf, atanl, ceilf, ceill, floorf, floorl, fmodf, fmodl, frexpf, frexpl, ldexpf, ldexpl, modff, modfl): Provide stub implementations. From-SVN: r73629
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