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2011-05-09 Paolo Carlini <paolo.carlini@oracle.com> PR libstdc++/48933 * include/c_global/cmath (acosh, asinh, atanh, cbrt, copysign, erf, erfc, exp2, expm1, fdim, fma, fmax, hypot, ilogb, lgamma, llrint, llround, log1p, log2, logb, lrint, lround, nearbyint, nextafter, nexttoward, remainder, remquo, rint, round, scalbln, scalbn, tgamma, trunc): Use __enable_if on the return type. * include/tr1/cmath: Likewise. * testsuite/26_numerics/headers/cmath/overloads_c++0x_neg.cc: New. * testsuite/tr1/8_c_compatibility/cmath/overloads_neg.cc: Likewise. From-SVN: r173574