Follow-up Comment #2, bug #57071 (project avr-libc):
Here is a version without __asm(symbol) that defines a symbol for double only
if sizeof(double) == sizeof(float).
* include/math.h
(cosf, sinf, tanf, fmodf, modff, sqrtf, cbrtf, hypotf, squaref)
(floorf, ceilf, frexpf, ldexpf, expf, coshf, sinhf, tanhf, asinf)
(acosf, atanf, atan2f, logf, log10f, powf, isnanf, isinff)
(signbitf, fdimf, fmaf, fmaxf, fmin, truncf, roundf, lroundf)
(lrintf): Turn from macro to proper prototype.
(fabs, fabsf, isfinite, isfinitef, copysign, copysignf): Implement.
* libm/fplib/asmdef.h (ALIAS_ENTRY): Remove.
(ENTRY_DOUBLE32): New .macro that only defines the symbol
if __SIZEOF_DOUBLE__ == __SIZEOF_FLOAT__.
* libm/fplib/acos.S: Use correct names for functions that deal
with float, e.g. acosf instead of acos. Provide double symbol
only if __SIZEOF_DOUBLE__ == __SIZEOF_FLOAT__.
* libm/fplib/asin.S: Same.
* libm/fplib/atan.S: Same.
* libm/fplib/atan2.S: Same.
* libm/fplib/cbrt.S: Same.
* libm/fplib/ceil.S: Same.
* libm/fplib/copysign.S: Same.
* libm/fplib/cos.S: Same.
* libm/fplib/cosh.S: Same.
* libm/fplib/exp.S: Same.
* libm/fplib/fdim.S: Same.
* libm/fplib/floor.S: Same.
* libm/fplib/fma.S: Same.
* libm/fplib/fmax.S: Same.
* libm/fplib/fmin.S: Same.
* libm/fplib/fmod.S: Same.
* libm/fplib/fp_arccos.S: Same.
* libm/fplib/frexp.S: Same.
* libm/fplib/hypot.S: Same.
* libm/fplib/isfinite.S: Same.
* libm/fplib/isinf.S: Same.
* libm/fplib/isnan.S: Same.
* libm/fplib/ldexp.S: Same.
* libm/fplib/log.S: Same.
* libm/fplib/log10.S: Same.
* libm/fplib/lrint.S: Same.
* libm/fplib/lround.S: Same.
* libm/fplib/modf.S: Same.
* libm/fplib/pow.S: Same.
* libm/fplib/round.S: Same.
* libm/fplib/signbit.S: Same.
* libm/fplib/sin.S: Same.
* libm/fplib/sinh.S: Same.
* libm/fplib/sqrt.S: Same.
* libm/fplib/square.S: Same.
* libm/fplib/tan.S: Same.
* libm/fplib/tanh.S: Same.
* libm/fplib/trunc.S: Same.
(file #47711)
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