https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105206
--- Comment #4 from Steve Kargl <sgk at troutmask dot apl.washington.edu> --- On Mon, Apr 11, 2022 at 02:45:22PM +0000, kargl at gcc dot gnu.org wrote: > > This might be related to PR89125. The patch I attached to that PR has never > found its way into the repository. I'll do some more testing later today. > Yep. This is related to PR89125. GCC does not use configure to check for the availability of individual C99 libm functions. After updating the patch in PR89125 for the *.c to *.cc migration the patch gcc gives foof: .LFB3: .cfi_startproc mulss .LC0(%rip), %xmm0 jmp expf .cfi_endproc food: .LFB4: .cfi_startproc mulsd .LC1(%rip), %xmm0 jmp exp .cfi_endproc fool: .LFB5: .cfi_startproc pushq %rbp .cfi_def_cfa_offset 16 .cfi_offset 6, -16 movq %rsp, %rbp .cfi_def_cfa_register 6 fldt 16(%rbp) popq %rbp .cfi_def_cfa 7, 8 fldt .LC2(%rip) fmulp %st, %st(1) fldl2e fmulp %st, %st(1) fld %st(0) frndint fsubr %st, %st(1) fxch %st(1) f2xm1 fld1 faddp %st, %st(1) fscale fstp %st(1) ret .cfi_endproc