On Mon, 4 Oct 2021, Jakub Jelinek via Gcc wrote: > One problem with that is that I think IEEE quad long double support relies > on glibc 2.32 or later, so not sure what exactly would be done if gcc is > built against older glibc when it needs to call libm routines. Perhaps > convert to __ibm128, call the __ibm128 sinl etc. and convert back (big loss > of precision and range, but at least something).
Using libquadmath functions would be better in that case - arranging for libquadmath to be built in this case if it isn't already - than converting to __ibm128. (On the other hand, when _Float128 functions are available in libm, I think it would be better for Fortran to call those rather than libquadmath functions - *f128 (or the __*ieee128 aliases available on powerpc64le for namespace reasons, not sure if those namespace reasons have any relevance to Fortran) instead of *q. See my comments on that in <https://gcc.gnu.org/pipermail/gcc-patches/2021-September/578937.html>.) -- Joseph S. Myers jos...@codesourcery.com
