https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100662
--- Comment #10 from Steve Kargl <sgk at troutmask dot apl.washington.edu> --- On Wed, May 19, 2021 at 09:45:12AM +0000, ripero84 at gmail dot com wrote: > --- Comment #9 from ripero84 at gmail dot com --- > Steve, is this a GCC bug or a FreeBSD bug (or if it is something else, what > side does this belong to)? I suppose it is both. AFAIK, there is no longer an active FreeBSD maintainer for GCC (if there were, the few non-gfortran PR/patches I submitted would have been committed). I no longer send patches to GCC for gfortran as I know virtually nothing about git. > Other OSs seem to be able to compile gfortran with these modules for these > architectures, see, e.g., > https://packages.ubuntu.com/focal/arm64/gfortran-10/filelist and > https://packages.ubuntu.com/focal/ppc64el/gfortran-10/filelist). And they > seem > to have been able to do so since the introduction of the three Fortran IEEE > intrinsic modules in GCC 5 > (https://packages.ubuntu.com/bionic/amd64/gfortran-5/filelist and > https://packages.ubuntu.com/bionic/ppc64el/gfortran-5/filelist). Therefore, > some kind of solution must exist for this - and probably has been there for > over half a decade. (Apologies for not being able to provide a better insight > from the Ubuntu sources.) ubuntu is glibc. You (or something) needs to read libgfortran/configure.host, and add the needed logic for FreeBSD to pick up an appropriate fpu-*.h file on aarch64. The first 3 non-comment lines of that file are # DEFAULTS fpu_host='fpu-generic' ieee_support='no' which is what non-i386/amd64 FreeBSD systems likely use. It seems fpu-generic.h provides stubs for a few functions required to build gfortran. After gfortran is built, installation does not install useless ieee*.mod files. Note, a standard conforming Fortran compiler is not required to support the ieee modules. Furhter down in the file, there is a check for fenv compatibilities, if test "x${have_feenableexcept}" = "xyes"; then fpu_host='fpu-glibc' ieee_support='yes' fi but the name of the file seems too specific to glibc. If fenv facilities are available, I would have thought the file would be named fpu-fenv.h. My guess is that configure does not find fenv on aarch64 FreeBSD and/or aarch64 FreeBSD does not support fenv.
