Hi everyone,
I'm having trouble building programs for a SuperH-4 target without FPU.
My current setup uses an sh4eb-nofpu-elf target which usually behaves
very well (much better than sh4eb-elf that uses a lot of fmov for
optimization), but I discovered that using a va_list causes the dreaded,
illegal fmov instruction to be generated.
I've looked up available options and expected -m4-nofpu to be of help,
however GCC does not agree with this estimation:
sh4eb-nofpu-elf-gcc: error: command line option '-m4-nofpu' is not
supported by this configuration
When building I expected this target to support the option "by default".
I've tried building again and I found no relevant flag, even in the
recursive configure help.
Here is what the compiler looks like in more detail:
Using built-in specs.
COLLECT_GCC=sh4eb-nofpu-elf-gcc
COLLECT_LTO_WRAPPER=/home/el/opt/sh4eb-nofpu-elf-2.32-8.3.0/libexec/gcc/sh4eb-nofpu-elf/8.3.0/lto-wrapper
Target: sh4eb-nofpu-elf
Configured with: ../gcc-8.3.0/configure
--prefix=/home/el/opt/sh4eb-nofpu-elf-2.32-8.3.0
--target=sh4eb-nofpu-elf --enable-languages=c,c++ --without-headers
--with-newlib --disable-nls --disable-werror --enable-libssp --enable-lto
Thread model: single
gcc version 8.3.0 (GCC)
How can I fix this setup to generate entirely FPU-free programs?
Any insight would be deeply appreciated!
Cheers,
Sébastien
