Re: gcc 4.x and support of x87 FPU in libstdc++

[Denis K <deniskravtsov at gmail dot com>]

My settings were taken from the comment here:
http://stackoverflow.com/questions/9450394/how-to-install-gcc-from-scratch-with-gmp-mpfr-mpc-elf-without-shared-librari

--disable-shared
  --disable-bootstrap
  --disable-libstdcxx-pch
  --enable-languages=all
  --enable-libgomp
  --enable-lto
  --enable-threads=posix
  --enable-tls
  --with-gmp=/tmp/gcc
  --with-mpfr=/tmp/gcc
  --with-mpc=/tmp/gcc
  --with-libelf=/tmp/gcc
  --with-fpmath=sse

When I tried supplying  "--with-fpmath=387" instead, I came across the
problem that was in my original question.

On 12 January 2014 02:57, H.J. Lu <hjl.tools@gmail.com> wrote:
> On Sat, Jan 11, 2014 at 6:54 PM, Denis K <deniskravtsov@gmail.com> wrote:
>> Hello,
>>
>> I've been trying to compile gcc 4.5.4 from the sources using
>> --with-fpmath=387 but I'm getting this error: "Invalid
>> --with-fpmath=387". I looked in the configs and found that it doesn't
>> support this option:
>>
>> case ${with_fpmath} in
>>   avx)
>>     tm_file="${tm_file} i386/avxmath.h"
>>     ;;
>>   sse)
>>     tm_file="${tm_file} i386/ssemath.h"
>>     ;;
>>   *)
>>     echo "Invalid --with-fpmath=$with_fpmath" 1>&2
>>     exit 1
>>
>> Basically, I started this whole thing because I need to supply a
>> statically linked executable for an old target platform (in fact, it's
>> an old Celeron but without any SSE2 instructions that are apparently
>> used by libstdc++ by DEFAULT). The executable crashes at the first
>
> How did you configure GCC?
>
>
> --
> H.J.