[PATCH, Fortran] Revert to non-multilib-specific ISO_Fortran_binding.h

[Tobias Burnus]

Hi Gerald,

On 13.09.21 17:56, Gerald Pfeifer wrote:
> This broke bootstrap on i586-unknown-freebsd11:
>
>    In file included from .../GCC-HEAD/libgfortran/runtime/ISO_Fortran_binding.c:30:
>    .../GCC-HEAD/libgfortran/ISO_Fortran_binding.h:255:2:
>    error: #error "Can't determine kind of long double"
>    255 | #error "Can't determine kind of long double"
>        |  ^~~~~
>
> Does this work on i586-*-linux?
>
>
> % egrep -r '#define.*LDBL_(MANT_DIG|MIN_EXP|MAX_EXP)' /usr/include/
> /usr/include/x86/float.h:#define LDBL_MANT_DIG  64
> /usr/include/x86/float.h:#define LDBL_MIN_EXP   (-16381)
> /usr/include/x86/float.h:#define LDBL_MAX_EXP   16384
>
> This looks like it matches existing Linux case already in place?

Can you run 'echo | cpp -E -g3|grep DBL' to (or in the build dir: echo |
./gcc/cc1 -E -g3 -dD|grep DBL) to check what's the output?

It might be that /usr/include/x86/float.h is not used; e.g. there is
$(gcc-src)/ginclude/float.h which undef's the LDBL_MAX_EXP to replace it
by a #define using __LDBL_MAX_EXP. Thus, if those are different from the
values under /usr/include, it might be the reason for the fail?

I think it works under Linux, at least the "x86-64 -m32"
libgfortran.{so,a}  build and the -m32 testsuite runs do work.

Tobias

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