[Bug libfortran/104233] New: [12 regression] ieee/issignaling_fallback.h broke Solaris/SPARC bootstrap

["ro at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104233

            Bug ID: 104233
           Summary: [12 regression] ieee/issignaling_fallback.h broke
                    Solaris/SPARC bootstrap
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libfortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ro at gcc dot gnu.org
                CC: fxcoudert at gcc dot gnu.org
  Target Milestone: ---
            Target: sparc-sun-solaris2.11

The introduction of ieee/issignaling_fallback.h broke Solaris/SPARC bootstrap:

In file included from
/vol/gcc/src/hg/master/local/libgfortran/ieee/ieee_helper.c:32:
/vol/gcc/src/hg/master/local/libgfortran/ieee/issignaling_fallback.h:204:3:
error: unknown type name ‘__float128’
  204 |   __float128 value;
      |   ^~~~~~~~~~
/vol/gcc/src/hg/master/local/libgfortran/ieee/issignaling_fallback.h:218:20:
error: unknown type name ‘__float128’; did you mean ‘_Float128’?
  218 | __issignalingf128 (__float128 x)
      |                    ^~~~~~~~~~
      |                    _Float128
/vol/gcc/src/hg/master/local/libgfortran/ieee/ieee_helper.c: In function
‘ieee_class_helper_4’:
/vol/gcc/src/hg/master/local/libgfortran/ieee/issignaling_fallback.h:240:13:
error: unknown type name ‘__float128’
  240 |             __float128: __issignalingf128, \
      |             ^~~~~~~~~~
/vol/gcc/src/hg/master/local/libgfortran/ieee/ieee_helper.c:97:11: note: in
expansion of macro ‘issignaling’
   97 |       if (issignaling (*value)) \
      |           ^~~~~~~~~~~
/vol/gcc/src/hg/master/local/libgfortran/ieee/ieee_helper.c:106:1: note: in
expansion of macro ‘CLASSMACRO’
  106 | CLASSMACRO(4)
      | ^~~~~~~~~~
/vol/gcc/src/hg/master/local/libgfortran/ieee/ieee_helper.c: In function
‘ieee_class_helper_8’:
/vol/gcc/src/hg/master/local/libgfortran/ieee/issignaling_fallback.h:240:13:
error: unknown type name ‘__float128’
  240 |             __float128: __issignalingf128, \
      |             ^~~~~~~~~~
/vol/gcc/src/hg/master/local/libgfortran/ieee/ieee_helper.c:97:11: note: in
expansion of macro ‘issignaling’
   97 |       if (issignaling (*value)) \
      |           ^~~~~~~~~~~
/vol/gcc/src/hg/master/local/libgfortran/ieee/ieee_helper.c:107:1: note: in
expansion of macro ‘CLASSMACRO’
  107 | CLASSMACRO(8)
      | ^~~~~~~~~~
/vol/gcc/src/hg/master/local/libgfortran/ieee/ieee_helper.c: In function
‘ieee_class_helper_16’:
/vol/gcc/src/hg/master/local/libgfortran/ieee/issignaling_fallback.h:240:13:
error: unknown type name ‘__float128’
  240 |             __float128: __issignalingf128, \
      |             ^~~~~~~~~~
/vol/gcc/src/hg/master/local/libgfortran/ieee/ieee_helper.c:97:11: note: in
expansion of macro ‘issignaling’
   97 |       if (issignaling (*value)) \
      |           ^~~~~~~~~~~
/vol/gcc/src/hg/master/local/libgfortran/ieee/ieee_helper.c:114:1: note: in
expansion of macro ‘CLASSMACRO’
  114 | CLASSMACRO(16)
      | ^~~~~~~~~~

While __FLT128_IS_IEC_60559__ is defined as 2, __float128 isn't supported on
SPARC.