[Bug c/97916] New: Can't compile gcc-10.2.0 with --enable-fixed-point

[Bug c/97916] New: Can't compile gcc-10.2.0 with --enable-fixed-point

[sbenzel at acm dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97916

            Bug ID: 97916
           Summary: Can't compile gcc-10.2.0 with --enable-fixed-point
           Product: gcc
           Version: 10.2.0
            Status: UNCONFIRMED
          Keywords: build
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: sbenzel at acm dot org
  Target Milestone: ---

Received the following error when trying to build gcc-10.2.0 with fixed point
support using gcc-10.2.0 on 
$uname --all
Linux WorkStation 5.9.9-arch1-1 #1 SMP PREEMPT Wed, 18 Nov 2020 19:52:04 +0000
x86_64 GNU/Linux

configured with

../gcc-10.2.0/configure --prefix=/home/jonny --enable-fixed-point
--disable-multilib --build=x86_64-unknown-linux-gnu --enable-languages=c

[Bug c/97916] Can't compile gcc-10.2.0 with --enable-fixed-point

[sbenzel at acm dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97916

--- Comment #1 from Steven Benzel <sbenzel at acm dot org> ---
/home/jonny/work/gcc_build/./gcc/xgcc -B/home/jonny/work/gcc_build/./gcc/
-B/home/jonny/x86_64-unknown-linux-gnu/bin/
-B/home/jonny/x86_64-unknown-linux-gnu/lib/ -isystem
/home/jonny/x86_64-unknown-linux-gnu/include -isystem
/home/jonny/x86_64-unknown-linux-gnu/sys-include   -fno-checking -g -O2 -O2  -g
-O2 -DIN_GCC    -W -Wall -Wno-narrowing -Wwrite-strings -Wcast-qual
-Wno-error=format-diag -Wno-format -Wstrict-prototypes -Wmissing-prototypes
-Wno-error=format-diag -Wold-style-definition  -isystem ./include  -fpic
-mlong-double-80 -DUSE_ELF_SYMVER  -g -DIN_LIBGCC2 -fbuilding-libgcc
-fno-stack-protector  -fpic -mlong-double-80 -DUSE_ELF_SYMVER  -I. -I.
-I../.././gcc -I../../../gcc-10.2.0/libgcc -I../../../gcc-10.2.0/libgcc/.
-I../../../gcc-10.2.0/libgcc/../gcc -I../../../gcc-10.2.0/libgcc/../include
-I../../../gcc-10.2.0/libgcc/config/libbid -DENABLE_DECIMAL_BID_FORMAT
-DHAVE_CC_TLS  -DUSE_TLS -o _addQQ.o -MT _addQQ.o -MD -MP -MF _addQQ.dep
-DL_add -DQQ_MODE -c ../../../gcc-10.2.0/libgcc/fixed-bit.c -fvisibility=hidden
-DHIDE_EXPORTS
In file included from ../../../gcc-10.2.0/libgcc/fixed-bit.c:55:
../../../gcc-10.2.0/libgcc/fixed-bit.h:64:1: error: unable to emulate ‘QQ’
   64 | typedef          _Fract QQtype  __attribute__ ((mode (QQ)));
      | ^~~~~~~
../../../gcc-10.2.0/libgcc/fixed-bit.h:65:1: error: unable to emulate ‘UQQ’
   65 | typedef unsigned _Fract UQQtype __attribute__ ((mode (UQQ)));
      | ^~~~~~~
../../../gcc-10.2.0/libgcc/fixed-bit.h:66:1: error: unable to emulate ‘HQ’
   66 | typedef          _Fract HQtype  __attribute__ ((mode (HQ)));
      | ^~~~~~~
../../../gcc-10.2.0/libgcc/fixed-bit.h:67:1: error: unable to emulate ‘UHQ’
   67 | typedef unsigned _Fract UHQtype __attribute__ ((mode (UHQ)));
      | ^~~~~~~
../../../gcc-10.2.0/libgcc/fixed-bit.h:68:1: error: unable to emulate ‘HA’
   68 | typedef          _Fract HAtype  __attribute__ ((mode (HA)));
      | ^~~~~~~
../../../gcc-10.2.0/libgcc/fixed-bit.h:69:1: error: unable to emulate ‘UHA’
   69 | typedef unsigned _Fract UHAtype __attribute__ ((mode (UHA)));
      | ^~~~~~~
../../../gcc-10.2.0/libgcc/fixed-bit.h:84:1: error: unable to emulate ‘SQ’
   84 | typedef          _Fract SQtype  __attribute__ ((mode (SQ)));
      | ^~~~~~~
../../../gcc-10.2.0/libgcc/fixed-bit.h:85:1: error: unable to emulate ‘USQ’
   85 | typedef unsigned _Fract USQtype __attribute__ ((mode (USQ)));
      | ^~~~~~~
../../../gcc-10.2.0/libgcc/fixed-bit.h:86:1: error: unable to emulate ‘SA’
   86 | typedef          _Fract SAtype  __attribute__ ((mode (SA)));
      | ^~~~~~~
../../../gcc-10.2.0/libgcc/fixed-bit.h:87:1: error: unable to emulate ‘USA’
   87 | typedef unsigned _Fract USAtype __attribute__ ((mode (USA)));
      | ^~~~~~~
../../../gcc-10.2.0/libgcc/fixed-bit.h:98:1: error: unable to emulate ‘DQ’
   98 | typedef          _Fract DQtype  __attribute__ ((mode (DQ)));
      | ^~~~~~~
../../../gcc-10.2.0/libgcc/fixed-bit.h:99:1: error: unable to emulate ‘UDQ’
   99 | typedef unsigned _Fract UDQtype __attribute__ ((mode (UDQ)));
      | ^~~~~~~
../../../gcc-10.2.0/libgcc/fixed-bit.h:100:1: error: unable to emulate ‘DA’
  100 | typedef          _Fract DAtype  __attribute__ ((mode (DA)));
      | ^~~~~~~
../../../gcc-10.2.0/libgcc/fixed-bit.h:101:1: error: unable to emulate ‘UDA’
  101 | typedef unsigned _Fract UDAtype __attribute__ ((mode (UDA)));
      | ^~~~~~~
../../../gcc-10.2.0/libgcc/fixed-bit.h:112:1: error: unable to emulate ‘TQ’
  112 | typedef          _Fract TQtype  __attribute__ ((mode (TQ)));
      | ^~~~~~~
../../../gcc-10.2.0/libgcc/fixed-bit.h:113:1: error: unable to emulate ‘UTQ’
  113 | typedef unsigned _Fract UTQtype __attribute__ ((mode (UTQ)));
      | ^~~~~~~
../../../gcc-10.2.0/libgcc/fixed-bit.h:114:1: error: unable to emulate ‘TA’
  114 | typedef          _Fract TAtype  __attribute__ ((mode (TA)));
      | ^~~~~~~
../../../gcc-10.2.0/libgcc/fixed-bit.h:115:1: error: unable to emulate ‘UTA’
  115 | typedef unsigned _Fract UTAtype __attribute__ ((mode (UTA)));
      | ^~~~~~~
../../../gcc-10.2.0/libgcc/fixed-bit.c: In function ‘__addqq3’:
../../../gcc-10.2.0/libgcc/fixed-bit.c:60:1: internal compiler error: in
classify_argument, at config/i386/i386.c:2435
   60 | {
      | ^
0x17d155e classify_argument
        ../../gcc-10.2.0/gcc/config/i386/i386.c:2435
0x17d16e6 examine_argument
        ../../gcc-10.2.0/gcc/config/i386/i386.c:2459
0x17d57b2 ix86_return_in_memory
        ../../gcc-10.2.0/gcc/config/i386/i386.c:3826
0xd5fcbe aggregate_value_p(tree_node const*, tree_node const*)
        ../../gcc-10.2.0/gcc/function.c:2111
0xd698a3 allocate_struct_function(tree_node*, bool)
        ../../gcc-10.2.0/gcc/function.c:4814
0x901a24 store_parm_decls()
        ../../gcc-10.2.0/gcc/c/c-decl.c:9781
0x968cfb c_parser_declaration_or_fndef
        ../../gcc-10.2.0/gcc/c/c-parser.c:2466
0x96713c c_parser_external_declaration
        ../../gcc-10.2.0/gcc/c/c-parser.c:1745
0x966c8a c_parser_translation_unit
        ../../gcc-10.2.0/gcc/c/c-parser.c:1618
0x9a73bc c_parse_file()
        ../../gcc-10.2.0/gcc/c/c-parser.c:21745
0xa32818 c_common_parse_file()
        ../../gcc-10.2.0/gcc/c-family/c-opts.c:1190
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
make[3]: *** [../../../gcc-10.2.0/libgcc/fixed-obj.mk:27: _addQQ.o] Error 1
make[3]: Leaving directory
'/home/jonny/work/gcc_build/x86_64-unknown-linux-gnu/libgcc'
make[2]: *** [Makefile:19173: all-stage1-target-libgcc] Error 2
make[2]: Leaving directory '/home/jonny/work/gcc_build'
make[1]: *** [Makefile:23439: stage1-bubble] Error 2
make[1]: Leaving directory '/home/jonny/work/gcc_build'
make: *** [Makefile:999: all] Error 2

[Bug bootstrap/97916] Can't compile gcc-10.2.0 with --enable-fixed-point

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97916

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|c                           |bootstrap
             Target|                            |x86_64-unknown-linux-gnu
           Keywords|                            |documentation

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
fixed point support is only supported on a few targets, MIPS is one of them.
The documentation should be clearier that it is not supported on others.

[Bug bootstrap/97916] Can't compile gcc-10.2.0 with --enable-fixed-point

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97916

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|documentation               |
   Last reconfirmed|                            |2020-11-19
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |SUSPENDED

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
There was a RFC about enabling it for x86 last year but since the ABI was not
official nothing was done able it.  I don't know if the person followed up with
the recomended way of getting the ABI agreeded upon either.

https://gcc.gnu.org/pipermail/gcc/2019-September/230445.html

Suspended until the ABI documentation is done with.

[Bug bootstrap/97916] Can't compile gcc-10.2.0 with --enable-fixed-point

[egallager at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97916

Eric Gallager <egallager at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |egallager at gcc dot gnu.org
             Status|SUSPENDED                   |RESOLVED
         Resolution|---                         |DUPLICATE

--- Comment #4 from Eric Gallager <egallager at gcc dot gnu.org> ---
I think this is a dup of bug 34422

*** This bug has been marked as a duplicate of bug 34422 ***