[Bug c/65833] New: Attempting to convert 128 bit integers to 128 bit decimal floating-point results in an unresolved symbol

mm at mezzarobba dot net gcc-bugzilla@gcc.gnu.org
Tue Apr 21 14:15:00 GMT 2015


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65833

            Bug ID: 65833
           Summary: Attempting to convert 128 bit integers to 128 bit
                    decimal floating-point results in an unresolved symbol
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mm at mezzarobba dot net
                CC: christoph.lauter at lip6 dot fr

The following code

$ cat stitd.c
int main(void) {
    __uint128_t foo = 42;
    _Decimal128 bar = foo;
    (void) bar;
    return 0;
}

fails to link with

$ gcc -Wall -Wextra -std=gnu11 stitd.c
/tmp/ccY4noUz.o: In function `main':
stitd.c:(.text+0x27): undefined reference to `__bid_floatunstitd'
collect2: error: ld returned 1 exit status
(exit 1) 

Changing __uint128_t to __int128_t results in a similar error. Replacing
_Decimal128 by __float128 works.

~/docs/vrac/c$ gcc -v --version
Using built-in specs.
COLLECT_GCC=/usr/bin/gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.9/lto-wrapper
gcc (Debian 4.9.2-10) 4.9.2
Copyright (C) 2014 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.


Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 4.9.2-10'
--with-bugurl=file:///usr/share/doc/gcc-4.9/README.Bugs
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Thread model: posix
gcc version 4.9.2 (Debian 4.9.2-10) 
COLLECT_GCC_OPTIONS='-v' '--version' '-mtune=generic' '-march=x86-64'
 /usr/lib/gcc/x86_64-linux-gnu/4.9/cc1 -quiet -v -imultiarch x86_64-linux-gnu
help-dummy -quiet -dumpbase help-dummy -mtune=generic -march=x86-64 -auxbase
help-dummy -version --version -o /tmp/cc2dxKl2.s
GNU C (Debian 4.9.2-10) version 4.9.2 (x86_64-linux-gnu)
        compiled by GNU C version 4.9.2, GMP version 6.0.0, MPFR version
3.1.2-p3, MPC version 1.0.2
warning: MPFR header version 3.1.2-p3 differs from library version 3.1.2-p11.
warning: MPC header version 1.0.2 differs from library version 1.0.3.
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
COLLECT_GCC_OPTIONS='-v' '--version' '-mtune=generic' '-march=x86-64'
 as -v --64 --version -o /tmp/ccNgVCKN.o /tmp/cc2dxKl2.s
GNU assembler version 2.25 (x86_64-linux-gnu) using BFD version (GNU Binutils
for Debian) 2.25
GNU assembler (GNU Binutils for Debian) 2.25
Copyright (C) 2014 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License version 3 or later.
This program has absolutely no warranty.
This assembler was configured for a target of `x86_64-linux-gnu'.
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LIBRARY_PATH=/usr/lib/gcc/x86_64-linux-gnu/4.9/:/usr/lib/gcc/x86_64-linux-gnu/4.9/../../../x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/4.9/../../../../lib/:/lib/x86_64-linux-gnu/:/lib/../lib/:/usr/lib/x86_64-linux-gnu/:/usr/lib/../lib/:/usr/lib/gcc/x86_64-linux-gnu/4.9/../../../:/lib/:/usr/lib/
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collect2 version 4.9.2
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/usr/lib/gcc/x86_64-linux-gnu/4.9/../../../x86_64-linux-gnu/crtn.o
GNU ld (GNU Binutils for Debian) 2.25
Copyright (C) 2014 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License version 3 or (at your option) a later version.
This program has absolutely no warranty.



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