GNU bug report logs - #53256
Compiling 3.8 with nvhpc 22.1 : malloca.c 64 bits operations with signed and unsigned operands are currently unsupported by __builtin_add_overflow

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Olivier Cessenat <cessenat <at> gmail.com>
Subject: bug#53256: closed (Re: [bug-diffutils] bug#53256: Compiling 3.8
 with nvhpc 22.1 : malloca.c 64 bits operations with signed and unsigned
 operands are currently unsupported by __builtin_add_overflow)
Date: Sat, 15 Jan 2022 03:54:01 +0000

[Message part 1 (text/plain, inline)]

Your bug report

#53256: Compiling 3.8 with nvhpc 22.1 : malloca.c 64 bits operations with signed and unsigned operands are currently unsupported by __builtin_add_overflow

which was filed against the diffutils package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 53256 <at> debbugs.gnu.org.

-- 
53256: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=53256
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Olivier Cessenat <cessenat <at> gmail.com>
Cc: Gnulib bugs <bug-gnulib <at> gnu.org>, 53256-done <at> debbugs.gnu.org
Subject: Re: [bug-diffutils] bug#53256: Compiling 3.8 with nvhpc 22.1 :
 malloca.c 64 bits operations with signed and unsigned operands are currently
 unsupported by __builtin_add_overflow
Date: Fri, 14 Jan 2022 19:53:39 -0800

[Message part 3 (text/plain, inline)]

On 1/14/22 03:33, Olivier Cessenat wrote:
> "diffutils-3.8/lib/malloca.c", line 52: error: 64 bits operations with 
> signed and unsigned operands are currently unsupported by 
> __builtin_add_overflow

Thanks for the bug report. Although nvc 22.1 defines __GNUC__ to be 11 
which means it supports GNU C as of GCC 11, that's obviously untrue for 
__builtin_add_overflow. That's unfortunate. Perhaps you could report 
this as a bug to NVIDIA, as their compiler shouldn't claim to support 
GNU C features that it lacks. nvc can set __GNUC__ to be the version of 
GNU C that it actually does support.

To work around the bug I installed the attached into Gnulib and this 
should appear in the next diffutils release. In the meantime you can 
compile with gcc.

[0001-intprops-work-around-nvc-22.1-bug.patch (text/x-patch, attachment)]

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From: Olivier Cessenat <cessenat <at> gmail.com>
To: bug-diffutils <at> gnu.org
Subject: Compiling 3.8 with nvhpc 22.1 : malloca.c 64 bits operations with
 signed and unsigned operands are currently unsupported by
 __builtin_add_overflow
Date: Fri, 14 Jan 2022 12:33:40 +0100

Hello,

I'm trying to compile diffutils 3.8 with nvc 22.1.

I get an error:

<<

"diffutils-3.8/lib/malloca.c", line 52: error: 64 bits operations with 
signed and unsigned operands are currently unsupported by 
__builtin_add_overflow
    if (!INT_ADD_WRAPV (n, plus, &nplus) && !xalloc_oversized (nplus, 1))
         ^

1 error detected in the compilation of "diffutils-3.8/lib/malloca.c".
>>

It was fine with 3.7.

Thanks for your help.

Olivier Cessenat


Ubuntu 20.04 - compilation still fine with gcc 9.3.0

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