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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Message #10 received at 53256-done <at> debbugs.gnu.org (full text, mbox):

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 1 (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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