GNU bug report logs - #53647
__TIMESTAMP__ CPP macro not honoring SOURCE_EPOCH_DATE

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Package: guix;

Reported by: Maxim Cournoyer <maxim.cournoyer <at> gmail.com>

Date: Mon, 31 Jan 2022 05:23:02 UTC

Severity: normal

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Report forwarded to bug-guix <at> gnu.org:
bug#53647; Package guix. (Mon, 31 Jan 2022 05:23:02 GMT) Full text and rfc822 format available.
Acknowledgement sent to Maxim Cournoyer <maxim.cournoyer <at> gmail.com>:
New bug report received and forwarded. Copy sent to bug-guix <at> gnu.org. (Mon, 31 Jan 2022 05:23:02 GMT) Full text and rfc822 format available.

Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Maxim Cournoyer <maxim.cournoyer <at> gmail.com>
To: bug-guix <bug-guix <at> gnu.org>
Subject: __TIMESTAMP__ CPP macro not honoring SOURCE_EPOCH_DATE
Date: Mon, 31 Jan 2022 00:22:19 -0500

Hello,

Maxim Cournoyer <maxim.cournoyer <at> gmail.com> writes:

> * gnu/packages/electronics.scm (openboardview): New variable.

I've found a source of nondeterminism in the build of openboardview: the
use of the CPP __TIMESTAMP__ macro (info '(cpp) Common Predefined
Macros').  It seems that GCC 10.3.0 still doesn't doesn't honor
SOURCE_EPOCH_DATE for that macro.  A patch was made to correct this, but
it seems it was never applied [0].  I've ping'd in the #gcc channel to
verify.

I haven't seen the patch carried by Debian for their GCC package.

Thanks,

Maxim

[0]  https://gcc.gnu.org/pipermail/gcc-patches/2016-November/461108.html
This bug report was last modified 2 years and 352 days ago.

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