Marius Bakke <mba...@fastmail.com> writes: > Ludovic Courtès <l...@gnu.org> writes: > >> Marius Bakke <mba...@fastmail.com> skribis: >> >>> Efraim Flashner <efr...@flashner.co.il> writes: >>> >>>> On Wed, Aug 30, 2017 at 09:10:42PM +0200, Marius Bakke wrote: >>>>> Since we're on the topic, I would like to switch to GCC 6 or 7 soon... >>>>> Are we agile enough to use the very latest GCC by default yet? :-) >>>> >>>> That would be nice to at least move to GCC 6. My aarch64 board is >>>> currently idle, I can see how well it works on my machine. >>> >>> The main issue with GCC 6 is that we need to port the SOURCE_DATE_EPOCH >>> patches again. But we might want to do that even if switching to 7. >> >> I think we should upgrade. My preference would be GCC 6, which I think >> may trigger fewer build failures than GCC 7, but maybe GCC 7 would be >> fine. >> >> Are you sure the SOURCE_DATE_EPOCH thing isn’t already in GCC 6? > > I just checked out the gcc-6_4_0-release tag and ran `git grep > SOURCE_DATE_EPOCH`. No results :/ > > However I tried cherry-picking the two commits and there was only one > trivial conflict in gcc/c-family/c-common.h (apart from ChangeLog > updates, which were omitted). Patch attached and building!
It works!
$ cat sde.c
#include <stdio.h>
int main()
{
printf( "__DATE__ says: %s \n", __DATE__ );
printf( "__TIME__ says: %s \n", __TIME__ );
return 0;
}
$ ./pre-inst-env guix environment --pure --ad-hoc gcc@6 binutils glibc
bash: tty: command not found
[env]$ gcc sde.c && ./a.out
__DATE__ says: Aug 31 2017
__TIME__ says: 17:09:07
[env]$ SOURCE_DATE_EPOCH=1 gcc sde.c && ./a.out
__DATE__ says: Jan 1 1970
__TIME__ says: 00:00:01
[env]$ SOURCE_DATE_EPOCH=-1 gcc sde.c && ./a.out
sde.c: In function 'main':
sde.c:4:5: error: environment variable SOURCE_DATE_EPOCH must expand to a
non-negative integer less than or equal to 253402300799
printf( "__DATE__ says: %s \n", __DATE__ );
^~~~~~
\o/
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