Your message dated Tue, 23 Jun 2015 07:24:48 +0000 with message-id <E1Z7IZc-0001tY-Ii@franck.debian.org> and subject line Bug#789156: Removed package(s) from unstable has caused the Debian Bug report #721720, regarding -floop-parallelize-all misleadingly accepted to be marked as done. This means that you claim that the problem has been dealt with. If this is not the case it is now your responsibility to reopen the Bug report if necessary, and/or fix the problem forthwith. (NB: If you are a system administrator and have no idea what this message is talking about, this may indicate a serious mail system misconfiguration somewhere. Please contact owner@bugs.debian.org immediately.) -- 721720: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=721720 Debian Bug Tracking System Contact owner@bugs.debian.org with problems
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- To: submit@bugs.debian.org
- Subject: -floop-parallelize-all misleadingly accepted
- From: Zefram <zefram@fysh.org>
- Date: Tue, 3 Sep 2013 14:14:35 +0100
- Message-id: <20130903131435.GS31643@fysh.org>
Package: gcc-4.7 Version: 4.7.2-5 Severity: normal There's a funny arrangement for gcc's -floop-parallelize-all option (and it looks like some related options too) where it's always accepted, but the optimisation mechanism that it controls depends on an optional library package being installed. This turns out to make it difficult to detect whether the optimisation is really available. I've run into this with building libmemcached from source. I'm doing this independent of the Debian libmemcached package, actually as part of the Perl module Memcached::libmemcached, which I'm building from CPAN on a non-system Perl. The gcc in question is targeting x86_64-linux-gnu. The library has an autoconf configure script. I can simulate the relevant test this way: $ cat t.c int main() { return 0; } $ gcc-4.7 -O2 -floop-parallelize-all -c t.c && echo OK OK As the option is accepted, it's used in compilation of the library code. Compilation of a couple of the modules then fails. I can demonstrate this with an eviscerated version of the library's CRC32 code: $ cat c.c static const int crc32tab[256] = {}; int c(const char *key, int key_length) { int x; int crc= ~0; for (x= 0; x < key_length; x++) crc= (crc >> 8) ^ crc32tab[(crc ^ key[x]) & 0xff]; return ((~crc) >> 16) & 0x7fff; } $ gcc-4.7 -O2 -floop-parallelize-all -c c.c && echo OK c.c: In function 'c': c.c:2:5: sorry, unimplemented: Graphite loop optimizations can only be used if the libcloog-ppl0 package is installed I've advised the Perl module maintainer that the configure test ought to include some complex loop code in order to properly trigger failure. Bug report for that module is at <https://rt.cpan.org/Ticket/Display.html?id=88378>. But I think that this problem should be addressed in the Debian gcc. The simple configure test *should* work. There's a practical problem in determining what complexity of code is required for the test; this is liable to vary between gcc versions and between target architectures. In principle, I think it's wrong for gcc to accept an option when its only effect will be to later break compilation. The option should be rejected up front if its implementation is not available. -zefram
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- Cc: gcc-4.7@packages.debian.org, gcc-4.7@packages.qa.debian.org
- Subject: Bug#789156: Removed package(s) from unstable
- From: Debian FTP Masters <ftpmaster@ftp-master.debian.org>
- Date: Tue, 23 Jun 2015 07:24:48 +0000
- Message-id: <E1Z7IZc-0001tY-Ii@franck.debian.org>
Version: 4.7.4-3+rm Dear submitter, as the package gcc-4.7 has just been removed from the Debian archive unstable we hereby close the associated bug reports. We are sorry that we couldn't deal with your issue properly. For details on the removal, please see https://bugs.debian.org/789156 The version of this package that was in Debian prior to this removal can still be found using http://snapshot.debian.org/. This message was generated automatically; if you believe that there is a problem with it please contact the archive administrators by mailing ftpmaster@ftp-master.debian.org. Debian distribution maintenance software pp. Luca Falavigna (the ftpmaster behind the curtain)
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