Bug#843210: binutils-multiarch: ar and ranlib generates undeterministic symbol table ar entries

[Guillem Jover]

Control: reassign -1 binutils-multiarch
Control: retitle -1 binutils-multiarch: ar and ranlib generates undeterministic symbol table ar entries

Hi!

It seems the culprit is binutils-multiarch, binutils works just fine.

On Sat, 2016-11-05 at 05:00:19 +0100, Guillem Jover wrote:
> Package: binutils
> Version: 2.27.51.20161102-1
> Severity: important
> X-Debbugs-CC: reproducible-builds at lists.alioth.debian.org

> The ar and ranlib tools generate a symbol table ar entry that is not
> deterministic, which means that any package now in Debian generating
> static libraries will become unreproducible. Here's a transcript of
> a test session:
> 
>   ,---
>   $ cat aa.c
>   int aa(void) { return 10; }
>   $ cat bb.c
>   int bb(void) { return 20; }
>   $ gcc -c -o aa.o aa.c
>   $ gcc -c -o bb.o bb.c
>   $ ar qSf libtest.a aa.o bb.o
>   ar: creating libtest.a
>   $ md5sum libtest.a
>   289a09b22693865dbc80d4a2cc7b379e  libtest.a
>   $ rm libtest.a
>   $ ar qSf libtest.a aa.o bb.o
>   ar: creating libtest.a
>   $ md5sum libtest.a
>   289a09b22693865dbc80d4a2cc7b379e  libtest.a
>   $ ar qf libtest.a aa.o bb.o
>   ar: creating libtest.a
>   $ md5sum libtest.a
>   b9f2b4db76231467df2362d87041fef9  libtest.a
>   $ ranlib libtest.a
>   $ md5sum libtest.a
>   3831575adad5003dfc6cac1a0ec8c8aa  libtest.a
>   $ ranlib -D libtest.a
>   $ md5sum libtest.a
>   23859367b1463bf35d7ab6a0a37eda4b  libtest.a
>   `---
> 
> The ar headers of that last archive are:
> 
>   ,---
>   $ sfile libtest.a
>   file name               : libtest.a
>   file type               : archiver
>   file size               : 2668
>   file offset             : 0 (0)
>   main header type        : Unix/BSD archiver
>    ar header signature    : !<arch>
>   file offset             : 0x8 (8)
>   sub header type         : Unix/BSD archive file entry
>    file name              : /SYM64/
>    file date              : 1478318043   (Sat Nov  5 04:54:03 2016)
>    file uid               : 0
>    file gid               : 0
>    file mode              : 0
>    file size              : 32
>    file signature         : 0x600a
>   file offset             : 0x64 (100)
>   sub header type         : Unix/BSD archive file entry
>    file name              : aa.o/
>    file date              : 0            (Thu Jan  1 01:00:00 1970)
>    file uid               : 0
>    file gid               : 0
>    file mode              : 644
>    file size              : 1224
>    file signature         : 0x600a
>   file offset             : 0x568 (1384)
>   sub header type         : Unix/BSD archive file entry
>    file name              : bb.o/
>    file date              : 0            (Thu Jan  1 01:00:00 1970)
>    file uid               : 0
>    file gid               : 0
>    file mode              : 644
>    file size              : 1224
>    file signature         : 0x600a
>   `---

Thanks,
Guillem