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Re: Rolling new releases


From: David Michael
Subject: Re: Rolling new releases
Date: Thu, 8 Oct 2015 12:55:13 -0400

On Wed, Oct 7, 2015 at 8:17 PM, Samuel Thibault <samuel.thibault@gnu.org> wrote:
> David Michael, le Tue 06 Oct 2015 17:49:00 -0400, a écrit :
>> This one avoids problems with a symbol that is also provided by libpthread:
>> https://anonscm.debian.org/viewvc/pkg-glibc/glibc-package/trunk/debian/patches/hurd-i386/tg-libc_getspecific.diff?view=co
>
> What problem does it actually solve?  Apparently I didn't put enough
> comments to remember what this is about.  AIUI, it should be working
> fine already since this non-weak __libc_getspecific function calls
> cthread_getspecific, which calls pthread_getspecific.

Static linking libpthread doesn't work without it.  The following
commands work with the patch:

$ echo 'int main(){return 42;}' | i686-pc-gnu-gcc -pthread -xc -
$ echo 'int main(){return 42;}' | i686-pc-gnu-gcc -static -pthread -xc -

Without the patch, the second command fails:

$ echo 'int main(){return 42;}' | i686-pc-gnu-gcc -pthread -xc -
$ echo 'int main(){return 42;}' | i686-pc-gnu-gcc -static -pthread -xc -
/usr/i686-pc-gnu/sys-root/lib/libcrt.a(cthreads.o): In function
`__libc_getspecific':
(.text+0x70): multiple definition of `__libc_getspecific'
/usr/i686-pc-gnu/sys-root/lib/libpthread2.a(cthreads-compat.o):(.text+0xd0):
first defined here
collect2: error: ld returned 1 exit status

There may have been other subtle issues with running X or xdm from
this, but I might be thinking of an earlier bad workaround I had...  I
also didn't comment enough to remember the whole story.

Thanks.

David



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