Bug#1115395: dpkg-shlibdeps fails to find libraries if /lib is removed from ld.so.conf search path

[Aurelien Jarno]

Hi,

On 2025-09-16 23:57, Michael Biebl wrote:
> Hi Guillem
> 
> Am 16.09.25 um 23:46 schrieb Guillem Jover:
> 
> > This can be reproduced on a system with a merged-/usr with selective
> > filename aliasing (instead of global directory aliasing).
> > 
> > The problem is that merged-/usr with directory aliasing has been
> > shadowing this problem, which is a packaging issue in libgctp. The
> > non-dev package should be containing the shared library named as its
> > SONAME, which is what dpkg-shlibdeps expects, to be able to map from
> > the SONAME to the package that contains the shlibs file.
> > 
> > This has worked on merged-/usr systems with directory aliasing (and
> > /lib in the ld.so default path) because dpkg-shlibdeps was able to
> > find the file on the filesystem but no match on its db, which
> > resulted in triggering a fallback to canonicalize the filename and
> > overwrite the filename to package mapping which then leads it to the
> > package containing the shlibs file (libgctp-2.0.0 vs libgctp-dev).
> > 
> > On systems where there is no searching or presence of SONAME via /lib,
> > then dpkg-shlibdeps does not trigger the canonicalization and instead
> > finds the mapping to the -dev package, which contains no shlibs file,
> > and that fails the build.
> > 
> > The attached patch should fix the issue (at least it does for me).
> > Reassigning to libgctp.
> 
> Thanks a lot for the detailed explanation (and the patch)!
> 
> 
> Looping in Aurelien as well so he is aware that there is now a fix for this
> issue and should not block this glibc change being uploaded to unstable.

Thanks a lot for the investigation and the patch.

Aurelien

-- 
Aurelien Jarno                          GPG: 4096R/1DDD8C9B
aurelien at aurel32.net                     http://aurel32.net
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