I updated the Impact and Test Case sections of this bug's description. I
hope this better fits the purpose of describing the actual impact on
users.
** Description changed:
Impact
======
- libgif-dev in Ubuntu 14.04 LTS depends on libgif4 and has these symlinks:
- /usr/lib/libungif.a -> libgif.a
- /usr/lib/libungif.so -> libgif.so.4.1.6
- /usr/lib/x86_64-linux-gnu/libgif.so -> libgif.so.4.1.6
- /usr/lib/libungif.la -> libgif.la
-
- libgif4 has these files:
- /usr/lib/x86_64-linux-gnu/libgif.so.4.1.6
- /usr/lib/x86_64-linux-gnu/libgif.so.4 -> libgif.so.4.1.6
-
- Only the 3rd symlink (the multiarch one) in libgif-dev is correct. The
- others are dangling.
-
- This was caused by an obsolete debian/libgif-dev.links
+ Linking programs that need libungif ("-lungif") will fail.
Test Case
=========
- Verify that libgif-dev only includes the one working symlink:
- /usr/lib/x86_64-linux-gnu/libgif.so -> libgif.so.4.1.6
+ apt-get install build-essential libgif-dev
+ cat >>test.c EOF
+ int main(int argc, char **argv) {
+ return 0;
+ }
+ EOF
+ gcc -lungif test.c
+
+ GCC will fail with "/usr/bin/ld: cannot find -lungif" on affected
+ systems.
Regression Potential
====================
None, just removing some dangling symlinks that couldn't work any way.
Original Bug Report
===================
In Ubuntu 14.04 LTS on x86_64 I am experiencing the following bug in
libgif-dev 4.1.6-11:
Symbol links for libungif.a, libungif.la, and libungif.so are created in
/usr/lib that point to libgif.a, libgif.la and libgif.so.4.1.6
respectively. However, these files are not in /usr/lib but in
/usr/lib/x86_64-linux-gnu. Therefore, the symbol links are invalid.
I suggest fixing this by placing the symbol links in the same directory
as the target files.
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https://bugs.launchpad.net/bugs/1337898
Title:
Invalid symlinks for libungif.so and libungif.a
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