Package is missing major versioned .so file (libgflags.so.2)

[jjhelmus]

The gflags-2.2.0-1.tar.bz2 package is missing the major versioned shared library, libgflags.so.2, containing only the major.minor and major.minor.micro libraries (libgflags.so.2.2 and libgflags.so.2.2.0). The previous version, 2.1.2 contained a major versioned library and a major.minor.micro library (libgflags.so.2 and libgflags.so.2.1.2). Unfortunately many packages link against the major versioned library which cases errors when this file is missing.

~$ tar tf ~/Downloads/gflags-2.1.2-1.tar.bz2 | grep lib/libgflags.so | sort
lib/libgflags.so
lib/libgflags.so.2
lib/libgflags.so.2.1.2
~$ tar tf ~/Downloads/gflags-2.2.0-1.tar.bz2 | grep lib/libgflags.so | sort
lib/libgflags.so
lib/libgflags.so.2.2
lib/libgflags.so.2.2.0

[jakirkham]

Isn't libgflags.so.2 just a symlink to the actual library? So wouldn't packages be linked to libgflags.so.2.1.2?

[jjhelmus]

It looks like this change was intentionally made, gflags/gflags#137. I'll look into a few packages and try to determine why they are linking to libgflags.so.2. The only example I know of at the moment is caffe which is a rather complicated build.

[jakirkham]

It looks like this change was intentionally made, gflags/gflags#137.

Makes sense. Good to know it is not an issue with using CMake.

The only example I know of at the moment is caffe which is a rather complicated build.

Ouch! Thanks for the heads-up.

[jjhelmus]

From my searching the only package in conda-forge that this change seems to effect is caffe. I opened an issue in that feedstock reporting the issue.

There are two options that I see:

1. Update the gflags package to include a symlinked libgflags.so.2 file.
2. Rebuild the caffe package with a gflags >=2.2 requirement and remove the existing builds.

I'm happy to help with either approach.

[jjhelmus]

Should add that both the options above can be applied, they are not mutually exclusive.

[jakirkham]

I'm ok with both options as well. Though the fact that gflags chose to drop libgflags.so.2 seems like a good reason to shy away from relying on it. Rebuilding caffe with gflags 2.2.* would be a good fix. Probably should add this to the pinnings as well. Won't have time to do this myself ATM, but would happily accept PRs for both.

[jjhelmus]

PR #10 Adds libgflags.so.2 to the package.

[advance512]

If you're installing caffe via conda and running into this, try:

conda install python=2.7 caffe-gpu protobuf gflags