Library is not installed to correct dir (lib64) on Debian

[jokva]

As reported in #235, the shared objects are installed in /usr/local/lib, not the correct /lib64.

[jokva]

Ok, so I think I've figured this out.

GNUInstallDirs correctly emits a multi-arch triplet, but only if the install prefix is /usr. This is why this isn't caught in Debian packaging. Ref: Kitware/CMake@620939e

I actually think GNUInstallDirs is correct here, but it'd be nice if the problem didn't show up with default Debian loader settings. My current ldconfig, on a pretty unconfigured Debian Stretch, says:

ldconfig -v 2>/dev/null | grep ':$' |sed -e 's/://'
/usr/lib/x86_64-linux-gnu/libfakeroot
/lib/i386-linux-gnu
/usr/lib/i386-linux-gnu
/usr/local/lib
/lib/x86_64-linux-gnu
/usr/lib/x86_64-linux-gnu
/lib
/usr/lib

[jokva]

... which I just now realise might be because I ran ldconfig.

What's interesting is that the logic that checks for lib vs lib64 doesn't fire on debian, but debian does not set the multiarch triple, and rightly so, unless the prefix is /usr. Meaning GNUInstallDirs never installs to /usr/local/lib64 on Debian.

[jokva]

162c155 references this issue, and I'll close it for now.

If this becomes a problem for you, please open a new issue and let us know, and we'll see if we can work out a solution.