llvm-config --ld-flags does not give the correct library path

[llvmbot]

Bugzilla Link	11537
Resolution	WORKSFORME
Resolved on	May 15, 2012 15:29
Version	unspecified
OS	Linux
Attachments	llvm configure log
Reporter	LLVM Bugzilla Contributor

Extended Description

When using llvm-config --ldflags, the program returns -L/usr/lib instead of the correct location of the llvm libraries (/usr/lib/llvm in my case).
According to baldrick, this may be due to llvm-config assuming the libs would be install under --prefix, rather than --libdir.

Attached is the config.log from my llvm build.

[llvmbot]

Can you say whether this is a regression or not?

It looks to me like this is something that never worked, but I just rewrote llvm-config so I want to make sure it isn't a bug I introduced.

[llvmbot]

Definitely a regression, it worked with older versions of llvm (last update before this one was about a month ago, always using llvm from svn).

[llvmbot]

Ok, I will investigate.

Can you show me how you configure LLVM?

[llvmbot]

llvm-9999 ebuild from gentoo portage
As I said, I use the gentoo ebuild to install llvm, which takes care of all the configuring. I attached the ebuild, maybe that can help you.

[llvmbot]

Oh, quaint. Gentoo's ebuild seems to think running sed scripts on the LLVM build post configure is a good idea. This is completely unsupported.

Gentoo should file bugs to get configure to honor the appropriate arguments and change their scripts. Munging our internal makefiles to get whatever behavior they want is fragile and I'm not particularly sympathetic to it.

I reviewed the old llvm-config again, and I see no evidence that it would have supported the kind of munging that Gentoo is doing. I would put in a fix for this in the new llvm-config if it was trivial, but it isn't.

Note that LLVM's build script does not support any of the "fine tuning" configure options like --bindir, --libdir, --includedir.

I am closing this as cannot reproduce, because it isn't possible to reproduce using the supported setup (configure + make).

If you really want this to be fixed, please open an enhancement request for us to properly support --libdir etc.