Bug 96941

Summary:	pkg-config outputs empty library search path for cblas on Arch
Product:	pkg-config	Reporter:	Roukun <liminglangjun>
Component:	src	Assignee:	pkg-config
Status:	RESOLVED NOTOURBUG	QA Contact:
Severity:	normal
Priority:	medium
Version:	unspecified
Hardware:	All
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:

Description Roukun 2016-07-15 15:38:09 UTC

On Arch, pkg-config gives redundant '-L' for cblas installed from the official repository.

$ pkg-config --libs cblas 
-L -lcblas -lblas

The '-L' without arguments will potentially break the building of any program that uses 
pkg-config to find the search paths for cblas. It seems that GCC treats '-lcblas' as the
argument of '-L' and thus the final executable will not get linked to cblas.

Additional info:
* pkg-config: 0.29.1, gcc: 6.1.1

Comment 1 Dan Nicholson 2016-08-22 22:08:03 UTC

Can you show the contents of cblas.pc?

Comment 2 Roukun 2016-08-24 03:17:27 UTC

(In reply to Dan Nicholson from comment #1)
> Can you show the contents of cblas.pc?

prefix=
libdir=

Name: lapacke
Description: C Standard Interface to BLAS Linear Algebra PACKage
Version: 3.6.1
URL: http://www.netlib.org/lapack/
Libs: -L -lcblas
Requires: blas

Comment 3 Dan Nicholson 2016-08-24 03:55:30 UTC

Well, it looks like pkg-config is doing what it was asked to do and the bug is in the construction of cblas.pc. You see the Libs: -L, right? Maybe we could add code to check that there was actually an argument, but that hasn't been needed to this point. Sorry, but I think the bug is somewhere else.

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