On 2020-12-09 21:38:22 (-0500), Steven Rostedt wrote:
> On Wed,  9 Dec 2020 15:41:36 +0200
> "Yordan Karadzhov (VMware)" <y.karadz@gmail.com> wrote:
> I just realized that the current repo doesn't build against the latest
> libtracefs, because the library's location has moved.  I noticed that
> the CMake files have it hard coded with:
> 
>  find_library(TRACEFS_LIBRARY    NAMES  tracefs/libtracefs.a
>  find_library(TRACEFS_LIBRARY    NAMES  tracefs/libtracefs.so)
> 
> Is there a way to make cmake use pkg-config?
> 
> 	pkg-config --cflags --libs libtracefs
> 
> Will give us the correct includes and libraries for building against
> libtracefs if installed.
> 
> We'll want the same for libtraceevent and libtracecmd as well.

find_package() [1] is usually used for package discovery in cmake-land.
If the NAMES argument is provided it overrides any provided package
name.
In more complex cases (of the package) it is better to have the
package ship with a find_<PACKAGE>.cmake file that will be automatically
used by cmake if it is installed in the system locations.

To use pkg-config/pkgconf directly, it is possible to make use of
the FindPkgConfig [2] module.

Best,
David

P.S.: Out of context: Why is the cmake minimum requirement so low? To
make use of useful features in cmake it needs to be at least 3.4, better
higher even.

[1] https://cmake.org/cmake/help/latest/command/find_package.html#command:find_package
[2] https://cmake.org/cmake/help/latest/module/FindPkgConfig.html

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