linux-kernel - Re: [PATCH] tools/rtla: Explicitly list libtraceevent dependency

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Message-ID: <20230110150827.chdwhg6h6d4owxai@carbon.lan>
Date:   Tue, 10 Jan 2023 16:08:27 +0100
From:   Daniel Wagner <dwagner@...e.de>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Daniel Bristot de Oliveira <bristot@...nel.org>,
        linux-trace-devel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tools/rtla: Explicitly list libtraceevent dependency

On Tue, Jan 10, 2023 at 09:53:47AM -0500, Steven Rostedt wrote:
> On Tue, 10 Jan 2023 09:51:37 -0500
> Steven Rostedt <rostedt@...dmis.org> wrote:
> 
> > There's many interfaces that require the libtraceevent header files to work
> > with libtracefs. Anything that uses libtracefs must also use libtraceevent,
> > as libtracefs is really just an extension of libtraceevent.

Okay, in this case I am going update the Meson build to add the necessary
explicit dependency:

++ b/src/meson.build
@@ -50,6 +50,7 @@ libtracefs_static = static_library(
 pkg = import('pkgconfig')
 pkg.generate(
     libtracefs,
+    libraries: [libtraceevent_dep],
     subdirs: 'libtracefs',
     filebase: meson.project_name(),
     name: meson.project_name(),


$ cat /tmp/trace-cmd/lib64/pkgconfig/libtracefs.pc
prefix=/tmp/trace-cmd
includedir=${prefix}/include
libdir=${prefix}/lib64

Name: libtracefs
Description: Manage trace fs
URL: https://git.kernel.org/pub/scm/libs/libtrace/libtracefs.git/
Version: 1.6.3
Requires: libtraceevent >=  1.7.0
Libs: -L${libdir} -ltracefs
Cflags: -I${includedir}/libtracefs

$ PKG_CONFIG_PATH=/tmp/trace-cmd
$ pkg-config --libs libtracefs
-L/tmp/trace-cmd/lib64 -ltracefs -ltraceevent