Generate and install pkg-config file

[gavv]

scons install should generate and install a libroc.pc file for pkg-config.

The file contents should be something like:

prefix=/usr
exec_prefix=${prefix}
libdir=/usr/lib64
includedir=${prefix}/include

Name: libroc
Requires: libuv libunwind
Version: 0.1.3
Description: Real-time audio streaming over the network.
URL: https://roc-project.github.io

Libs: -L${libdir} -lroc -lrt -lpthread -lnsl -ldl -lm
Cflags: -I${includedir}

But paths (/usr, /usr/lib64), version (0.1.3), and dependencies (libuv libunwind) should be generated dynamically according to the .version file, installation prefix, and enabled dependencies. All this info is already available inside scons.

The file itself should be installed accordingly to the installation prefix and pkg-config default path. On my system it is /usr/lib64/pkgconfig.

The generation function should be added somewhere under site_scons/site_tools/roc. This is our scons plugin which provided various helpers.

This task is needed for our Go bindings: https://github.com/roc-project/roc-go/issues/4

[fusuiyi123]

if I understand correctly, we need to create a libroc.pc file in PKG_CONFIG_PATH and prefix, libdir requires are from scons options --prefix=PREFIX, --libdir=LIBDIR, not sure where do we get enabled dependencies, is it https://github.com/roc-project/roc/blob/master/SConstruct#L732 ? Thanks!

[fusuiyi123]

and it's just writing a file to a path like /usr/lib64/pkgconfig not AddDistFile which is installing a target library..?

[gavv]

if I understand correctly, we need to create a libroc.pc file in PKG_CONFIG_PATH and prefix, libdir requires are from scons options --prefix=PREFIX, --libdir=LIBDIR

Yes.

not sure where do we get enabled dependencies, is it https://github.com/roc-project/roc/blob/master/SConstruct#L732 ?

Yes. We should add dependencies which are:

• listed in system_dependencies
• added to env using ParsePkgConfig (which also defined the pkg-config dependency name)
• are dependencies of libroc, not just of roc tools or pulseaudio modules (like sox, for example)

and it's just writing a file to a path like /usr/lib64/pkgconfig not AddDistFile which is installing a target library..?

I think we should add an AlwaysBuild action that generates libroc.pc file somewhere in the build directory and then add this file to the install target using AddDistFile()

[fusuiyi123]

thank you, I sent a pr #347

[gavv]

Merged.