cross compilation pkg-conf and path prefixing

Describe the bug I got a sysroot folder (an armv7 host) with some dependencies for pkg-conf to find. Eg x11.pc. And I’ve got another folder with dependencies that are NOT inside the sysroot, eg. webrtc.pc. So currently I got the following meson cross file:

[binaries]
cpp = 'clang++'
ar = 'llvm-ar'
strip = 'llvm-strip'

[built-in options]
cpp_args = [
  '--sysroot', '<absolute>/sysroot',
  '-target', 'arm-linux-gnueabihf',
  ]
cpp_link_args = [
  '--sysroot', '<absolute>/sysroot',
  '-Wl,-rpath=/usr/lib/arm-linux-gnueabihf',
  '-Wl,-rpath=/lib/arm-linux-gnueabihf',
  '-latomic',
  '-target', 'arm-linux-gnueabihf',
  ]

[properties]
# sets PKG_CONFIG_SYSROOT_DIR
sys_root = '<absolute>/sysroot'
# sets PKG_CONFIG_LIBDIR
pkg_config_libdir = [
  '<absolute>/sysroot/usr/share/pkgconfig',
  '<absolute>/sysroot/usr/lib/arm-linux-gnueabihf/pkgconfig',
  '<absolute>/sysroot/usr/lib/pkgconfig',
  '<absolute>/dependencies' # <-- PROBLEM!!!!
  ]

[host_machine]
system = 'linux'
cpu_family = 'arm'
cpu = 'armv7'
endian = 'little'

Now the issues is, that pkgconf PREFIXES every path in the *.pc files inside dependencies with the sysroot defined in sys_root.

However the paths defined pc files in the folder dependencies MUST not be prefixed. Else the #include and linking will fail.

However the prefixing is needed for the pc files found inside the sysroot.

How do I resolve this? Any tips or hints?

system parameters

• linux
• meson --version: 0.57.1

[xclaesse]

Right, as I said in https://todo.sr.ht/~kaniini/pkgconf/20, pkgconf and pkg-config both add sysroot prefix to -uninstalled.pc files too, which never make sense AFAIK.

[qwertzui11]

Yeah, looks like it!

Okay, I’m gonna hack a solution by adding softlinks into the sysroot. So the prefix becomes valid. I’m gonna wait for #7650 and refactor afterwards.

No wonder cmake did the <package>-config.cmake stuff, combined with three variables on how to interpret these.

Thx for your feedback and time.