Re: [libvirt] [PATCH v2 6/7] m4: readline: Use pkg-config where possible

With the 7.0 release, readline has finally started shipping pkg-config support in the form of a readline.pc file. Unfortunately, most downstreams have yet to catch up with this change: among Linux distributions in particular, Fedora Rawhide seems to be the only one installing it at the moment. Non-Linux operating systems have been faring much better in this regard: both FreeBSD (through ports) and macOS (through homebrew) include pkg-config support in their readline package. This is great news for us, since those are the platforms where pkg-config is more useful on account of them installing headers and libraries outside of the respective default search paths. Our implementation checks whether readline is registered as a pkg-config package, and if so obtains CFLAGS and LIBS using the tool; if not, we just keep using the existing logic. This commit is best viewed with 'git show -w'. Signed-off-by: Andrea Bolognani <abologna(a)redhat.com&gt; --- m4/virt-readline.m4 | 47 +++++++++++++++++++++++++++------------------ 1 file changed, 28 insertions(+), 19 deletions(-)