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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@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
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@ -23,6 +23,14 @@ AC_DEFUN([LIBVIRT_ARG_READLINE],[
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AC_DEFUN([LIBVIRT_CHECK_READLINE],[
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# We have to check for readline.pc's presence beforehand because for
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# the longest time the library didn't ship a .pc file at all
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PKG_CHECK_EXISTS([readline], [use_pkgconfig=1], [use_pkgconfig=0])
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if test $use_pkgconfig = 1; then
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# readline 7.0 is the first version which includes pkg-config support
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LIBVIRT_CHECK_PKG([READLINE], [readline], [7.0])
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else
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# This function is present in all reasonable (5.0+) readline versions;
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# however, the macOS base system contains a library called libedit which
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# takes over the readline name despite lacking many of its features. We
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@ -44,6 +52,7 @@ AC_DEFUN([LIBVIRT_CHECK_READLINE],[
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# The normal library check...
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LIBVIRT_CHECK_LIB([READLINE], [readline], [readline], [readline/readline.h])
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fi
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# We need this to avoid compilation issues with modern compilers.
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# See 9ea3424a178 for a more detailed explanation
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