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Jonathan Lebon reported an issue to me off-list about a regression in libvirt's configure script, which I traced to a patch that rearranged code that was checking $with_library compared to the AC_ARG_WITH that actually set $with_library [1]. As the whole point of the libvirt patch was to refactor code to make maintenance easier by hiding the AC_ARG_WITH in a helper macro for a net reduction in lines, it makes sense to actually document how to check what value a variable has prior to the AC_ARG_WITH usage. Alas, although the functionality for this has been present in autoconf for ages, the documentation has been lacking. [1] libvirt.org/git/?p=libvirt.git;a=commitdiff;h=654c709 * doc/autoconf.texi (Diversion support) <m4_divert_text>: Add anchor. (External Software) <AC_ARG_WITH>: Demonstrate how to use DEFAULTS diversion, for earlier defaults. (Package Options) <AC_ARG_ENABLE>: Likewise. * THANKS: Add Jonathan Lebon. Signed-off-by: Eric Blake <eblake@redhat.com> |
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| standards.texi | ||