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m4: readline: Comment rl_completion_quote_character() check

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The check was added in 74416b1d4849 without offering any
explanation outside of the commit message. Introduce a comment
to make digging through the git history unnecessary.

Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Andrea Bolognani 2019-04-09 15:56:54 +02:00
parent 765acbe398
commit a9443bc9a9
1 changed files with 6 additions and 0 deletions
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m4/virt-readline.m4
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@ -37,6 +37,12 @@ AC_DEFUN([LIBVIRT_CHECK_READLINE],[
LIBS="$lv_saved_libs $extra_LIBS"
fi
# This function is present in all reasonable (5.0+) readline versions;
# however, the macOS base system contains a library called libedit which
# takes over the readline name despite lacking many of its features. We
# want to make sure we only enable readline support when linking against
# the actual readline library, and the availability of this specific
# functions is as good a witness for that fact as any.
AC_CHECK_DECLS([rl_completion_quote_character],
[], [],
[[#include <stdio.h>