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build: add configure --without-readline

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Make it much easier to test a configuration built without readline
support, by reusing our existing library probe machinery.  It gets
a bit tricky with readline, which does not provide a pkg-config
snippet, and which on some platforms requires one of several
terminal libraries as a prerequiste, but the end result should be
the same default behavior but now with the option to disable things.

* m4/virt-readline.m4 (LIBVIRT_CHECK_READLINE): Simplify by using
LIBVIRT_CHECK_LIB.
* tools/virsh.c: Convert USE_READLINE to WITH_READLINE.

Signed-off-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Eric Blake 2013-10-04 11:51:41 -06:00
parent d6eac3f377
commit e5f46105a1
2 changed files with 24 additions and 39 deletions
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51
m4/virt-readline.m4
View File

@ -18,48 +18,33 @@ dnl <http://www.gnu.org/licenses/>.
dnl
AC_DEFUN([LIBVIRT_CHECK_READLINE],[
READLINE_LIBS=
AC_CHECK_HEADERS([readline/readline.h])
AC_CHECK_LIB([readline], [readline],
[lv_use_readline=yes; READLINE_LIBS=-lreadline],
[lv_use_readline=no])
# If the above test failed, it may simply be that -lreadline requires
# some termcap-related code, e.g., from one of the following libraries.
# See if adding one of them to LIBS helps.
if test $lv_use_readline = no; then
lv_saved_libs=$LIBS
extra_LIBS=
lv_saved_libs=$LIBS
if test "x$with_readline" != xno; then
# Linking with -lreadline may require some termcap-related code, e.g.,
# from one of the following libraries. Add it to LIBS before using
# canned library checks; then verify later if it was needed.
LIBS=
AC_SEARCH_LIBS([tgetent], [ncurses curses termcap termlib])
case $LIBS in
no*) ;; # handle "no" and "none required"
*) # anything else is a -lLIBRARY
# Now, check for -lreadline again, also using $LIBS.
# Note: this time we use a different function, so that
# we don't get a cached "no" result.
AC_CHECK_LIB([readline], [rl_initialize],
[lv_use_readline=yes
READLINE_LIBS="-lreadline $LIBS"],,
[$LIBS])
;;
extra_LIBS=$LIBS ;;
esac
test $lv_use_readline = no &&
AC_MSG_WARN([readline library not found])
LIBS=$lv_saved_libs
LIBS="$lv_saved_libs $extra_LIBS"
fi
if test $lv_use_readline = yes; then
AC_DEFINE_UNQUOTED([USE_READLINE], 1,
[whether virsh can use readline])
READLINE_CFLAGS=-DUSE_READLINE
else
READLINE_CFLAGS=
fi
AC_SUBST([READLINE_CFLAGS])
# The normal library check...
LIBVIRT_CHECK_LIB([READLINE], [readline], [readline], [readline/readline.h])
# Touch things up to avoid $extra_LIBS, if possible. Test a second
# function, to ensure we aren't being confused by caching.
LIBS=$lv_saved_libs
AC_CHECK_LIB([readline], [rl_initialize],
[], [READLINE_LIBS="$READLINE_LIBS $extra_LIBS"])
LIBS=$lv_saved_libs
])
AC_DEFUN([LIBVIRT_RESULT_READLINE],[
LIBVIRT_RESULT([readline], [$lv_use_readline],
[CFLAGS='$READLINE_CFLAGS' LIBS='$READLINE_LIBS'])
LIBVIRT_RESULT_LIB([READLINE])
])

12
tools/virsh.c
View File

@ -48,7 +48,7 @@
#include <libxml/xpath.h>
#include <libxml/xmlsave.h>
#ifdef HAVE_READLINE_READLINE_H
#if WITH_READLINE
# include <readline/readline.h>
# include <readline/history.h>
#endif
@ -2580,7 +2580,7 @@ vshCloseLogFile(vshControl *ctl)
}
}
#ifdef USE_READLINE
#if WITH_READLINE
/* -----------------
* Readline stuff
@ -2765,7 +2765,7 @@ vshReadline(vshControl *ctl ATTRIBUTE_UNUSED, const char *prompt)
return readline(prompt);
}
#else /* !USE_READLINE */
#else /* !WITH_READLINE */
static int
vshReadlineInit(vshControl *ctl ATTRIBUTE_UNUSED)
@ -2799,7 +2799,7 @@ vshReadline(vshControl *ctl, const char *prompt)
return vshStrdup(ctl, r);
}
#endif /* !USE_READLINE */
#endif /* !WITH_READLINE */
static void
vshDeinitTimer(int timer ATTRIBUTE_UNUSED, void *opaque ATTRIBUTE_UNUSED)
@ -3026,7 +3026,7 @@ vshShowVersion(vshControl *ctl ATTRIBUTE_UNUSED)
#ifdef WITH_DTRACE_PROBES
vshPrint(ctl, " DTrace");
#endif
#ifdef USE_READLINE
#if WITH_READLINE
vshPrint(ctl, " Readline");
#endif
#ifdef WITH_DRIVER_MODULES
@ -3316,7 +3316,7 @@ main(int argc, char **argv)
if (ctl->cmdstr == NULL)
break; /* EOF */
if (*ctl->cmdstr) {
#if USE_READLINE
#if WITH_READLINE
add_history(ctl->cmdstr);
#endif
if (vshCommandStringParse(ctl, ctl->cmdstr))