[libvirt] [PATCH 4/6] m4: readline: Drop extra_LIBS machinery

[Andrea Bolognani]

The first implementation of this logic was introduced with
commit 2ec759fc58f all the way back in 2007; looking at the
build logs from our CI environment, however, it's apparent
that none of the platforms we currently target are actually
using it, so we can assume whatever issue it was working
around has been fixed at some point in the last 12 years.

Signed-off-by: Andrea Bolognani <abologna at redhat.com>
---
 m4/virt-readline.m4 | 23 -----------------------
 1 file changed, 23 deletions(-)

diff --git a/m4/virt-readline.m4 b/m4/virt-readline.m4
index 09d5d820ea..a2788cb4aa 100644
--- a/m4/virt-readline.m4
+++ b/m4/virt-readline.m4
@@ -22,33 +22,10 @@ AC_DEFUN([LIBVIRT_ARG_READLINE],[
 ])
 
 AC_DEFUN([LIBVIRT_CHECK_READLINE],[
-  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 $LIBS in
-      no*) ;;  # handle "no" and "none required"
-      *) # anything else is a -lLIBRARY
-	extra_LIBS=$LIBS ;;
-    esac
-    LIBS="$lv_saved_libs $extra_LIBS"
-  fi
 
   # 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
-
   # We need this to avoid compilation issues with modern compilers.
   # See 9ea3424a178 for a more detailed explanation
   if test "$with_readline" = "yes" ; then
-- 
2.20.1