diff options
Diffstat (limited to 'infrastructure/m4/vl_lib_readline.m4')
-rw-r--r-- | infrastructure/m4/vl_lib_readline.m4 | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/infrastructure/m4/vl_lib_readline.m4 b/infrastructure/m4/vl_lib_readline.m4 new file mode 100644 index 00000000..a0571bfa --- /dev/null +++ b/infrastructure/m4/vl_lib_readline.m4 @@ -0,0 +1,135 @@ +dnl @synopsis VL_LIB_READLINE([ACTION-IF-TRUE], [ACTION-IF-FALSE]) +dnl +dnl Searches for a readline compatible library. If found, defines +dnl `HAVE_LIBREADLINE'. If the found library has the `add_history' +dnl function, sets also `HAVE_READLINE_HISTORY'. Also checks for the +dnl locations of the necessary include files and sets `HAVE_READLINE_H' +dnl or `HAVE_READLINE_READLINE_H' and `HAVE_READLINE_HISTORY_H' or +dnl 'HAVE_HISTORY_H' if the corresponding include files exists. +dnl +dnl The libraries that may be readline compatible are `libedit', +dnl `libeditline' and `libreadline'. Sometimes we need to link a +dnl termcap library for readline to work, this macro tests these cases +dnl too by trying to link with `libtermcap', `libcurses' or +dnl `libncurses' before giving up. +dnl +dnl Here is an example of how to use the information provided by this +dnl macro to perform the necessary includes or declarations in a C +dnl file: +dnl +dnl #ifdef HAVE_LIBREADLINE +dnl # if defined(HAVE_READLINE_READLINE_H) +dnl # include <readline/readline.h> +dnl # elif defined(HAVE_READLINE_H) +dnl # include <readline.h> +dnl # else /* !defined(HAVE_READLINE_H) */ +dnl extern char *readline (); +dnl # endif /* !defined(HAVE_READLINE_H) */ +dnl char *cmdline = NULL; +dnl #else /* !defined(HAVE_READLINE_READLINE_H) */ +dnl /* no readline */ +dnl #endif /* HAVE_LIBREADLINE */ +dnl +dnl #ifdef HAVE_READLINE_HISTORY +dnl # if defined(HAVE_READLINE_HISTORY_H) +dnl # include <readline/history.h> +dnl # elif defined(HAVE_HISTORY_H) +dnl # include <history.h> +dnl # else /* !defined(HAVE_HISTORY_H) */ +dnl extern void add_history (); +dnl extern int write_history (); +dnl extern int read_history (); +dnl # endif /* defined(HAVE_READLINE_HISTORY_H) */ +dnl /* no history */ +dnl #endif /* HAVE_READLINE_HISTORY */ +dnl +dnl Modifications to add --enable-gnu-readline to work around licensing +dnl problems between the traditional BSD licence and the GPL. +dnl Martin Ebourne, 2005/7/11 +dnl Rewrite to match headers with libraries and be more selective. +dnl Martin Ebourne, 2006/1/4 +dnl +dnl @category InstalledPackages +dnl @author Ville Laurikari <vl@iki.fi> +dnl @version 2002-04-04 +dnl @license AllPermissive + +AC_DEFUN([VL_LIB_READLINE], [ + AC_ARG_ENABLE( + [gnu-readline], + AC_HELP_STRING([--enable-gnu-readline], + [Use GNU readline if present (may violate GNU licence)]) + ) + vl_cv_lib_readline_compat_found=no + if test "x$enable_gnu_readline" = "xyes"; then + VL_LIB_READLINE_CHECK([readline], + [readline], + [readline/readline.h readline.h], + [readline/history.h history.h]) + fi + if test "x$vl_cv_lib_readline_compat_found" = "xno"; then + VL_LIB_READLINE_CHECK([editline], + [edit editline], + [editline/readline.h], + [editline/readline.h]) + fi + if test "x$vl_cv_lib_readline_compat_found" = "xyes"; then + m4_ifvaln([$1],[$1],[:])dnl + m4_ifvaln([$2],[else $2])dnl + fi +]) + +dnl VL_LIB_READLINE_CHECK(name, libraries, headers, history headers) +AC_DEFUN([VL_LIB_READLINE_CHECK], [ + AC_CACHE_CHECK([for $1 library], + [vl_cv_lib_$1], [ + ORIG_LIBS="$LIBS" + vl_cv_lib_$1="" + for readline_lib in $2; do + for termcap_lib in "" termcap curses ncurses; do + if test -z "$termcap_lib"; then + TRY_LIB="-l$readline_lib" + else + TRY_LIB="-l$readline_lib -l$termcap_lib" + fi + LIBS="$ORIG_LIBS $TRY_LIB" + AC_TRY_LINK_FUNC([readline], [vl_cv_lib_$1="$TRY_LIB"]) + if test -n "$vl_cv_lib_$1"; then + break + fi + done + if test -n "$vl_cv_lib_$1"; then + break + fi + done + if test -z "$vl_cv_lib_$1"; then + vl_cv_lib_$1=no + LIBS="$ORIG_LIBS" + fi + ]) + + vl_cv_lib_readline_compat_found=no + if test "x$vl_cv_lib_$1" != "xno"; then + AC_CHECK_HEADERS([$3], [vl_cv_lib_readline_compat_found=yes]) + fi + + if test "x$vl_cv_lib_readline_compat_found" = "xyes"; then + AC_DEFINE([HAVE_LIBREADLINE], 1, + [Define if you have a readline compatible library]) + + AC_CACHE_CHECK([whether $1 supports history], + [vl_cv_lib_$1_history], [ + vl_cv_lib_$1_history=no + AC_TRY_LINK_FUNC([add_history], [vl_cv_lib_$1_history=yes]) + ]) + if test "x$vl_cv_lib_$1_history" = "xyes"; then + vl_cv_lib_$1_history=no + AC_CHECK_HEADERS( + [$4], + [AC_DEFINE([HAVE_READLINE_HISTORY], [1], + [Define if your readline library has add_history])]) + fi + else + LIBS="$ORIG_LIBS" + fi +])dnl |