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Diffstat (limited to 'infrastructure/m4/vl_lib_readline.m4')
| -rw-r--r-- | infrastructure/m4/vl_lib_readline.m4 | 106 |
1 files changed, 106 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..7c9217d6 --- /dev/null +++ b/infrastructure/m4/vl_lib_readline.m4 @@ -0,0 +1,106 @@ +dnl @synopsis VL_LIB_READLINE +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 +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], + [Allow use of GNU readline (may violate GNU licence)]) + ) + vl_gnu_readline_lib="" + if test "x$enable_gnu_readline" = "xyes"; then + vl_gnu_readline_lib=readline + fi + AC_CACHE_CHECK([for a readline compatible library], + vl_cv_lib_readline, [ + ORIG_LIBS="$LIBS" + for readline_lib in edit editline $vl_gnu_readline_lib; do + for termcap_lib in "" termcap curses ncurses; do + if test -z "$termcap_lib"; then + TRY_LIB="-l$readline_lib" + else + TRY_LIB="-l$readline_lib -l$termcap_lib" + fi + LIBS="$ORIG_LIBS $TRY_LIB" + AC_TRY_LINK_FUNC(readline, vl_cv_lib_readline="$TRY_LIB") + if test -n "$vl_cv_lib_readline"; then + break + fi + done + if test -n "$vl_cv_lib_readline"; then + break + fi + done + if test -z "$vl_cv_lib_readline"; then + vl_cv_lib_readline="no" + LIBS="$ORIG_LIBS" + fi + ]) + + if test "x$vl_cv_lib_readline" != "xno"; then + AC_DEFINE(HAVE_LIBREADLINE, 1, + [Define if you have a readline compatible library]) + AC_CHECK_HEADERS(readline.h readline/readline.h) + AC_CACHE_CHECK([whether readline supports history], + vl_cv_lib_readline_history, [ + vl_cv_lib_readline_history="no" + AC_TRY_LINK_FUNC(add_history, vl_cv_lib_readline_history="yes") + ]) + if test "x$vl_cv_lib_readline_history" = "xyes"; then + AC_DEFINE(HAVE_READLINE_HISTORY, 1, + [Define if your readline library has \`add_history']) + AC_CHECK_HEADERS(history.h readline/history.h) + fi + fi +])dnl |