AC_COND_WITH(PACKAGE [,DEFAULT])
, 

2005-01-25

Guido U. Draheim <guidod@gmx.de>

GPLWithACException
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation. As a special exception, the respective Autoconf Macro's copyright owner gives unlimited permission to copy, distribute and modify the configure scripts that are the output of Autoconf when processing the Macro. You need not follow the terms of the GNU General Public License when using or distributing such scripts

guidod's Obsoleted (obsoleted)

• obsoleted Use AX_SUBST_WITH or AM_CONDITIONAL.

Actually used after an AC_ARG_WITH(PKG,...) option-directive, where AC_ARG_WITH is a part of the standard autoconf to define a `configure` --with-PKG option.

The AC_COND_WITH(PKG) will use the $with_PKG var to define WITH_PKG and WITHOUT_PKG substitutions (AC_SUBST), that are either '' or '#'

• - depending whether the var was "no" or not (probably 'yes', or a

value); it will also declare WITHVAL_PKG for use when someone wanted to set a val other than just "yes". And there is a WITHDEF_PKG that expands to a C-precompiler definition of the form -DWITH_PKG or -DWITH_PKG=\"value\" (n.b.: the PKG *is* uppercased if in lowercase and "-" translit to "_").

This macro is most handily in making Makefile.in/Makefile.am that have a set of if-with declarations that can be defined as follows:

CFLAGS = -Wall @WITHOUT_FLOAT@ -msoft-float # --without-float
@WITH_FLOAT@ LIBS += -lm              # --with-float
DEFS += -DNDEBUG @WITHDEF_MY_PKG@     # --with-my-pkg="/usr/lib"
DEFS += @WITHVAL_DEFS@                # --with-defs="-DLOGLEVEL=6"

Example configure.in:

AC_ARG_WITH(float,
[ --with-float,       with float words support])
AC_COND_WITH(float,no)

Extened notes:

1. the idea comes from AM_CONDITIONAL but it is much easier to use, and unlike automake's ifcond, the Makefile.am will work as a normal $(MAKE) -f Makefile.am makefile.

2. the @VALS@ are parsed over by automake so automake will see all the filenames and definitions that follow @WITH_FLOAT@, so that the AC_COND_WITH user can see additional message if they apply.

3. in this m4-part, there's a AC_ARG_COND_WITH with the synopsis of AC_ARG_WITH and an implicit following AC_COND_WITH =:-)

4. and there is an AC_ARG_COND_WITH_DEFINE that will emit an implicit AC_DEFINE that is actually seen by autoheader, even generated with the correct name and comment, for config.h.in

some non-autoconf coders tend to create "editable" Makefile where they have out-commented lines with an example (additional) definition. Each of these can be replaced with a three-liner in configure.in as shown above. Starting to use AC_COND_WITH will soon lead you to provide a dozen --with-option rules for the `configure` user. Do it!

AC_DEFUN([AC_COND_WITH],
[dnl the names to be defined...
pushdef([WITH_VAR],    patsubst([with_$1], -, _))dnl
pushdef([VAR_WITH],    patsubst(translit([with_$1], [a-z], [A-Z]), -, _))dnl
pushdef([VAR_WITHOUT], patsubst(translit([without_$1], [a-z], [A-Z]), -, _))dnl
pushdef([VAR_WITHVAL], patsubst(translit([withval_$1], [a-z], [A-Z]), -, _))dnl
pushdef([VAR_WITHDEF], patsubst(translit([withdef_$1], [a-z], [A-Z]), -, _))dnl
AC_SUBST(VAR_WITH)
AC_SUBST(VAR_WITHOUT)
AC_SUBST(VAR_WITHVAL)
AC_SUBST(VAR_WITHDEF)
if test -z "$WITH_VAR" ; then WITH_VAR=`echo ifelse([$2], , no, [$2])` ; fi
if test "$WITH_VAR" != "no"; then
  VAR_WITH=    ; VAR_WITHOUT='#'
  case "$WITH_VAR" in
    [yes)]    VAR_WITHVAL=""
              VAR_WITHDEF="-D""VAR_WITH" ;;
    [*)]      VAR_WITHVAL=WITH_VAR
              VAR_WITHDEF="-D""VAR_WITH="'"'$WITH_VAR'"' ;;
  esac
else
  VAR_WITH='#' ;  VAR_WITHOUT=
  VAR_WITHVAL= ;  VAR_WITHDEF=
fi
popdef([VAR_WITH])dnl
popdef([VAR_WITHOUT])dnl
popdef([VAR_WITHVAL])dnl
popdef([VAR_WITHDEF])dnl
popdef([WITH_VAR])dnl
])

AC_DEFUN([AC_ARG_COND_WITH],
[dnl
AC_ARG_WITH([$1],[$2],[$3],[$4],[$5])
# done with AC_ARG_WITH, now do AC_COND_WITH (rather than AM_CONDITIONAL)
AC_COND_WITH([$1])
])

dnl and the same version as AC_COND_WITH but including the
dnl AC_DEFINE for WITH_PACKAGE

AC_DEFUN([AC_COND_WITH_DEFINE],
[dnl the names to be defined...
pushdef([WITH_VAR],    patsubst([with_$1], -, _))dnl
pushdef([VAR_WITH],    patsubst(translit([with_$1], [a-z], [A-Z]), -, _))dnl
pushdef([VAR_WITHOUT], patsubst(translit([without_$1], [a-z], [A-Z]), -, _))dnl
pushdef([VAR_WITHVAL], patsubst(translit([withval_$1], [a-z], [A-Z]), -, _))dnl
pushdef([VAR_WITHDEF], patsubst(translit([withdef_$1], [a-z], [A-Z]), -, _))dnl
AC_SUBST(VAR_WITH)
AC_SUBST(VAR_WITHOUT)
AC_SUBST(VAR_WITHVAL)
AC_SUBST(VAR_WITHDEF)
if test -z "$WITH_VAR" ; then WITH_VAR=`echo ifelse([$2], , no, [$2])` ; fi
if test "$WITH_VAR" != "no"; then
  VAR_WITH=    ; VAR_WITHOUT='#'
  case "$WITH_VAR" in
    [yes)]    VAR_WITHVAL=""
              VAR_WITHDEF="-D""VAR_WITH" ;;
    [*)]      VAR_WITHVAL=WITH_VAR
              VAR_WITHDEF="-D""VAR_WITH="'"'$WITH_VAR'"' ;;
  esac
else
  VAR_WITH='#' ;  VAR_WITHOUT=
  VAR_WITHVAL= ;  VAR_WITHDEF=
fi
if test "_$WITH_VAR" != "_no" ; then
      AC_DEFINE_UNQUOTED(VAR_WITH, "$WITH_VAR", "--with-$1")
fi dnl
popdef([VAR_WITH])dnl
popdef([VAR_WITHOUT])dnl
popdef([VAR_WITHVAL])dnl
popdef([VAR_WITHDEF])dnl
popdef([WITH_VAR])dnl
])