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<title>Autoconf Macro: ac_cond_with</title>
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<td style="width:50%;" align="center">[<a href="index.html">Macro Index
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<td style="width:50%;" align="center">[<a href=
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"../m4source/ac_cond_with.m4">Download M4 Source</a>]</td>
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<p style="text-align:left; white-space:nowrap;"><code>AC_COND_WITH(PACKAGE
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[,DEFAULT])</code></p>
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<p>obsoleted - do not use this macro, use AX_SUBST_WITH or
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<p>actually used after an AC_ARG_WITH(PKG,...) option-directive, where
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AC_ARG_WITH is a part of the standard autoconf to define a `configure`
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--with-PKG option.</p>
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<p>the AC_COND_WITH(PKG) will use the $with_PKG var to define WITH_PKG and
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WITHOUT_PKG substitutions (AC_SUBST), that are either '' or '#' - depending
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whether the var was "no" or not (probably 'yes', or a value); it will also
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declare WITHVAL_PKG for use when someone wanted to set a val other than
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just "yes". And there is a WITHDEF_PKG that expands to a C-precompiler
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definition of the form -DWITH_PKG or -DWITH_PKG=\"value\" (n.b.: the PKG
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*is* uppercased if in lowercase and "-" translit to "_")</p>
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<p>this macro is most handily in making Makefile.in/Makefile.am that have a
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set of if-with declarations that can be defined as follows:</p>
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CFLAGS = -Wall @WITHOUT_FLOAT@ -msoft-float # --without-float
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@WITH_FLOAT@ LIBS += -lm # --with-float
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DEFS += -DNDEBUG @WITHDEF_MY_PKG@ # --with-my-pkg="/usr/lib"
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DEFS += @WITHVAL_DEFS@ # --with-defs="-DLOGLEVEL=6"
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<p>Example configure.in:</p>
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[ --with-float, with float words support])
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AC_COND_WITH(float,no)
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<p>1. the idea comes from AM_CONDITIONAL but it is much easier to use, and
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unlike automake's ifcond, the Makefile.am will work as a normal $(MAKE) -f
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Makefile.am makefile.</p>
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<p>2. the @VALS@ are parsed over by automake so automake will see all the
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filenames and definitions that follow @WITH_FLOAT@, so that the
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AC_COND_WITH user can see additional message if they apply.</p>
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<p>3. in this m4-part, there's a AC_ARG_COND_WITH with the synopsis of
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AC_ARG_WITH and an implicit following AC_COND_WITH =:-)</p>
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<p>4. and there is an AC_ARG_COND_WITH_DEFINE that will emit an implicit
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AC_DEFINE that is actually seen by autoheader, even generated with the
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correct name and comment, for config.h.in</p>
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<p>some non-autoconf coders tend to create "editable" Makefile where they
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have out-commented lines with an example (additional) definition. Each of
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these can be replaced with a three-liner in configure.in as shown above.
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Starting to use AC_COND_WITH will soon lead you to provide a dozen
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--with-option rules for the `configure` user. Do it!</p>
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<p>1.4 (last modified: 2003-05-21)</p>
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<p>Guido Draheim <guidod@gmx.de></p>
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<h2>M4 Source Code</h2>
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<pre class="m4source">
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AC_DEFUN([AC_COND_WITH],
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[dnl the names to be defined...
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pushdef([WITH_VAR], patsubst([with_$1], -, _))dnl
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pushdef([VAR_WITH], patsubst(translit([with_$1], [a-z], [A-Z]), -, _))dnl
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pushdef([VAR_WITHOUT], patsubst(translit([without_$1], [a-z], [A-Z]), -, _))dnl
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pushdef([VAR_WITHVAL], patsubst(translit([withval_$1], [a-z], [A-Z]), -, _))dnl
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pushdef([VAR_WITHDEF], patsubst(translit([withdef_$1], [a-z], [A-Z]), -, _))dnl
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AC_SUBST(VAR_WITHOUT)
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AC_SUBST(VAR_WITHVAL)
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AC_SUBST(VAR_WITHDEF)
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if test -z "$WITH_VAR" ; then WITH_VAR=`echo ifelse([$2], , no, [$2])` ; fi
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if test "$WITH_VAR" != "no"; then
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VAR_WITH= ; VAR_WITHOUT='#'
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[yes)] VAR_WITHVAL=""
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VAR_WITHDEF="-D""VAR_WITH" ;;
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[*)] VAR_WITHVAL=WITH_VAR
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VAR_WITHDEF="-D""VAR_WITH="'"'$WITH_VAR'"' ;;
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VAR_WITH='#' ; VAR_WITHOUT=
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VAR_WITHVAL= ; VAR_WITHDEF=
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popdef([VAR_WITH])dnl
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popdef([VAR_WITHOUT])dnl
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popdef([VAR_WITHVAL])dnl
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popdef([VAR_WITHDEF])dnl
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popdef([WITH_VAR])dnl
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AC_DEFUN([AC_ARG_COND_WITH],
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AC_ARG_WITH([$1],[$2],[$3],[$4],[$5])
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# done with AC_ARG_WITH, now do AC_COND_WITH (rather than AM_CONDITIONAL)
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dnl and the same version as AC_COND_WITH but including the
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dnl AC_DEFINE for WITH_PACKAGE
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AC_DEFUN([AC_COND_WITH_DEFINE],
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[dnl the names to be defined...
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pushdef([WITH_VAR], patsubst([with_$1], -, _))dnl
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pushdef([VAR_WITH], patsubst(translit([with_$1], [a-z], [A-Z]), -, _))dnl
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pushdef([VAR_WITHOUT], patsubst(translit([without_$1], [a-z], [A-Z]), -, _))dnl
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pushdef([VAR_WITHVAL], patsubst(translit([withval_$1], [a-z], [A-Z]), -, _))dnl
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pushdef([VAR_WITHDEF], patsubst(translit([withdef_$1], [a-z], [A-Z]), -, _))dnl
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AC_SUBST(VAR_WITHOUT)
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AC_SUBST(VAR_WITHVAL)
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AC_SUBST(VAR_WITHDEF)
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if test -z "$WITH_VAR" ; then WITH_VAR=`echo ifelse([$2], , no, [$2])` ; fi
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if test "$WITH_VAR" != "no"; then
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VAR_WITH= ; VAR_WITHOUT='#'
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[yes)] VAR_WITHVAL=""
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VAR_WITHDEF="-D""VAR_WITH" ;;
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[*)] VAR_WITHVAL=WITH_VAR
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VAR_WITHDEF="-D""VAR_WITH="'"'$WITH_VAR'"' ;;
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VAR_WITH='#' ; VAR_WITHOUT=
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VAR_WITHVAL= ; VAR_WITHDEF=
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if test "_$WITH_VAR" != "_no" ; then
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AC_DEFINE_UNQUOTED(VAR_WITH, "$WITH_VAR", "--with-$1")
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popdef([VAR_WITH])dnl
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popdef([VAR_WITHOUT])dnl
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popdef([VAR_WITHVAL])dnl
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popdef([VAR_WITHDEF])dnl
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popdef([WITH_VAR])dnl
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<a href="COPYING.html">GNU General Public License</a> with this special
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<a href="COPYING-Exception.html">exception</a>.
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