AC-Archive - Macro: ac_cond

obsoleted - do not use this macro, 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 ])

ac_cond_with