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AC_DEFINE_SUB_PATH(DEFNAME, varname, description)
Look at varname and detect the subpath that it contains relative to $prefix/$exec_prefix. If the path is indeed relative to $prefix/$exec_prefix, then a single "./" (dotslash) is prepended, otherwise it can be seen as an absolute path that can not be moved, which you possibly do for "/etc" files, or even those ending up in "/lib/modules" or "/winnt/system".
This macro is not very intelligent, it's just a first try in this direction. It does currently just look into the current patterns, and replaces a ${prefix} with a simple dot. Amazingly, it works quite well for most packages.
Example (configure.ac):
AC_DEFINE_DIR([EPREFIX], [exec_prefix], [--exec-prefix or default]) AC_DEFINE_SUB_PATH([PATH_LIBDIR], [libdir], [--bindir subdir]) AC_DEFINE_UNQUOTED([PACKAGE],"$PACKAGE", [Name of package])
Example (in C):
static const char _libdir[] = PATH_LIBDIR; /* configure default */ char* libdir; char* eprefix = getenv (PACKAGE "DIR"); if (! eprefix) eprefix = EPREFIX; /* default */ if (*_libdir != '.') libdir = strdup(_libdir); else { libdir = malloc(strlen(eprefix) + strlen(_libdir) + 2); strcpy(libdir, eprefix); strcat(libdir, PATH_DELIMITER_STRING); strcat(libdir, _libdir); } ... free (libdir);
The AC_DEFINE_SUB_PATHS(varnames) macro looks for the given various install-paths that largely depend on either ${prefix} or ${exec_prefix}. Just cut out the prefix and ac_define the value. The value is uppercased and PATH_ prepended ie. ac_define_sub_paths(bindir libdir pkgdatadir) will create the defines PATH_BINDIR PATH_LIBDIR PATH_PKGDATADIR - see posix' include/paths.h that creates _PATH_DEV and friends.
Guido Draheim <guidod@gmx.de>
2001-07-26
AC_DEFUN([AC_DEFINE_SUB_PATH], [dnl test "_$prefix" = _NONE && prefix="$ac_default_prefix" test "_$exec_prefix" = _NONE && exec_prefix='${prefix}' P=`echo ifelse( $2, , [$]$1, [$]$2) | sed -e 's:^\${[a-z_]*prefix}:.:'` ifelse ($3, , AC_DEFINE($1, $P, [sub path $2]), AC_DEFINE($1, $P, $3)) ]) AC_DEFUN([AC_DEFINE_SUB_PATHS], [dnl test "_$prefix" = _NONE && prefix="$ac_default_prefix" test "_$exec_prefix" = _NONE && exec_prefix='${prefix}' for i in $1 ; do P=`echo \$$i | sed -e 's:^\${[a-z_]*prefix}:.:'` V=`echo path_$i | sed -e 'y:abcdefghijklmnopqrstuvwxyz:ABCDEFGHIJKLMNOPQRSTUVWXYZ:'` AC_DEFINE($V, $P, [sub path $i]), ])