AC_DEFINE_SUB_PATH(DEFNAME, varname, description)
,
Guido U. Draheim <guidod@gmx.de>
GPLWithACException
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cryp.to ac-archive's Miscellaneous (released)
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
${exec_prefix}. Just cut out the prefix and ac_define the value.
The value is uppercased and PATH_ prepended ie.
ac_define_sub_paths(bindir libdir pkgdatadir) will create the
defines PATH_BINDIR PATH_LIBDIR PATH_PKGDATADIR - see posix'
include/paths.h that creates _PATH_DEV and friends.
AC_DEFUN([AC_DEFINE_SUB_PATH],
[dnl
test "_$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]),
])