AX_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 cannot 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 ${prefix} with a simple dot. Amazingly, it works quite well for most packages.
Example (configure.ac):
AX_DEFINE_DIR([EPREFIX], [exec_prefix], [--exec-prefix or default]) AX_DEFINE_SUB_PATH([PATH_LIBDIR], [libdir], [--bindir subdir]) AC_DEFINE_UNQUOTED([PACKAGE],"$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 AX_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. ax_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.
Download the latest version of ax_define_sub_path.m4 or browse the macro’s revision history.
Copyright © 2008 Guido U. Draheim guidod@gmx.de
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