newlib/config/confsubdir.m4

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dnl Fix Autoconf-2.59 AC_CONFIG_SUBDIRS whitespace mangling,
dnl by overriding the broken internal Autoconf macro with a
dnl backport of the 2.60 fix.
dnl
dnl This file should be a no-op for Autoconf versions != 2.59.
dnl It can be removed once the complete tree has moved to a
dnl newer Autoconf version.
dnl m4_PACKAGE_VERSION is an undocumented Autoconf macro.
dnl We use it because this fix is intended for 2.59 only.
dnl A feature test for the broken AC_CONFIG_SUBDIRS instead
dnl would be better but is tricky.
dnl
dnl Use ifdef/ifelse over m4_ifdef/m4_ifelse to be clean for 2.13.
dnl Redefine AC_CONFIG_SUBDIRS so aclocal pulls in this file
dnl when needed.
ifdef([m4_PACKAGE_VERSION],
[ifelse(m4_PACKAGE_VERSION, [2.59], [
dnl Redefine AC_CONFIG_SUBDIRS so this file is picked up if needed.
AC_DEFUN([AC_CONFIG_SUBDIRS], defn([AC_CONFIG_SUBDIRS]))
dnl Override the broken macro.
# _AC_OUTPUT_SUBDIRS
# ------------------
# This is a subroutine of AC_OUTPUT, but it does not go into
# config.status, rather, it is called after running config.status.
m4_define([_AC_OUTPUT_SUBDIRS],
[
#
# CONFIG_SUBDIRS section, as fixed in confsubdir.m4.
#
if test "$no_recursion" != yes; then
# Remove --cache-file and --srcdir arguments so they do not pile up.
ac_sub_configure_args=
ac_prev=
eval "set x $ac_configure_args"
shift
for ac_arg
do
if test -n "$ac_prev"; then
ac_prev=
continue
fi
case $ac_arg in
-cache-file | --cache-file | --cache-fil | --cache-fi \
| --cache-f | --cache- | --cache | --cach | --cac | --ca | --c)
ac_prev=cache_file ;;
-cache-file=* | --cache-file=* | --cache-fil=* | --cache-fi=* \
| --cache-f=* | --cache-=* | --cache=* | --cach=* | --cac=* | --ca=* \
| --c=*)
;;
--config-cache | -C)
;;
-srcdir | --srcdir | --srcdi | --srcd | --src | --sr)
ac_prev=srcdir ;;
-srcdir=* | --srcdir=* | --srcdi=* | --srcd=* | --src=* | --sr=*)
;;
-prefix | --prefix | --prefi | --pref | --pre | --pr | --p)
ac_prev=prefix ;;
-prefix=* | --prefix=* | --prefi=* | --pref=* | --pre=* | --pr=* | --p=*)
;;
*)
case $ac_arg in
*\'*) ac_arg=`echo "$ac_arg" | sed "s/'/'\\\\\\\\''/g"` ;;
esac
ac_sub_configure_args="$ac_sub_configure_args '$ac_arg'" ;;
esac
done
# Always prepend --prefix to ensure using the same prefix
# in subdir configurations.
ac_arg="--prefix=$prefix"
case $ac_arg in
*\'*) ac_arg=`echo "$ac_arg" | sed "s/'/'\\\\\\\\''/g"` ;;
esac
ac_sub_configure_args="$ac_arg $ac_sub_configure_args"
ac_popdir=`pwd`
for ac_dir in : $subdirs; do test "x$ac_dir" = x: && continue
# Do not complain, so a configure script can configure whichever
# parts of a large source tree are present.
test -d "$srcdir/$ac_dir" || continue
AC_MSG_NOTICE([configuring in $ac_dir])
AS_MKDIR_P(["$ac_dir"])
_AC_SRCPATHS(["$ac_dir"])
cd "$ac_dir"
# Check for guested configure; otherwise get Cygnus style configure.
if test -f "$ac_srcdir/configure.gnu"; then
ac_sub_configure=$ac_srcdir/configure.gnu
elif test -f "$ac_srcdir/configure"; then
ac_sub_configure=$ac_srcdir/configure
elif test -f "$ac_srcdir/configure.in"; then
# This should be Cygnus configure.
ac_sub_configure=$ac_aux_dir/configure
else
AC_MSG_WARN([no configuration information is in $ac_dir])
ac_sub_configure=
fi
# The recursion is here.
if test -n "$ac_sub_configure"; then
# Make the cache file name correct relative to the subdirectory.
case $cache_file in
[[\\/]]* | ?:[[\\/]]* ) ac_sub_cache_file=$cache_file ;;
*) # Relative path.
ac_sub_cache_file=$ac_top_builddir$cache_file ;;
esac
AC_MSG_NOTICE([running $SHELL $ac_sub_configure $ac_sub_configure_args --cache-file=$ac_sub_cache_file --srcdir=$ac_srcdir])
# The eval makes quoting arguments work.
eval "\$SHELL \"\$ac_sub_configure\" $ac_sub_configure_args \
--cache-file=\"\$ac_sub_cache_file\" --srcdir=\"\$ac_srcdir\"" ||
AC_MSG_ERROR([$ac_sub_configure failed for $ac_dir])
fi
cd "$ac_popdir"
done
fi
])# _AC_OUTPUT_SUBDIRS
])])