groups.d/dev_packages.group: copy all group variables from native_packages.

subr.ex/ex_pkg.subr:ex_pkg_copy_group_vars(): initial implementation.
etc/README.md: updated.

3 files changed, 37 insertions, 13 deletions

diff --git a/etc/README.md b/etc/README.md
index 98f1d35b..38206285 100644
--- a/etc/README.md
+++ b/etc/README.md
@@ -342,7 +342,14 @@ build groups without taking ownership thereof, if ``owner`` is specified, the de
 group owns all of its packages. If ``noauto`` is specified, the build group will not be added to
 the list of build groups to build by default, if ``auto`` is specified, the build group will be
 added to the list of build groups to build by default.  
- 
+  
+If a build group that specifies ``copy`` should copy all of its build group variables from another
+build group, use the following code:
+
+```shell
+ex_pkg_copy_group_vars "<source group name>" "<destination group name>";
+```
+
 Additionally, single package files may be added beneath ``groups.d/[0-9][0-9][0-9].<group name>.d/``,
 named ``<package name>.package`` containing the package's variables, with the following epilogue,
 the parameters enclosed in square brackets being optional:
diff --git a/groups.d/dev_packages.group b/groups.d/dev_packages.group
index c596224f..ec853c6d 100644
--- a/groups.d/dev_packages.group
+++ b/groups.d/dev_packages.group
@@ -1,20 +1,11 @@
 #
 # Build group dev_packages
 #
-rtl_lconcat2 \$DEV_PACKAGES_CFLAGS_CONFIGURE \$DEFAULT_CFLAGS "--sysroot=${PREFIX_NATIVE}";
-rtl_lconcat2 \$DEV_PACKAGES_CXXFLAGS_CONFIGURE \$DEFAULT_CXXFLAGS "--sysroot=${PREFIX_NATIVE}";
-DEV_PACKAGES_CONFIG_CACHE_LOCAL="${CONFIG_CACHE_GNULIB}";
-DEV_PACKAGES_CONFIGURE_ARGS="-C --disable-nls --host=${DEFAULT_TARGET} --prefix= --program-prefix= --target=${DEFAULT_TARGET}";
-DEV_PACKAGES_GROUP_DEPENDS="host_deps host_deps_rpm cross_toolchain host_toolchain host_tools native_toolchain native_tools";
-DEV_PACKAGES_LDFLAGS_CONFIGURE="--sysroot=${PREFIX_NATIVE}";
-DEV_PACKAGES_MAKEFLAGS_INSTALL="PREFIX= prefix=";
 DEV_PACKAGES_PACKAGES="
 ncurses ncursesw libiconv coreutils bash libz git make sed grep findutils
 m4 flex bison diffutils patch patchutils gzip tar dos2unix nano vim";
-DEV_PACKAGES_PKG_CONFIG_LIBDIR="${PREFIX_NATIVE}/lib/pkgconfig";
-DEV_PACKAGES_PREFIX="${PREFIX_NATIVE}";
-DEV_PACKAGES_PYTHON="${PREFIX}/bin/python2";
 
+ex_pkg_copy_group_vars "native_packages" "dev_packages";
 ex_pkg_register_group "dev_packages" "${RTL_FILEOP_SOURCE_FNAME}" "copy" "noauto";
 
 # vim:filetype=sh textwidth=0
diff --git a/subr.ex/ex_pkg.subr b/subr.ex/ex_pkg.subr
index c90515fb..2e86c319 100644
--- a/subr.ex/ex_pkg.subr
+++ b/subr.ex/ex_pkg.subr
@@ -50,6 +50,32 @@ ex_pkg_check_depends() {
 };
 
 #
+# ex_pkg_copy_group_vars() - copy build group variables into build group
+# @_group_name_src:		single source build group name
+# @_group_name_dst:		single destination build group name
+# @[_build_vars_default]:	optional list of default build variables, defaults to ${DEFAULT_BUILD_VARS}
+#
+# Returns:			zero (0) on success, non-zero (>0) on failure.
+#
+ex_pkg_copy_group_vars() {
+	local	_epcgv_group_name_src="${1#\$}" _epcgv_group_name_dst="${2#\$}"	\
+		_epcgv_build_vars_default="${3:-${DEFAULT_BUILD_VARS}}"		\
+		_epcgv_group_name_dst_uc="" _epcgv_group_name_src_uc=""		\
+		_epcgv_vname="" _epcgv_vval="";
+	rtl_toupper2 \$_epcgv_group_name_dst \$_epcgv_group_name_dst_uc;
+	rtl_toupper2 \$_epcgv_group_name_src \$_epcgv_group_name_src_uc;
+
+	for _epcgv_vname in ${_epcgv_build_vars_default}; do
+		if rtl_get_var_unsafe \$_epcgv_vval "${_epcgv_group_name_src_uc}_${_epcgv_vname}"\
+		&& [ "${_epcgv_vval:+1}" = 1 ]; then
+			rtl_set_var_unsafe "${_epcgv_group_name_dst_uc}_${_epcgv_vname}" "${_epcgv_vval}";
+		fi;
+	done;
+
+	return 0;
+};
+
+#
 # ex_pkg_find_package() - find build group a single named package belongs to
 # @_rgroup_name:	out reference to variable of build group name
 # @_group_names:	build group names
@@ -181,7 +207,7 @@ ex_pkg_get_package_vars() {
 
 	eval ${_epgpv_rpkg_vnames}='${_epgpv_vnames}';
 	return 0;
-}
+};
 
 #
 # ex_pkg_load_vars() - load build variables
@@ -304,7 +330,7 @@ ex_pkg_register() {
 # ${EXP_PKG_REGISTER_GROUP_RGROUPS}:		inout reference to variable of build groups
 # ${EXP_PKG_REGISTER_GROUP_RGROUPS_NOAUTO}:	inout reference to variable of build groups only built when requested
 #
-# Returns:		zero (0) on success, non-zero (>0) on failure.
+# Returns:					zero (0) on success, non-zero (>0) on failure.
 #
 ex_pkg_register_group() {
 	local	_eprg_group_name="${1}" _eprg_fname="${2}"		\