I would like to suggest that values of IUSE_* variables (whose names end with values of USE_EXPAND variable), after prefixing with lower-cased names of appropriate variables included in USE_EXPAND, should be automatically added to IUSE variable.
Example: IUSE="abc" IUSE_LINGUAS="en fr +la pl ru" Effective IUSE would be "abc linguas_en linguas_fr +linguas_la linguas_pl linguas_ru". Currently ebuilds need to manually add such flags to IUSE. It's a zero-cost feature implemented in the attached patch, so including it in EAPI=3 (after temporary unlocking of list of features of EAPI=3) wouldn't delay implementing support for EAPI=3 in Portage. -- Arfrever Frehtes Taifersar Arahesis
Index: bin/ebuild.sh
===================================================================
--- bin/ebuild.sh (revision 13786)
+++ bin/ebuild.sh (working copy)
@@ -1154,6 +1154,22 @@ debug-print-section() {
debug-print "now in section $*"
}
+expand_IUSE() {
+ if ! has "${EAPI:-0}" 0 1 2 ; then
+ local var flag flag_prefix
+ for var in $USE_EXPAND ; do
+ for flag in $(eval echo \$IUSE_$var) ; do
+ flag_prefix=
+ if [[ ${flag:0:1} == [+-] ]] ; then
+ flag_prefix=${flag:0:1}
+ flag=${flag:1}
+ fi
+ IUSE="$IUSE $flag_prefix$(echo $var | LC_ALL=C tr [:upper:] [:lower:])_$flag"
+ done
+ done
+ fi
+}
+
# Sources all eclasses in parameters
declare -ix ECLASS_DEPTH=0
inherit() {
@@ -1240,6 +1256,8 @@ inherit() {
#turn off glob expansion
set -f
+ expand_IUSE
+
# If each var has a value, append it to the global variable E_* to
# be applied after everything is finished. New incremental behavior.
[ "${IUSE-unset}" != "unset" ] && export E_IUSE="${E_IUSE} ${IUSE}"
@@ -1750,6 +1768,10 @@ _source_ebuild() {
# eclasses, they need to be unset before this process of
# interaction begins.
unset DEPEND RDEPEND PDEPEND IUSE
+ local var
+ for var in $USE_EXPAND ; do
+ unset IUSE_$var
+ done
source "${EBUILD}" || die "error sourcing ebuild"
if [ "${EBUILD_PHASE}" != "depend" ] ; then
@@ -1773,6 +1795,8 @@ _source_ebuild() {
unset ECLASS E_IUSE E_DEPEND E_RDEPEND E_PDEPEND
+ expand_IUSE
+
# alphabetically ordered by $EBUILD_PHASE value
local f valid_phases
case "$EAPI" in
Index: bin/isolated-functions.sh
===================================================================
--- bin/isolated-functions.sh (revision 13786)
+++ bin/isolated-functions.sh (working copy)
@@ -512,8 +512,8 @@ save_ebuild_env() {
abort_test abort_install dyn_prepare dyn_configure \
dyn_compile dyn_test dyn_install \
dyn_preinst dyn_help debug-print debug-print-function \
- debug-print-section inherit EXPORT_FUNCTIONS newdepend newrdepend \
- newpdepend do_newdepend remove_path_entry \
+ debug-print-section expand_IUSE inherit EXPORT_FUNCTIONS \
+ newdepend newrdepend newpdepend do_newdepend remove_path_entry \
save_ebuild_env filter_readonly_variables preprocess_ebuild_env \
source_all_bashrcs ebuild_main \
ebuild_phase ebuild_phase_with_hooks \
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