apache-2.eclass: avoid multiple selected MPMs by REQUIRED_USE

Still allow that none was given so automatic selection depending on threads
useflag still works as before.

diff --git a/eclass/apache-2.eclass b/eclass/apache-2.eclass
index 8eae93fb1d6b2329e0687f1434d5189052fb6b9c..ee70b2f222f521f49997d267206a25bbdcbe9dc2 100644 (file)
--- a/eclass/apache-2.eclass
+++ b/eclass/apache-2.eclass
@@ -97,9 +97,24 @@ for module in ${IUSE_MODULES} ; do
        IUSE="${IUSE} apache2_modules_${module}"
 done
 
-for mpm in ${IUSE_MPMS} ; do
-       IUSE="${IUSE} apache2_mpms_${mpm}"
-done
+_apache2_set_mpms() {
+       local mpm
+       local ompm
+
+       for mpm in ${IUSE_MPMS} ; do
+               IUSE="${IUSE} apache2_mpms_${mpm}"
+
+               REQUIRED_USE="${REQUIRED_USE} apache2_mpms_${mpm}? ("
+               for ompm in ${IUSE_MPMS} ; do
+                       if [[ "${mpm}" != "${ompm}" ]] ; then
+                               REQUIRED_USE="${REQUIRED_USE} !apache2_mpms_${ompm}"
+                       fi
+               done
+               REQUIRED_USE="${REQUIRED_USE} )"
+       done
+}
+_apache2_set_mpms
+unset -f _apache2_set_mpms
 
 DEPEND="${CDEPEND}
        dev-lang/perl
@@ -152,16 +167,12 @@ setup_mpm() {
        MY_MPM=""
        for x in ${IUSE_MPMS} ; do
                if use apache2_mpms_${x} ; then
-                       if [[ -z "${MY_MPM}" ]] ; then
-                               MY_MPM=${x}
-                               elog
-                               elog "Selected MPM: ${MY_MPM}"
-                               elog
-                       else
-                               eerror "You have selected more then one mpm USE-flag."
-                               eerror "Only one MPM is supported."
-                               die "more then one mpm was specified"
-                       fi
+                       # there can at most be one MPM selected because of REQUIRED_USE constraints
+                       MY_MPM=${x}
+                       elog
+                       elog "Selected MPM: ${MY_MPM}"
+                       elog
+                       break
                fi
        done