commit:     6029c8fcb03f40eba4da6e9d870b91de43670c67
Author:     Fabian Groffen <grobian <AT> gentoo <DOT> org>
AuthorDate: Tue May  4 17:20:52 2021 +0000
Commit:     Fabian Groffen <grobian <AT> gentoo <DOT> org>
CommitDate: Tue May  4 17:20:52 2021 +0000
URL:        https://gitweb.gentoo.org/repo/proj/prefix.git/commit/?id=6029c8fc

eclass/toolchain: sync with gx86

Signed-off-by: Fabian Groffen <grobian <AT> gentoo.org>

 eclass/toolchain.eclass | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/eclass/toolchain.eclass b/eclass/toolchain.eclass
index 6e7411559a..e85900934f 100644
--- a/eclass/toolchain.eclass
+++ b/eclass/toolchain.eclass
@@ -173,7 +173,16 @@ if [[ ${PN} != "kgcc64" && ${PN} != gcc-* ]] ; then
        tc_version_is_at_least 6.5 &&
                IUSE+=" graphite" TC_FEATURES+=(graphite)
        tc_version_is_between 4.9 8 && IUSE+=" cilk"
-       tc_version_is_at_least 4.9 && IUSE+=" ada +vtv"
+       tc_version_is_at_least 4.9 && IUSE+=" ada"
+
+       # Don't enable USE=vtv starting from gcc-10. Once gcc-10
+       # stable everywhere disable by default on older versions
+       # as well.
+       if tc_version_is_at_least 10; then
+               IUSE+=" vtv"
+       elif tc_version_is_at_least 4.9; then
+               IUSE+=" +vtv"
+       fi
        tc_version_is_at_least 5.0 && IUSE+=" jit"
        tc_version_is_between 5.0 9 && IUSE+=" mpx"
        tc_version_is_at_least 6.0 && IUSE+=" +pie +ssp +pch"

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