toolchain.eclass: drop USE=sanitize support for <gcc-5

Sanitizer support appeared in gcc-4.8, but <gcc-5 does not
support modern glibc. Let's just drop support for it on
older gccs.

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>

diff --git a/eclass/toolchain.eclass b/eclass/toolchain.eclass
index 7135af0817d9c6bc960e2434f3cacc9c530b7a1e..ee466ee4d904fc110bc5a43ec407105e8c278dae 100644 (file)
--- a/eclass/toolchain.eclass
+++ b/eclass/toolchain.eclass
@@ -172,8 +172,9 @@ if [[ ${PN} != "kgcc64" && ${PN} != gcc-* ]] ; then
        tc_version_is_at_least 4.2 && IUSE+=" +openmp"
        tc_version_is_at_least 4.3 && IUSE+=" fixed-point"
        tc_version_is_at_least 4.7 && IUSE+=" go"
-       tc_version_is_at_least 4.8 &&
-               IUSE+=" +sanitize"
+       # sanitizer support appeared in gcc-4.8, but <gcc-5 does not
+       # support modern glibc.
+       tc_version_is_at_least 5 && IUSE+=" +sanitize"
        # Note:
        #   <gcc-4.8 supported graphite, it required forked ppl
        #     versions which we dropped.  Since graphite was also experimental in
@@ -1318,9 +1319,13 @@ toolchain_src_configure() {
                confgcc+=( --without-{cloog,ppl} )
        fi
 
-       if tc_version_is_at_least 4.8 && in_iuse sanitize ; then
-               # See Note [implicitly enabled flags]
-               confgcc+=( $(usex sanitize '' --disable-libsanitizer) )
+       if tc_version_is_at_least 4.8; then
+               if in_iuse sanitize ; then
+                       # See Note [implicitly enabled flags]
+                       confgcc+=( $(usex sanitize '' --disable-libsanitizer) )
+               else
+                       confgcc+=( --disable-libsanitizer )
+               fi
        fi
 
        if tc_version_is_at_least 6.0 && in_iuse pie ; then