commit:     05a9d68615c60c4d524a193a32a30c9cdf551516
Author:     Michał Górny <mgorny <AT> gentoo <DOT> org>
AuthorDate: Sat May 20 21:02:53 2017 +0000
Commit:     Andreas Hüttel <dilfridge <AT> gentoo <DOT> org>
CommitDate: Sun May 21 16:32:14 2017 +0000
URL:        https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=05a9d686

package.mask: Mask old GCC versions (< 4.9)

 profiles/package.mask | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/profiles/package.mask b/profiles/package.mask
index 2e5b76bc249..55efc5628ff 100644
--- a/profiles/package.mask
+++ b/profiles/package.mask
@@ -29,6 +29,17 @@
 
 #--- END OF EXAMPLES ---
 
+# Michał Górny <mgo...@gentoo.org>, Andreas K. Hüttel <dilfri...@gentoo.org>,
+# Matthias Maier <tam...@gentoo.org> (21 May 2017)
+# Those old versions of GCC are no longer really supported and are not
+# suitable for use as a system-wide compiler. Using them can result
+# in build failures (and possible breakage) for many packages.
+#
+# If you still use one of these as your system compiler, please upgrade
+# and switch the compiler ASAP. If you need them for a specific (isolated)
+# use case, feel free to unmask them on your system.
+<sys-devel/gcc-4.9
+
 # Michał Górny <mgo...@gentoo.org> (20 May 2017)
 # Old versions of CUDA and their reverse dependencies. They do not
 # support GCC 4.9+, and are really old.

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