Do not use gold linker for Qt5 ports.

  gold linker from binutils 2.28 may produce duplicate library
  symbols, which makes shared libraries created with it not usable
  with conventional ld linker.

PR:		218187
Submitted by:	amdmi3

1 files changed, 21 insertions, 0 deletions

diff --git a/UPDATING b/UPDATING
index 54b290c4446d..2e9cd36964b0 100644
--- a/UPDATING
+++ b/UPDATING
@@ -5,6 +5,27 @@ they are unavoidable.
 You should get into the habit of checking this file for changes each time
 you update your ports collection, before attempting any port upgrades.
 
+20170602:
+  AFFECTS: users of Qt 5 in presence of binutils
+  AUTHOR: amdmi3@FreeBSD.org
+
+  gold linker from binutils 2.28 may produce duplicate library
+  symbols, which makes shared libraries created with it not usable
+  with conventional ld linker.
+
+  This affects Qt, as qt5-qmake will detect gold and use it to build
+  Qt libraries. Broken libQt5Core will be produced and ports which
+  depend on it will then fail to link with the following errors:
+
+    ...lib/libQt5Core.so:(.dynamic+0x27ac8): multiple definition of `__bss_start at Qt_5'
+    ...lib/libQt5Core.so:(.dynamic+0x27ac8): first defined here
+    ...lib/libQt5Core.so:(.dynamic+0x27ac8): multiple definition of `_edata at Qt_5'
+    ...lib/libQt5Core.so:(.dynamic+0x27ac8): first defined here
+    ...lib/libQt5Core.so:(.dynamic+0x2b2d0): multiple definition of `_end at Qt_5'
+
+  Qt5 was fixed to ignore gold. If you see these errors, you
+  need to rebuild qt5-qmake, then all qt5-* ports.
+
 20170529:
   AFFECTS: users of sysutils/dsbmd
   AUTHOR: mk@freeshell.de