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===================================================================
RCS file: /ftp/cvs/cvsroot/src/UPDATING,v
rcsdiff: /ftp/cvs/cvsroot/src/UPDATING,v: warning: Unknown phrases like `commitid ...;' are present.
retrieving revision 1.267
retrieving revision 1.276
diff -u -p -r1.267 -r1.276
--- src/UPDATING	2016/04/03 06:16:02	1.267
+++ src/UPDATING	2017/01/04 19:34:47	1.276
@@ -1,4 +1,4 @@
-$NetBSD: UPDATING,v 1.267 2016/04/03 06:16:02 mrg Exp $
+$NetBSD: UPDATING,v 1.276 2017/01/04 19:34:47 martin Exp $
 
 This file (UPDATING) is intended to be a brief reference to recent
 changes that might cause problems in the build process, and a guide for
@@ -19,8 +19,57 @@ See also: BUILDING, build.sh, Makefile.
 Recent changes:
 ^^^^^^^^^^^^^^^
 
+20170103:
+	a new version of flex has been imported.
+	Remove the file from obj (external/bsd/flex)
+	if you build.sh -u
+
+20161014:
+	a new version of OpenSSL has been imported.
+	Remove the files from obj (crypto/external/bsd/openssl) 
+	if you build.sh -u
+
+20161009:
+	a new version of dhcpcd has been imported with slightly changed
+	build infrastructure. When doing a build.sh -u this requires
+	pruning the external/bsd/dhcpcd objdir.
+
+20160914:
+	i386, amd64, shark, ofppc and macppc have joined shark and x68k
+	ports in using xorg-server 1.18. This requires a clean destdir
+	and a clean objdir.
+
+20160527:
+	i386 needs a full cleandir or objdir deletion because PIE has
+	been enabled. (see the amd64 entry two down for further info)
+
+20160418:
+	libedit needs manual removal of all autogenerated files since
+	some of them are not autogenerated anymore. Remember that there
+	might be two copies of libedit if your platform builds "compat".
+
+20160410:
+	amd64 needs full "make cleandir" or deletion of objdir now that
+	PIE has been enabled for amd64.  PIE, or position-independent
+	executables, means all code, including executables and not just
+	shared libraries, is position-independent and hence able to be
+	relocated by ASLR, address space layout randomization.
+
+	The change was made in Makefile variables for compiler and
+	linker flags, for which make(1) does not record dependencies,
+	hence it is unable to detect that all .o files need rebuilding.
+
+	Partial rebuilds with some modified source files will likely
+	fail when linking executables, since the linker refuses to mix
+	position-independent code with position-dependent code in
+	position-independent executables:
+
+		.../x86_64--netbsd/bin/ld: foo.o: relocation R_X86_64_32 against `...' cannot be used when making a shared object; recompile with -fPIC
+
 20160401:
 	Ports switching to GCC 5.3 will need a full "make cleandir".
+	Some people have found that cleandir is not sufficient, so if
+	in doubt delete the entire object directory tree for gcc.
 
 20160306:
 	NetBSD's regexp implementation is now part of libnbcompat.