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+2017-08-17
+
+Puzzle with autotools/--with-adobe (solved:  seems to confined to my Mac Book Pro).
+-----------------------------------------------------------------------------------
+
+The --with-adobe code is new (added on Monday/Tuesday 2017-08-15).
+It's very much "Work in Progress" and will get lots more polishing.
+This builds and links on Mac and Linux (Cygwin isn't ready yet).
+Autotools isn't used with Visual Studio
+
+Default build (which compile/links xmpsdk/src) is fine (and passes test suite)
+$ sudo make distclean ; make config ; ./configure ; make ; sudo make install ; make samples ; make tests
+
+To build with the external Adobe SDK:
+
+$ sudo make distclean ; make config ; ./configure --with-adobe ; make
+
+Linux --with-adobe is working when I remove calls to DeleteNamespace in src/xmp.cpp.
+The test suite is mostly OK.  Some XMP output format has changed.
+There are some test crashes to be investigated.
+
+So, this issue only concerns linking on the Mac.
+
+The following command works:
+$ bin/exiv2 http://clanmills.com/Stonehenge.jpg is working
+
+The following command crashes when it attempts to execute XMPsdk code
+$ bin/exiv2 --verbose --version
+........
+config_path=/Users/rmills/.exiv2
+uid=501
+euid=501
+gid=20
+dyld: lazy symbol binding failed: Symbol not found: _WXMPMeta_Initialize_1
+  Referenced from: /Users/rmills/gnu/github/exiv2/src/.libs/libexiv2.26.dylib
+  Expected in: flat namespace
+
+dyld: Symbol not found: _WXMPMeta_Initialize_1
+  Referenced from: /Users/rmills/gnu/github/exiv2/src/.libs/libexiv2.26.dylib
+  Expected in: flat namespace
+
+Abort trap: 6
+$
+
+This is correct. libXMPCore.a is not in the mix.
+
+ls -alt src/.libs/libexiv2.26.dylib
+-rwxr-xr-x+ 1 rmills staff 2238124 Aug 17 11:07 src/.libs/libexiv2.26.dylib
+                           -------
+Edit src/Makefile#242 and change:
+	@$(LIBTOOL) --mode=link $(LINK.cc) -o ../bin/$@ $(LIBRARY) $(EXIV2OBJ) $(EXIV2COBJ) -rpath $(libdir)
+to:
+	@$(LIBTOOL) --mode=link $(LINK.cc) -lXMPCore -o ../bin/$@ $(LIBRARY) $(EXIV2OBJ) $(EXIV2COBJ) -rpath $(libdir)
+
+$ touch src/version.cpp src/exiv2.cpp ; make
+$ ls -alt src/.libs/libexiv2.26.dylib
+-rwxr-xr-x+ 1 rmills staff 4312308 Aug 17 11:17 src/.libs/libexiv2.26.dylib
+                           -------
+$ bin/exiv2
+dyld: Symbol not found: __ZNSiD0Ev
+  Referenced from: /Users/rmills/gnu/github/exiv2/src/.libs/libexiv2.26.dylib
+  Expected in: flat namespace
+ in /Users/rmills/gnu/github/exiv2/src/.libs/libexiv2.26.dylib
+Abort trap: 6
+605 rmills@rmillsmbp:~/gnu/github/exiv2 $
+
+$ c++filt _ZNSiD0Ev
+std::basic_istream<char, std::char_traits<char> >::~basic_istream()
+
+It appears that libexiv2.26.dylib isn't linked to the STL libraries.
+However I think problem may be with the "flat namespace" which tells the
+dynamic linker to search for library names.  The search order is:
+
+$ otool -L bin/.libs/exiv2
+bin/.libs/exiv2:
+	/usr/local/lib/libexiv2.26.dylib (compatibility version 26.0.0, current version 26.0.0)
+	/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1238.60.2)
+	/usr/local/lib/libintl.8.dylib (compatibility version 10.0.0, current version 10.2.0)
+	/usr/lib/libiconv.2.dylib (compatibility version 7.0.0, current version 7.0.0)
+	/usr/local/lib/libz.1.dylib (compatibility version 1.0.0, current version 1.2.11)
+	/usr/local/lib/libexpat.1.dylib (compatibility version 8.0.0, current version 8.0.0)
+	/usr/lib/libc++.1.dylib (compatibility version 1.0.0, current version 307.5.0)
+So, when he's loading libexiv2.26.dylib, he needs a symbol from libc++.1.dylib
+
+Amazingly, I got it to work on Wednesday morning.
+I must have been confused.  Something was working!
+
+Notes (mostly to remind of painful discoveries)
+-----------------------------------------------
+
+How does the build get generated?
+$ make config
+This generates ./configure by reading config/configure.ac
+
+When you use --with-adobe, CXXFLAGS and LDFLAGS are modified and ENABLE_XMP is set to 2016.
+Makefile has code to execute the script xmpsdk/buildXMPsdk.sh which
+downloads and builds the XMPsdk to create libCore.a (which we need) and libFiles.a
+
+config/config.mk.in is converted into config/config.mk and included in xmpsdk/src/Makefile
+This is really ugly.  config.mk also messes with CPPFLAGS and LDFLAGS
+
+To get -lXMPCore into the mix, set XMPSDK_LIBS in config/config.mk.in
+        XMPSDK_LIBS     = -lXMPCore
+
+508 rmills@rmillsmbp:~/gnu/github/exiv2 $ finder Makefile | xargs grep -H config.mk | grep include
+./contrib/organize/Makefile:include $(top_srcdir)/config/config.mk
+./doc/Makefile:include $(top_srcdir)/config/config.mk
+./samples/Makefile:include $(top_srcdir)/config/config.mk
+./src/Makefile:include $(top_srcdir)/config/config.mk
+./xmpsdk/src/Makefile:include $(top_srcdir)/config/config.mk
+509 rmills@rmillsmbp:~/gnu/github/exiv2 $
+
+
+Features to Add to the CMake code
+-----------------------------------------------------------------------------------
+ * Auto usage of ccache on Linux and Mac.
+ * Remove the trick to compile the documentation using the configure script. Native documentation generation on CMake.
+
+
+