CMake/Cygwin fix. autotools generated src/exv_conf.h being used by cmake (instead of his own).

- Added file detector and error message to CMakeLists.txt
- Added code to src/Makefile to delete src/exv_conf with $ make clean

CMakeLists.txt

@@ -8,9 +8,23 @@
 
 SET(CMAKE_LEGACY_CYGWIN_WIN32 0) # Remove when CMake >= 2.8.4 is required
 PROJECT( exiv2 )
-
 CMAKE_MINIMUM_REQUIRED( VERSION 2.6 )
 
+##
+# Running cmake in a tree in which we have run ./configure ; make 
+# creates src/exv_conf.h which conflicts with cmake's own exv_conf.h
+# This causes incorrect compilation and linking errors.
+#
+# Halt processing and ask the user to fix this.
+# Remedy $ cd src; make clean -or- $ rm -rf src/exv_conf.h
+macro(trouble M)
+    message(FATAL_ERROR ${M})
+endmacro(trouble) 
+if( EXISTS ${CMAKE_SOURCE_DIR}/src/exv_conf.h  )
+    trouble("${CMAKE_SOURCE_DIR}/src/exv_conf.h exists.  Please remove file and re-run cmake!")
+endif()
+##
+
 SET( PACKAGE_COPYRIGHT      "Andreas Huggel" )
 SET( PACKAGE_BUGREPORT      "ahuggel@gmx.net" )
 SET( PACKAGE                "exiv2" )
@@ -45,6 +59,7 @@ IF( MINGW OR UNIX )
                    )
 ENDIF( MINGW OR UNIX )
 
+
 if( MSVC )
 	include(CMake_msvc.txt)
 	msvc_runtime_report()

src/Makefile

@@ -315,6 +315,7 @@ mostlyclean:
 	$(RM) $(CCSRC:.cpp=.ii)
 	$(RM) lib
 	$(RM) path-test.o
+	$(RM) exv_conf.h
 	$(RM) $(CCSRC:%.cpp=.libs/%.d) $(CSRC:%.c=.libs/%.d)
 	@$(LIBTOOL) --mode=clean $(RM) $(LOBJ) $(sort $(BINOBJ) $(EXIV2OBJ) $(EXIV2COBJ) $(MCOBJ))
 
@@ -326,7 +327,7 @@ clean: mostlyclean
 # Run `make distclean' from the top source directory to also remove
 # files created by configuring the program.
 distclean: clean
-	$(RM) exv_conf.h doxygen.hpp
+	$(RM) doxygen.hpp
 ifdef DEP_TRACKING
 	$(RM) $(DEP)
 	-rmdir $(DEPDIR)
@@ -339,3 +340,6 @@ endif
 maintainer-clean: uninstall distclean
 	-$(RM) -r .deps
 	-$(RM) -r .libs
+
+# That's all Folks!
+##