Add CMake code to handle external XMP

Experiment: Try with testing package

CMakeLists.txt

@@ -32,6 +32,7 @@ set( GENERIC_LIB_SOVERSION  "26" )
 # options and their default values
 option( BUILD_SHARED_LIBS             "Build exiv2lib as a shared library"                    ON  )
 option( EXIV2_ENABLE_XMP              "Build with XMP metadata support"                       ON  )
+option( EXIV2_ENABLE_EXTERNAL_XMP     "Use external version of XMP"                           OFF )
 option( EXIV2_ENABLE_PNG              "Build with png support (requires libz)"                ON  )
 option( EXIV2_ENABLE_NLS              "Build native language support (requires gettext)"      ON  )
 option( EXIV2_ENABLE_PRINTUCS2        "Build with Printucs2"                                  ON  )
@@ -81,7 +82,7 @@ endif()
 
 include(config/findDependencies.cmake)
 include(config/compilerFlags.cmake)
-include( config/generateConfigFile.cmake )
+include(config/generateConfigFile.cmake )
 include_directories(${CMAKE_BINARY_DIR})  # Make the exv_conf.h file visible for the full project
 
 include( config/CMakeChecks.txt )
@@ -93,6 +94,7 @@ endif()
 if( EXIV2_ENABLE_XMP )
     add_subdirectory( xmpsdk )
 endif()
+
 add_subdirectory( src )
 
 if( EXIV2_BUILD_UNIT_TESTS )

conanfile.py

@@ -4,8 +4,12 @@ from conans.tools import os_info
 class Exiv2Conan(ConanFile):
     settings = 'os', 'compiler', 'build_type', 'arch'
     generators = 'cmake'
-    options = {'unitTests': [True, False]}
-    default_options = 'unitTests=True'
+    options = {'unitTests': [True, False],
+               'xmp': [True, False],
+              }
+    default_options = ('unitTests=True',
+                       'xmp=False',
+                      )
 
     def configure(self):
         if not os_info.is_macos:
@@ -20,6 +24,9 @@ class Exiv2Conan(ConanFile):
         if self.options.unitTests:
             self.requires('gtest/1.8.0@bincrafters/stable')
 
+        if self.options.xmp:
+            self.requires('XmpSdk/2016.7@piponazo/testing')
+
     def imports(self):
         self.copy('*.dll', dst='conanDlls', src='bin')
         self.copy('*.dylib', dst='bin', src='lib')

config/findDependencies.cmake

@@ -30,6 +30,10 @@ if (EXIV2_ENABLE_XMP)
     find_package(EXPAT REQUIRED)
 endif ()
 
+if (EXIV2_ENABLE_EXTERNAL_XMP)
+    find_package(XmpSdk REQUIRED)
+endif()
+
 if( EXIV2_ENABLE_NLS )
     find_package(Intl)
     if(Intl_FOUND)

config/generateConfigFile.cmake

@@ -13,7 +13,7 @@ set(EXV_HAVE_PRINTUCS2   ${EXIV2_ENABLE_PRINTUCS2})
 set(EXV_PACKAGE          ${PACKAGE})
 set(EXV_PACKAGE_VERSION  ${PACKAGE_VERSION})
 set(EXV_PACKAGE_STRING   ${PACKAGE_STRING})
-set(EXV_HAVE_XMP_TOOLKIT ${EXIV2_ENABLE_XMP})
+set(EXV_HAVE_XMP_TOOLKIT ${EXIV2_ENABLE_XMP} OR ${EXIV2_ENABLE_EXTERNAL_XMP})
 set(EXV_HAVE_ICONV       ${ICONV_FOUND})
 set(EXV_HAVE_LIBZ        ${ZLIB_FOUND})
 set(EXV_UNICODE_PATH     ${EXIV2_ENABLE_WIN_UNICODE})

src/CMakeLists.txt

@@ -204,9 +204,13 @@ if ( UNIX AND CMAKE_SYSTEM_NAME STREQUAL "FreeBSD" )
     set (FREEBSD 1)
 endif()
 
-if ( EXIV2_ENABLE_XMP )
+if (EXIV2_ENABLE_XMP)
     #target_include_directories(exiv2lib PRIVATE ${CMAKE_SOURCE_DIR}/xmpsdk/include)
     target_link_libraries(exiv2lib PUBLIC xmp)
+elseif(EXIV2_ENABLE_EXTERNAL_XMP)
+    target_link_libraries(exiv2lib PUBLIC ${XMPSDK_LIBRARY})
+    target_include_directories(exiv2lib PUBLIC ${XMPSDK_INCLUDE_DIR})
+    target_compile_definitions(exiv2lib PUBLIC EXV_ADOBE_XMPSDK=2016)
 endif()
 
 # TODO : We should not include include/exiv2 but only include !!!