Merge pull request #4423 from OSGeo/backport-4422-to-9.6

[Backport 9.6] Build: make sure that BUILD_SHARED_LIBS is initialized before defining DEFAULT_EMBED_RESOURCE_FILES

Author: kbevers

CMakeLists.txt

@@ -156,6 +156,13 @@ include(ProjConfig)
 include(ProjMac)
 include(policies)
 
+##############################################
+### SWITCH BETWEEN STATIC OR SHARED LIBRARY###
+##############################################
+
+# default config is shared
+option(BUILD_SHARED_LIBS "Build PROJ library shared." ON)
+
 ################################################################################
 # Check for nlohmann_json
 ################################################################################
@@ -368,6 +375,9 @@ function (is_sharp_embed_available res)
 endfunction()
 
 is_sharp_embed_available(IS_SHARP_EMBED_AVAILABLE_RES)
+if (NOT DEFINED BUILD_SHARED_LIBS)
+    message(FATAL_ERROR "BUILD_SHARED_LIBS should be set")
+endif()
 if (NOT BUILD_SHARED_LIBS)
     set(DEFAULT_EMBED_RESOURCE_FILES ON)
 else()

src/lib_proj.cmake

@@ -1,13 +1,5 @@
 message(STATUS "Configuring proj library:")
 
-##############################################
-### SWITCH BETWEEN STATIC OR SHARED LIBRARY###
-##############################################
-
-# default config is shared
-option(BUILD_SHARED_LIBS
-  "Build PROJ library shared." ON)
-
 find_package(Threads QUIET)
 if(Threads_FOUND AND CMAKE_USE_PTHREADS_INIT)
   add_definitions(-DPROJ_HAS_PTHREADS)