CMake 3.15 doesn't know file(GENERATE TARGET)

Author: vector-of-bool

src/libmongoc/CMakeLists.txt

@@ -1287,20 +1287,20 @@ endfunction()
 
 # Generate pkg-config for mongoc_shared
 if(TARGET mongoc_shared)
+   set(GENERATE_TARGET mongoc_shared)
    _mongoc_configure_and_generate_file(
       src/libmongoc.pc.in
-      src/libmongoc-1.0.pc
-      TARGET mongoc_shared)
+      src/libmongoc-1.0.pc)
    install(FILES ${CMAKE_CURRENT_BINARY_DIR}/src/libmongoc-1.0.pc
            DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)
 endif()
 
 # Now one for mongoc_static:
 if(TARGET mongoc_static)
+   set(GENERATE_TARGET mongoc_static)
    _mongoc_configure_and_generate_file(
       src/libmongoc.pc.in
-      src/libmongoc-static-1.0.pc
-      TARGET mongoc_static)
+      src/libmongoc-static-1.0.pc)
    if(MONGOC_ENABLE_STATIC_INSTALL)
       install(FILES ${CMAKE_CURRENT_BINARY_DIR}/src/libmongoc-static-1.0.pc
               DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)

src/libmongoc/src/libmongoc.pc.in

@@ -3,16 +3,16 @@ exec_prefix=${prefix}
 libdir=@libdir@
 includedir=${exec_prefix}/include
 
-Name: $<TARGET_PROPERTY:pc_NAME>
-Description: $<TARGET_PROPERTY:pc_DESCRIPTION>
-Version: $<TARGET_PROPERTY:pc_VERSION>
+Name: $<TARGET_PROPERTY:@GENERATE_TARGET@,pc_NAME>
+Description: $<TARGET_PROPERTY:@GENERATE_TARGET@,pc_DESCRIPTION>
+Version: $<TARGET_PROPERTY:@GENERATE_TARGET@,pc_VERSION>
 
 %define $<is-empty: $<STREQUAL:@empty@,
 %define $<<not-empty: $<NOT:$<is-empty:
 
 #~ "Requires" dependencies:
 %define requires_joiner @newline@~ Requires: ~@space@
-%define requires_prop $<TARGET_PROPERTY:pc_REQUIRES>
+%define requires_prop $<TARGET_PROPERTY:@GENERATE_TARGET@,pc_REQUIRES>
 #~ Conditional: Only expand a first "\nRequires: " if Requires is non-empty:
 %define has_requires $<<not-empty:requires_prop>>
 ~$<has_requires:requires_joiner>
@@ -22,36 +22,36 @@ Version: $<TARGET_PROPERTY:pc_VERSION>
 ~@newline@~
 
 #~ Link options:
-Libs: -L${libdir} -l$<TARGET_PROPERTY:OUTPUT_NAME> ~@space@~
+Libs: -L${libdir} -l$<TARGET_PROPERTY:@GENERATE_TARGET@,OUTPUT_NAME> ~@space@~
     #~ Join each "Libs" item with spaces. This could be more robust, but it suites our purposes:
-    %define libs_prop $<TARGET_PROPERTY:pc_LIBS>
+    %define libs_prop $<TARGET_PROPERTY:@GENERATE_TARGET@,pc_LIBS>
     #~ Remove duplicate items, which will usually be redundant link paths:
     %define libs $<REMOVE_DUPLICATES:libs_prop>
     $<JOIN:libs,@space@>~
 
     #~ Add link options. Don't remove duplicates, because they may be important
-    %define link_opts $<TARGET_PROPERTY:INTERFACE_LINK_OPTIONS>
+    %define link_opts $<TARGET_PROPERTY:@GENERATE_TARGET@,INTERFACE_LINK_OPTIONS>
     $<$<<not-empty:link_opts>>:@space@$<JOIN:link_opts,@space@>>
 
 ~@newline@~
 
 #~ Compile-flags:
-%define cflags_prop $<TARGET_PROPERTY:pc_CFLAGS>
+%define cflags_prop $<TARGET_PROPERTY:@GENERATE_TARGET@,pc_CFLAGS>
 Cflags: $<JOIN:cflags_prop,@space@> ~@space@~
 
     #~ Options:
-    %define opts_prop $<TARGET_PROPERTY:INTERFACE_COMPILE_OPTIONS>
+    %define opts_prop $<TARGET_PROPERTY:@GENERATE_TARGET@,INTERFACE_COMPILE_OPTIONS>
     %define opts $<REMOVE_DUPLICATES:opts_prop>
     $<JOIN:opts,@space@>~
 
     #~ Preprocessor definitions:
-    %define defs_prop $<TARGET_PROPERTY:INTERFACE_COMPILE_DEFINITIONS>
+    %define defs_prop $<TARGET_PROPERTY:@GENERATE_TARGET@,INTERFACE_COMPILE_DEFINITIONS>
     %define defs $<REMOVE_DUPLICATES:defs_prop>
     $<$<<not-empty:defs>>: -D>~
               $<JOIN:defs, -D>~
 
     #~ Inclusions:
-    %define inc_prop $<TARGET_PROPERTY:pc_INCLUDE_DIRECTORIES>
+    %define inc_prop $<TARGET_PROPERTY:@GENERATE_TARGET@,pc_INCLUDE_DIRECTORIES>
     %define incs $<REMOVE_DUPLICATES:inc_prop>
     #~ Absolute path includes are kept absolute:
     %define abs_includes $<FILTER:incs,INCLUDE,^/>