cmake: add aliases so exported target names are available in tree

Reviewed-by: Brad King
Closes #5206

lib/CMakeLists.txt

@@ -92,6 +92,11 @@ add_library(
   ${HHEADERS} ${CSOURCES}
   )
 
+add_library(
+  ${PROJECT_NAME}::${LIB_NAME}
+  ALIAS ${LIB_NAME}
+  )
+
 if(MSVC AND NOT BUILD_SHARED_LIBS)
   set_target_properties(${LIB_NAME} PROPERTIES STATIC_LIBRARY_FLAGS ${CMAKE_EXE_LINKER_FLAGS})
 endif()
@@ -143,5 +148,5 @@ install(TARGETS ${LIB_NAME}
 
 export(TARGETS ${LIB_NAME}
        APPEND FILE ${PROJECT_BINARY_DIR}/libcurl-target.cmake
-       NAMESPACE CURL::
+       NAMESPACE ${PROJECT_NAME}::
 )

src/CMakeLists.txt

@@ -67,6 +67,11 @@ add_executable(
   ${CURL_FILES}
   )
 
+add_executable(
+  ${PROJECT_NAME}::${EXE_NAME}
+  ALIAS ${EXE_NAME}
+  )
+
 if(CURL_HAS_LTO)
   set_target_properties(${EXE_NAME} PROPERTIES
     INTERPROCEDURAL_OPTIMIZATION_RELEASE TRUE
@@ -99,5 +104,5 @@ target_link_libraries(${EXE_NAME} libcurl ${CURL_LIBS})
 install(TARGETS ${EXE_NAME} EXPORT ${TARGETS_EXPORT_NAME} DESTINATION ${CMAKE_INSTALL_BINDIR})
 export(TARGETS ${EXE_NAME}
        APPEND FILE ${PROJECT_BINARY_DIR}/curl-target.cmake
-       NAMESPACE CURL::
+       NAMESPACE ${PROJECT_NAME}::
 )