CMake: Improve config installation

Use 'GNUInstallDirs' standard module to set destinations of installed
files.

Use uppercase "CURL" names instead of lowercase "curl" to match standard
'FindCURL.cmake' CMake module:
* https://cmake.org/cmake/help/latest/module/FindCURL.html

Meaning:
* Install 'CURLConfig.cmake' instead of 'curl-config.cmake'
* User should call 'find_package(CURL)' instead of 'find_package(curl)'

Use 'configure_package_config_file' function to generate
'CURLConfig.cmake' file. This will make 'curl-config.cmake.in' template
file smaller and handle components better.  E.g.  current configuration
report no error if user specified unknown components (note: new
configuration expects no components, report error if user will try to
specify any).

Closes https://github.com/curl/curl/pull/2849

1 files changed, 4 insertions, 10 deletions

diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
index be6f7a249..eca9a8af9 100644
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -109,19 +109,13 @@ target_include_directories(${LIB_NAME} INTERFACE
   $<BUILD_INTERFACE:${CURL_SOURCE_DIR}/include>)
 
 install(TARGETS ${LIB_NAME}
-  EXPORT libcurl-target
-  ARCHIVE DESTINATION lib
-  LIBRARY DESTINATION lib
-  RUNTIME DESTINATION bin
+  EXPORT ${TARGETS_EXPORT_NAME}
+  ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
+  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
 )
 
 export(TARGETS ${LIB_NAME}
        APPEND FILE ${PROJECT_BINARY_DIR}/libcurl-target.cmake
        NAMESPACE CURL::
 )
-
-install(EXPORT libcurl-target
-        FILE libcurl-target.cmake
-        NAMESPACE CURL::
-        DESTINATION ${CURL_INSTALL_CMAKE_DIR}
-)