cmake: link curl to the OpenSSL targets instead of lib absolute paths

Reviewed-by: Jakub Zakrzewski
Reviewed-by: Sergei Nikulov
Closes curl#2753

CMake/curl-config.cmake → CMake/curl-config.cmake.in

@@ -9,6 +9,11 @@ if(NOT CURL_FIND_COMPONENTS)
   endif()
 endif()
 
+include(CMakeFindDependencyMacro)
+if(CURL_FIND_REQUIRED_libcurl)
+    find_dependency(OpenSSL "@OPENSSL_VERSION_MAJOR@")
+endif()
+
 set(_curl_missing_components)
 foreach(_comp ${CURL_FIND_COMPONENTS})
   if(EXISTS "${_DIR}/${_comp}-target.cmake")

CMakeLists.txt

@@ -352,8 +352,8 @@ if(CMAKE_USE_OPENSSL)
   set(USE_OPENSSL ON)
   set(HAVE_LIBCRYPTO ON)
   set(HAVE_LIBSSL ON)
-  list(APPEND CURL_LIBS ${OPENSSL_LIBRARIES})
-  include_directories(${OPENSSL_INCLUDE_DIR})
+  list(APPEND CURL_LIBS OpenSSL::SSL OpenSSL::Crypto)
+
   set(CMAKE_REQUIRED_INCLUDES ${OPENSSL_INCLUDE_DIR})
   check_include_file("openssl/crypto.h" HAVE_OPENSSL_CRYPTO_H)
   check_include_file("openssl/err.h"    HAVE_OPENSSL_ERR_H)
@@ -1308,9 +1308,9 @@ write_basic_package_version_file(
     COMPATIBILITY SameMajorVersion
 )
 
-configure_file(CMake/curl-config.cmake
+configure_file(CMake/curl-config.cmake.in
         "${PROJECT_BINARY_DIR}/curl-config.cmake"
-        COPYONLY
+        @ONLY
 )
 
 install(

Makefile.am

@@ -31,7 +31,7 @@ CMAKE_DIST = CMakeLists.txt CMake/CMakeConfigurableFile.in      \
  CMake/CurlSymbolHiding.cmake CMake/FindCARES.cmake             \
  CMake/FindLibSSH2.cmake CMake/FindNGHTTP2.cmake                \
  CMake/FindMbedTLS.cmake CMake/cmake_uninstall.cmake.in         \
- CMake/curl-config.cmake
+ CMake/curl-config.cmake.in
 
 VC6_LIBTMPL = projects/Windows/VC6/lib/libcurl.tmpl
 VC6_LIBDSP = projects/Windows/VC6/lib/libcurl.dsp.dist