PS-9151: Fix opensslpp build with WITH_SSL=openssl11

https://perconadev.atlassian.net/browse/PS-9151

The opensslpp build fails with "Could NOT find OpenSSL" error in case
WITH_SSL=openssl11 is used.

To fix the issue:
- Remove find_package(OpenSSL REQUIRED) in opensslpp/CMakeLists.txt.
  All openssl related preparations are done inside ssl.cmake.
- Update ssl.cmake to always create OpenSSL::SSL and OpenSSL::Crypto
  imported libs. For all possible WITH_SSL values: system, openssl11,
  /path/to/openssl.

cmake/ssl.cmake

@@ -221,26 +221,6 @@ MACRO(FIND_ALTERNATIVE_SYSTEM_SSL)
   SET(OPENSSL_SSL_LIBRARY ${OPENSSL_LIBRARY})
   SET(OPENSSL_CRYPTO_LIBRARY ${CRYPTO_LIBRARY})
 
-  # Add support for bundled curl.
-  ADD_LIBRARY(OpenSSL::SSL UNKNOWN IMPORTED)
-  SET_TARGET_PROPERTIES(OpenSSL::SSL PROPERTIES
-    INTERFACE_INCLUDE_DIRECTORIES "${OPENSSL_INCLUDE_DIR}")
-  IF(EXISTS "${OPENSSL_SSL_LIBRARY}")
-    SET_TARGET_PROPERTIES(OpenSSL::SSL PROPERTIES
-      IMPORTED_LINK_INTERFACE_LANGUAGES "C"
-      IMPORTED_LOCATION "${OPENSSL_SSL_LIBRARY}")
-  ENDIF()
-
-  # Add support for bundled curl.
-  ADD_LIBRARY(OpenSSL::Crypto UNKNOWN IMPORTED)
-  SET_TARGET_PROPERTIES(OpenSSL::Crypto PROPERTIES
-    INTERFACE_INCLUDE_DIRECTORIES "${OPENSSL_INCLUDE_DIR}")
-  IF(EXISTS "${OPENSSL_CRYPTO_LIBRARY}")
-    SET_TARGET_PROPERTIES(OpenSSL::Crypto PROPERTIES
-      IMPORTED_LINK_INTERFACE_LANGUAGES "C"
-      IMPORTED_LOCATION "${OPENSSL_CRYPTO_LIBRARY}")
-  ENDIF()
-
 ENDMACRO(FIND_ALTERNATIVE_SYSTEM_SSL)
 
 # MYSQL_CHECK_SSL
@@ -449,6 +429,28 @@ MACRO (MYSQL_CHECK_SSL)
       SET(MY_OPENSSL_LIBRARY "${CMAKE_BINARY_DIR}/copied_openssl.lib")
     ENDIF()
 
+    # Create OpenSSL::SSL and OpenSSL::Crypto imported libs for all possible
+    # WITH_SSL values (system, openssl11, /path/to/openssl). This will fix
+    # building modules which rely on OpenSSL::SSL and OpenSSL::Crypto only with
+    # different openssl variants.
+    ADD_LIBRARY(OpenSSL::SSL UNKNOWN IMPORTED)
+    SET_TARGET_PROPERTIES(OpenSSL::SSL PROPERTIES
+      INTERFACE_INCLUDE_DIRECTORIES "${OPENSSL_INCLUDE_DIR}")
+    IF(EXISTS "${MY_OPENSSL_LIBRARY}")
+      SET_TARGET_PROPERTIES(OpenSSL::SSL PROPERTIES
+        IMPORTED_LINK_INTERFACE_LANGUAGES "C"
+        IMPORTED_LOCATION "${MY_OPENSSL_LIBRARY}")
+    ENDIF()
+
+    ADD_LIBRARY(OpenSSL::Crypto UNKNOWN IMPORTED)
+    SET_TARGET_PROPERTIES(OpenSSL::Crypto PROPERTIES
+      INTERFACE_INCLUDE_DIRECTORIES "${OPENSSL_INCLUDE_DIR}")
+    IF(EXISTS "${MY_CRYPTO_LIBRARY}")
+      SET_TARGET_PROPERTIES(OpenSSL::Crypto PROPERTIES
+        IMPORTED_LINK_INTERFACE_LANGUAGES "C"
+        IMPORTED_LOCATION "${MY_CRYPTO_LIBRARY}")
+    ENDIF()
+
     MESSAGE(STATUS "OPENSSL_INCLUDE_DIR = ${OPENSSL_INCLUDE_DIR}")
     MESSAGE(STATUS "OPENSSL_LIBRARY = ${OPENSSL_LIBRARY}")
     MESSAGE(STATUS "CRYPTO_LIBRARY = ${CRYPTO_LIBRARY}")

extra/opensslpp/CMakeLists.txt

@@ -113,8 +113,6 @@ set(
 )
 list_transform_prepend(SOURCE_LIST "${SRC_DIR_EX}/")
 
-find_package(OpenSSL REQUIRED)
-
 add_library(${PROJECT_NAME} STATIC ${SOURCE_LIST} ${PUBLIC_HEADER_LIST} ${PRIVATE_HEADER_LIST})
 add_library(${PROJECT_NAME}::${PROJECT_NAME} ALIAS ${PROJECT_NAME})