build: pass OpenSSL paths from CMake to Cargo

Derive OPENSSL_LIB_DIR from the library path found by CMake's
find_package(OpenSSL) and pass both OPENSSL_LIB_DIR and
OPENSSL_INCLUDE_DIR to cargo_build() via the ENV parameter.

This ensures openssl-sys finds the same OpenSSL installation that
CMake found, rather than searching independently. No functional
change — openssl-sys already dynamically links OpenSSL by default.

Author: wprzytula

cmake/Dependencies.cmake

@@ -103,6 +103,9 @@ if(CASS_USE_OPENSSL)
     message(STATUS "${OPENSSL_NAME} version: v${OPENSSL_VERSION}")
   endif()
 
+  # Derive OPENSSL_LIB_DIR for passing to openssl-sys via environment.
+  get_filename_component(OPENSSL_LIB_DIR "${OPENSSL_SSL_LIBRARY}" DIRECTORY)
+
   set(CASS_INCLUDES ${CASS_INCLUDES} ${OPENSSL_INCLUDE_DIR})
   set(CASS_LIBS ${CASS_LIBS} ${OPENSSL_LIBRARIES})
 endif()

scylla-rust-wrapper/CMakeLists.txt

@@ -57,7 +57,9 @@ else()
   set(CMAKE_Rust_FLAGS "${CMAKE_Rust_FLAGS_SONAME}")
 endif()
 if(CASS_BUILD_SHARED)
-  cargo_build(NAME scylla_cpp_driver CRATE_TYPE cdylib)
+  cargo_build(NAME scylla_cpp_driver CRATE_TYPE cdylib
+    ENV "OPENSSL_LIB_DIR=${OPENSSL_LIB_DIR}"
+        "OPENSSL_INCLUDE_DIR=${OPENSSL_INCLUDE_DIR}")
   create_copy($<TARGET_FILE:scylla_cpp_driver_cdylib> ${INSTALL_NAME_SHARED})
   add_library(scylla-cpp-driver SHARED IMPORTED GLOBAL)
   add_dependencies(scylla-cpp-driver ${INSTALL_NAME_SHARED}_copy)
@@ -75,7 +77,9 @@ if(CASS_BUILD_SHARED)
   endif()
 endif()
 if(CASS_BUILD_STATIC)
-  cargo_build(NAME scylla_cpp_driver CRATE_TYPE staticlib)
+  cargo_build(NAME scylla_cpp_driver CRATE_TYPE staticlib
+    ENV "OPENSSL_LIB_DIR=${OPENSSL_LIB_DIR}"
+        "OPENSSL_INCLUDE_DIR=${OPENSSL_INCLUDE_DIR}")
   create_copy($<TARGET_FILE:scylla_cpp_driver_staticlib> ${INSTALL_NAME_STATIC})
   add_library(scylla-cpp-driver_static STATIC IMPORTED GLOBAL)
   add_dependencies(scylla-cpp-driver_static ${INSTALL_NAME_STATIC}_copy)