Fix #2674: Ensure OpenSSL linkage for final app on Linux

Due to dependency propagation rules in CMake, OpenSSL::SSL was not linked
to the final executable when building on Linux. This change ensures the
linkage is explicit so SSL symbols are resolved.

Author: halx99

3rdparty/CMakeLists.txt

@@ -205,18 +205,7 @@ if(AX_WITH_JPEG AND NOT WINRT AND NOT EMSCRIPTEN)
   ax_add_3rd(jpeg-turbo)
 endif()
 
-add_subdirectory(openssl)
-
-if(ANDROID OR LINUX)
-  target_link_libraries(OpenSSL::SSL INTERFACE OpenSSL::Crypto)
-  target_link_libraries(3rdparty INTERFACE OpenSSL::SSL)
-else()
-  target_link_libraries(3rdparty
-    INTERFACE OpenSSL::Crypto
-    INTERFACE OpenSSL::SSL)
-endif()
-
-target_compile_definitions(3rdparty INTERFACE OPENSSL_SUPPRESS_DEPRECATED=1)
+ax_add_3rd(openssl TARGETS OpenSSL::SSL)
 
 if(AX_WITH_WEBP)
   ax_add_3rd(webp)
@@ -260,10 +249,6 @@ endif()
 
 if(AX_WITH_CURL AND NOT EMSCRIPTEN)
   ax_add_3rd(curl)
-
-  if(ANDROID OR LINUX)
-    target_link_libraries(curl INTERFACE OpenSSL::SSL)
-  endif()
 endif()
 
 if(AX_ENABLE_AUDIO)

3rdparty/curl/CMakeLists.txt

@@ -29,3 +29,7 @@ else()
     IMPORTED_LOCATION "${curl_LIB_DIR}/lib${lib_name}.a"
   )
 endif()
+
+if(ANDROID OR LINUX)
+  target_link_libraries(curl INTERFACE OpenSSL::SSL)
+endif()

3rdparty/openssl/CMakeLists.txt

@@ -55,3 +55,7 @@ set_openssl_sub_target(${target_name})
 # -----sub target 2: crypto-----
 set(target_name OpenSSL::Crypto crypto)
 set_openssl_sub_target(${target_name})
+
+# Ensure OpenSSL::SSL automatically propagates its dependency on OpenSSL::Crypto
+target_link_libraries(OpenSSL::SSL INTERFACE OpenSSL::Crypto)
+target_compile_definitions(OpenSSL::SSL INTERFACE OPENSSL_SUPPRESS_DEPRECATED=1)

3rdparty/yasio/CMakeLists.txt

@@ -1,4 +1,3 @@
-
 set(lib_name yasio)
 set(target_name ${lib_name})
 
@@ -40,3 +39,7 @@ if(kcp_SOURCE_DIR)
   target_compile_definitions(${target_name} PUBLIC YASIO_ENABLE_KCP=1)
   target_include_directories(${target_name} PUBLIC ${kcp_SOURCE_DIR})
 endif()
+
+if(ANDROID OR LINUX)
+    target_link_libraries(yasio INTERFACE OpenSSL::SSL)
+endif()