C++ entry points (#7552)

Author: achamayou

cmake/ccf_app.cmake

@@ -30,18 +30,13 @@ function(add_ccf_app name)
   add_warning_checks(${name})
 
   target_link_libraries(
-    ${name} PRIVATE ${PARSED_ARGS_LINK_LIBS} ccf ccf_launcher
+    ${name} PRIVATE ${PARSED_ARGS_LINK_LIBS} ccf_launcher ccf
   )
 
   if(NOT (SAN OR TSAN))
     target_link_options(${name} PRIVATE LINKER:--no-undefined)
   endif()
 
-  target_link_options(
-    ${name} PRIVATE
-    LINKER:--undefined=enclave_create_node,--undefined=enclave_run
-  )
-
   set_property(TARGET ${name} PROPERTY POSITION_INDEPENDENT_CODE ON)
 
   add_san(${name})

src/enclave/entry_points.h

@@ -7,7 +7,7 @@
 
 #include <cstdint>
 
-extern "C"
+namespace ccf
 {
   CreateNodeStatus enclave_create_node(
     const EnclaveConfig& enclave_config,

src/enclave/main.cpp

@@ -22,7 +22,7 @@ namespace
 std::atomic<uint16_t> num_pending_threads = 0;
 std::atomic<uint16_t> num_complete_threads = 0;
 
-extern "C"
+namespace ccf
 {
   CreateNodeStatus enclave_create_node(
     const EnclaveConfig& enclave_config,