Search for rocprofiler_set_api_table(...) via RTLD_DEFAULT (#56)

* Search for rocprofiler_set_api_table(...) via RTLD_DEFAULT

- check if rocprofiler_set_api_table function has already been loaded via dlsym(RTLD_DEFAULT, ...)
- fix warning about conflicting ROCM_DEP_ROCMCORE and ROCPROFILER_REGISTER_DEP_ROCMCORE

* Bump version to 0.4.0

[ROCm/rocprofiler-register commit: e2db37ca8d]

projects/rocprofiler-register/VERSION

@@ -1 +1 @@
-0.3.0
+0.4.0

projects/rocprofiler-register/cmake/rocprofiler_register_options.cmake

@@ -54,7 +54,8 @@ if(ROCPROFILER_REGISTER_BUILD_CI AND NOT ROCPROFILER_REGISTER_ENABLE_CLANG_TIDY)
             FORCE)
 endif()
 
-if(NOT ROCM_DEP_ROCMCORE EQUAL ROCPROFILER_REGISTER_DEP_ROCMCORE)
+if((ROCM_DEP_ROCMCORE AND NOT ROCPROFILER_REGISTER_DEP_ROCMCORE)
+   OR (NOT ROCM_DEP_ROCMCORE AND ROCPROFILER_REGISTER_DEP_ROCMCORE))
     message(
         AUTHOR_WARNING
             "Conflicting option values: ROCM_DEP_ROCMCORE = ${ROCM_DEP_ROCMCORE} and ROCPROFILER_REGISTER_DEP_ROCMCORE = ${ROCPROFILER_REGISTER_DEP_ROCMCORE}"

projects/rocprofiler-register/source/lib/rocprofiler-register/rocprofiler_register.cpp

@@ -273,6 +273,18 @@ rocp_load_rocprofiler_lib(std::string _rocp_reg_lib)
 
     if(rocprofiler_set_api_table) rocprofiler_lib_config_fn = &rocprofiler_set_api_table;
 
+    // return if found via LD_PRELOAD
+    if(rocprofiler_lib_config_fn)
+        return std::make_tuple(rocprofiler_lib_handle, rocprofiler_lib_config_fn);
+
+    // look to see if entrypoint function is already a symbol
+    *(void**) (&rocprofiler_lib_config_fn) =
+        dlsym(RTLD_DEFAULT, rocprofiler_lib_register_entrypoint);
+
+    // return if found via RTLD_DEFAULT
+    if(rocprofiler_lib_config_fn)
+        return std::make_tuple(rocprofiler_lib_handle, rocprofiler_lib_config_fn);
+
     if(_rocp_reg_lib.empty()) _rocp_reg_lib = rocprofiler_lib_name;
 
     auto _rocp_reg_lib_path       = fs::path{ _rocp_reg_lib };