Fix cxx/linker flags
Upstream PR: https://github.com/ROCm/rocm_smi_lib/pull/211
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -95,7 +95,7 @@ set(CMAKE_CXX_FLAGS
 
 # Clang does not set the build-id
 if (CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
-    set (CMAKE_SHARED_LINKER_FLAGS "-Wl,--build-id=sha1")
+    set (CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,--build-id=sha1")
 endif()
 
 # Use this instead of above for 32 bit
@@ -129,10 +129,16 @@ else ()
     set(CMAKE_CXX_FLAGS
       "${CMAKE_CXX_FLAGS} -DFORTIFY_SOURCE=2 -fstack-protector-all -Wcast-align")
     ## More security breach mitigation flags
-    set(CMAKE_CXX_FLAGS
-      "${CMAKE_CXX_FLAGS} -Wl,-z,noexecstack -Wl,-znoexecheap -Wl,-z,relro ")
-    set(CMAKE_CXX_FLAGS
-      "${CMAKE_CXX_FLAGS} -Wtrampolines -Wl,-z,now")
+    set(HARDENING_LDFLAGS
+      "${HARDENING_LDFLAGS} -Wl,-z,noexecstack -Wl,-z,relro -Wl,-z,now")
+    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${HARDENING_LDFLAGS}")
+    set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} ${HARDENING_LDFLAGS}")
+
+    include(CheckCXXCompilerFlag)
+    check_cxx_compiler_flag("-Wtrampolines" CXX_SUPPORTS_WTRAMPOLINES)
+    if (CXX_SUPPORTS_WTRAMPOLINES)
+        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wtrampolines")
+    endif ()
 endif ()
 
 set(COMMON_SRC_DIR "${PROJECT_SOURCE_DIR}/src")