SWDEV-323669 - Fix linux arch detection

CMake assumes we're bundling on x86, but for GNU compatible compilers,
we should rely on the compiler target to set the build arch.

For non-gnu compilers, just fall back to assuming x86 (no change).

Signed-off-by: Jeremy Newton <Jeremy.Newton@amd.com>
Change-Id: Iee9794e6f7c3973c781ddaf740ded77f34712c4f


[ROCm/clr commit: f2e5ef5617]

projects/clr/rocclr/cmake/ROCclr.cmake

@@ -100,7 +100,6 @@ if(NOT CMAKE_CL_64)
 endif()
 
 target_compile_definitions(rocclr PUBLIC
-  ATI_ARCH_X86
   LITTLEENDIAN_CPU
   WITH_LIQUID_FLASH=0
   ${AMD_OPENCL_DEFS})

projects/clr/rocclr/include/top.hpp

@@ -21,6 +21,16 @@
 #ifndef TOP_HPP_
 #define TOP_HPP_
 
+#if defined(__GNUC__)
+#if defined(__arm__) || defined(__aarch64__)
+#define ATI_ARCH_ARM
+#elif defined(__x86__) || defined(__x86_64__)
+#define ATI_ARCH_X86
+#endif
+#else /*!__GNUC__*/
+#define ATI_ARCH_X86
+#endif /*!__GNUC__*/
+
 #if defined(ATI_ARCH_ARM)
 #define __EXPORTED_HEADERS__ 1
 #endif /*ATI_ARCH_ARM*/