Merge pull request #5668 from martin-frbg/issue5665

Fix CMake DYNAMIC_ARCH compilation with old compilers on ARM64

Author: martin-frbg

cmake/system_check.cmake

@@ -145,6 +145,15 @@ endif()
 endif()
 
 if (ARM64)
+if (NOT NO_SVE)
+  file(WRITE ${PROJECT_BINARY_DIR}/sve.c "#include <arm_sve.h>\n\n int main(void){}\n")
+  execute_process(COMMAND ${CMAKE_C_COMPILER} -march=armv8-a+sve -c -o ${PROJECT_BINARY_DIR}/sve.o ${PROJECT_BINARY_DIR}/sve.c OUTPUT_QUIET ERROR_QUIET RESULT_VARIABLE NO_SVE)
+if (NO_SVE EQUAL 1)
+set (CCOMMON_OPT "${CCOMMON_OPT} -DNO_SVE")
+endif()
+  file(REMOVE "${PROJECT_BINARY_DIR}/sve.c" "${PROJECT_BINARY_DIR}/sve.o")
+endif()
+
 if (NOT NO_SME)
   file(WRITE ${PROJECT_BINARY_DIR}/sme.c ".text \n.global sme_test\n\nsme_test:\nsmstart\nsmstop\nret\n")
   execute_process(COMMAND ${CMAKE_C_COMPILER} -march=armv9-a+sve2+sme -c -v -o ${PROJECT_BINARY_DIR}/sme.o ${PROJECT_BINARY_DIR}/sme.c OUTPUT_QUIET ERROR_QUIET RESULT_VARIABLE NO_SME)