checkasm: detect configuration for aarch64

configure.ac

@@ -51,6 +51,7 @@ case "${host_os}" in
         ARCH_X86_64=1
         ;;
     esac
+    AC_DEFINE(EXTERN_ASM, _, Mangling prefix)
     ;;
     *mingw32*)
     case "${host}" in
@@ -62,6 +63,7 @@ case "${host_os}" in
         ARCH_X86_64=1
         ;;
     esac
+    AC_DEFINE(EXTERN_ASM, , Mangling prefix)
     ;;
     *)
     case "${host}" in
@@ -73,6 +75,8 @@ case "${host_os}" in
         ARCH_X86_64=1
         ;;
     esac
+    AC_DEFINE(HAVE_SECTION_DATA_REL_RO, 1, Define to 1 if section data.rel.ro is supported)
+    AC_DEFINE(EXTERN_ASM, , Mangling prefix)
     ;;
 esac
 
@@ -222,7 +226,7 @@ AC_EGREP_HEADER(timespec,sys/time.h,[
         AC_MSG_RESULT(no)
 ])
 
-AC_MSG_CHECKING([for eventfd]) 
+AC_MSG_CHECKING([for eventfd])
 AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
         [[#include <sys/eventfd.h>]],
         [[eventfd (0, 0);]])
@@ -231,7 +235,18 @@ AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
         AC_DEFINE(HAVE_EVENTFD, 1, Define if the OS supports eventfd(2).)
 ],[
         AC_MSG_RESULT([no])
-]) 
+])
+
+AC_MSG_CHECKING([for as func])
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
+        [[]],
+        [[ asm(".func test\n\t.endfunc"); ]])
+],[
+        AC_MSG_RESULT([yes])
+        AC_DEFINE(HAVE_AS_FUNC, 1, Define if the assembly supports .func)
+],[
+        AC_MSG_RESULT([no])
+])
 
 AC_SUBST(SHREXT, "$shrext")
 

tests/checkasm/asm_aarch64.S

@@ -19,10 +19,8 @@
  */
 
 /* FIXME: Copied from a single instance of configuring FFmpeg on aarch64 */
+#include "config.h"
 #define CONFIG_PIC 1
-#define EXTERN_ASM
-#define HAVE_AS_FUNC 1
-#define HAVE_SECTION_DATA_REL_RO 1
 
 #ifdef __ELF__
 #   define ELF