Don't test for __attribute__ in the configure script.

Instead, use compiler test macros to check whether *particular*
attributes are supported, and set various #defines appropriately, in
header files.

Rename the UNALIGNED structure attribute to ND_UNALIGNED, and ask
whether we still need it.

1 files changed, 0 insertions, 144 deletions

diff --git a/configure b/configure
index 0c093913..aeeecb6c 100755
--- a/configure
+++ b/configure
@@ -3628,150 +3628,6 @@ cat >>confdefs.h <<_ACEOF
 _ACEOF
 
 
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for __attribute__" >&5
-$as_echo_n "checking for __attribute__... " >&6; }
-if ${ac_cv___attribute__+:} false; then :
-  $as_echo_n "(cached) " >&6
-else
-
-cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-
-
-#include <stdlib.h>
-
-static void foo(void) __attribute__ ((noreturn));
-
-static void
-foo(void)
-{
-  exit(1);
-}
-
-int
-main(int argc, char **argv)
-{
-  foo();
-}
-
-_ACEOF
-if ac_fn_c_try_compile "$LINENO"; then :
-  ac_cv___attribute__=yes
-else
-  ac_cv___attribute__=no
-fi
-rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
-fi
-
-if test "$ac_cv___attribute__" = "yes"; then
-
-$as_echo "#define HAVE___ATTRIBUTE__ 1" >>confdefs.h
-
-else
-  #
-  # We can't use __attribute__, so we can't use __attribute__((unused)),
-  # so we define _U_ to an empty string.
-  #
-  V_DEFS="$V_DEFS -D_U_=\"\""
-fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv___attribute__" >&5
-$as_echo "$ac_cv___attribute__" >&6; }
-
-if test "$ac_cv___attribute__" = "yes"; then
-
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether __attribute__((unused)) can be used without warnings" >&5
-$as_echo_n "checking whether __attribute__((unused)) can be used without warnings... " >&6; }
-if ${ac_cv___attribute___unused+:} false; then :
-  $as_echo_n "(cached) " >&6
-else
-
-save_CFLAGS="$CFLAGS"
-CFLAGS="$CFLAGS $ac_lbl_cc_force_warning_errors"
-cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-
-
-#include <stdlib.h>
-#include <stdio.h>
-
-int
-main(int argc  __attribute((unused)), char **argv __attribute((unused)))
-{
-  printf("Hello, world!\n");
-  return 0;
-}
-
-_ACEOF
-if ac_fn_c_try_compile "$LINENO"; then :
-  ac_cv___attribute___unused=yes
-else
-  ac_cv___attribute___unused=no
-fi
-rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
-fi
-
-CFLAGS="$save_CFLAGS"
-if test "$ac_cv___attribute___unused" = "yes"; then
-  V_DEFS="$V_DEFS -D_U_=\"__attribute__((unused))\""
-else
-  V_DEFS="$V_DEFS -D_U_=\"\""
-fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv___attribute___unused" >&5
-$as_echo "$ac_cv___attribute___unused" >&6; }
-
-
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether __attribute__((fallthrough)) can be used without warnings" >&5
-$as_echo_n "checking whether __attribute__((fallthrough)) can be used without warnings... " >&6; }
-if ${ac_cv___attribute___fallthrough+:} false; then :
-  $as_echo_n "(cached) " >&6
-else
-
-save_CFLAGS="$CFLAGS"
-CFLAGS="$CFLAGS $ac_lbl_cc_force_warning_errors"
-cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-
-
-#include <stdio.h>
-
-int
-main(int argc, char **argv)
-{
-	int x = 1;
-	switch (x)
-	{
-	case 1:
-		printf ("x == %d\n", x);
-		__attribute__ ((fallthrough));
-	case 2:
-		printf ("x == %d\n", x);
-		break;
-	default:
-		return 0;
-	}
-	return x;
-}
-
-_ACEOF
-if ac_fn_c_try_compile "$LINENO"; then :
-  ac_cv___attribute___fallthrough=yes
-else
-  ac_cv___attribute___fallthrough=no
-fi
-rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
-fi
-
-CFLAGS="$save_CFLAGS"
-if test "$ac_cv___attribute___fallthrough" = "yes"; then
-
-$as_echo "#define __ATTRIBUTE___FALLTHROUGH_OK 1" >>confdefs.h
-
-fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv___attribute___fallthrough" >&5
-$as_echo "$ac_cv___attribute___fallthrough" >&6; }
-
-fi
-
 ac_ext=c
 ac_cpp='$CPP $CPPFLAGS'
 ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'