Check for unaligned memory access support at compile time.

Don't test at configure time; that doesn't work when cross-compiling and
may be a pain to do with CMake.

1 files changed, 0 insertions, 95 deletions

diff --git a/configure b/configure
index e359c868..4203e731 100755
--- a/configure
+++ b/configure
@@ -7332,101 +7332,6 @@ $as_echo "$as_me: WARNING: can't find $name" >&2;}
 	    fi
     fi
 
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking if unaligned accesses fail" >&5
-$as_echo_n "checking if unaligned accesses fail... " >&6; }
-    if ${ac_cv_lbl_unaligned_fail+:} false; then :
-  $as_echo_n "(cached) " >&6
-else
-  case "$host_cpu" in
-
-	#
-	# These are CPU types where:
-	#
-	#	the CPU faults on an unaligned access, but at least some
-	#	OSes that support that CPU catch the fault and simulate
-	#	the unaligned access (e.g., Alpha/{Digital,Tru64} UNIX) -
-	#	the simulation is slow, so we don't want to use it;
-	#
-	#	the CPU, I infer (from the old
-	#
-	# XXX: should also check that they don't do weird things (like on arm)
-	#
-	#	comment) doesn't fault on unaligned accesses, but doesn't
-	#	do a normal unaligned fetch, either (e.g., presumably, ARM);
-	#
-	#	for whatever reason, the test program doesn't work
-	#	(this has been claimed to be the case for several of those
-	#	CPUs - I don't know what the problem is; the problem
-	#	was reported as "the test program dumps core" for SuperH,
-	#	but that's what the test program is *supposed* to do -
-	#	it dumps core before it writes anything, so the test
-	#	for an empty output file should find an empty output
-	#	file and conclude that unaligned accesses don't work).
-	#
-	# This run-time test won't work if you're cross-compiling, so
-	# in order to support cross-compiling for a particular CPU,
-	# we have to wire in the list of CPU types anyway, as far as
-	# I know, so perhaps we should just have a set of CPUs on
-	# which we know it doesn't work, a set of CPUs on which we
-	# know it does work, and have the script just fail on other
-	# cpu types and update it when such a failure occurs.
-	#
-	alpha*|arm*|bfin*|hp*|mips*|sh*|sparc*|ia64|nv1)
-		ac_cv_lbl_unaligned_fail=yes
-		;;
-
-	*)
-		cat >conftest.c <<EOF
-#		include <sys/types.h>
-#		include <sys/wait.h>
-#		include <stdio.h>
-		unsigned char a[5] = { 1, 2, 3, 4, 5 };
-		main() {
-		unsigned int i;
-		pid_t pid;
-		int status;
-		/* avoid "core dumped" message */
-		pid = fork();
-		if (pid <  0)
-			exit(2);
-		if (pid > 0) {
-			/* parent */
-			pid = waitpid(pid, &status, 0);
-			if (pid < 0)
-				exit(3);
-			exit(!WIFEXITED(status));
-		}
-		/* child */
-		i = *(unsigned int *)&a[1];
-		printf("%d\n", i);
-		exit(0);
-		}
-EOF
-		${CC-cc} -o conftest $CFLAGS $CPPFLAGS $LDFLAGS \
-		    conftest.c $LIBS >/dev/null 2>&1
-		if test ! -x conftest ; then
-						ac_cv_lbl_unaligned_fail=yes
-		else
-			./conftest >conftest.out
-			if test ! -s conftest.out ; then
-				ac_cv_lbl_unaligned_fail=yes
-			else
-				ac_cv_lbl_unaligned_fail=no
-			fi
-		fi
-		rm -f -r conftest* core core.conftest
-		;;
-	esac
-fi
-
-    { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lbl_unaligned_fail" >&5
-$as_echo "$ac_cv_lbl_unaligned_fail" >&6; }
-    if test $ac_cv_lbl_unaligned_fail = yes ; then
-
-$as_echo "#define LBL_ALIGN 1" >>confdefs.h
-
-    fi
-
 # Check for OpenSSL/libressl libcrypto
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to use OpenSSL/libressl libcrypto" >&5
 $as_echo_n "checking whether to use OpenSSL/libressl libcrypto... " >&6; }