Move compile-mbr.sh script into fail-mbr's automake

configure.ac

@@ -87,7 +87,6 @@ AC_MSG_RESULT([$fuse_version])
 fi
 
 AC_CHECK_LIB([pthread], [pthread_create], [], AC_MSG_ERROR([*** pthread library (libpthread) not found]))
-AC_PATH_PROG(OBJCOPY, objcopy, ,)
 
 ##ext2/3##
 AC_ARG_ENABLE([extfs],
@@ -491,6 +490,14 @@ PKG_CHECK_VAR([bashcompletiondir], [bash-completion], [completionsdir], [],
     [bashcompletiondir="${sysconfdir}/bash_completion.d"])
 AC_SUBST(bashcompletiondir)
 
+##fail-mbr
+AC_CHECK_TOOL([OBJCOPY], [objcopy])
+AC_CHECK_TOOL([OBJDUMP], [objdump])
+AM_CONDITIONAL(X86, [case $host_cpu in
+    x86_64|i[0-9]86) true ;;
+    *) false ;;
+esac])
+
 AC_CONFIG_HEADERS([config.h])
 AC_CONFIG_FILES([
 	Makefile

fail-mbr/Makefile.am

@@ -6,5 +6,34 @@ clean-local:
 
 distclean-local: clean-local
 
-fail-mbr.bin:
-	sh $(srcdir)/compile-mbr.sh
+if X86
+fail-mbr.image: fail-mbr.S
+	$(CC) -c "$<" -o "$@"
+
+fail-mbr.bin: fail-mbr.image
+	$(OBJCOPY) -O binary --strip-unneeded -R .note -R .comment -R .note.gnu.build-id -R .note.gnu.property -R .reginfo -R .rel.dyn "$<" "$@"
+
+	## Check that this file is the same as the original fail-mbr:
+	@echo "Checking the file:"
+	$(OBJDUMP) -D -b binary -mi386 -Maddr16,data16 "$@" > f1.obj
+	$(OBJDUMP) -D -b binary -mi386 -Maddr16,data16 "$(srcdir)/[email protected]" > f2.obj
+
+	## The regular expression is used to reject lines which contain either:
+	## - the name of the file, "fail-mbr"
+	## - a line separator output by diff, "---"
+	## - the OP code "xor    %ax,%ax" which may begin by 0x31 or 0x33
+	## - a numerical offset output by diff, ^[a-f0-9]*$
+	@if diff f1.obj f2.obj | grep -qEv 'fail-mbr|---|xor    %ax,%ax|^[a-f0-9]*$$'; then \
+		echo "files $@ and [email protected] differ significantly:"; \
+		diff f1.obj f2.obj; \
+		exit 1; \
+	else \
+		echo "'[email protected]' and '[email protected]' have no significant differences."; \
+		rm f1.obj f2.obj; \
+		exit 0; \
+	fi
+else
+fail-mbr.bin: fail-mbr.bin.orig
+	@echo "The architecture is not x86, so the file '$@' is not compiled"
+	cp -vp "$<" "$@"
+endif