[MULTIBOOT2 SPEC PATCH v4 03/27] multiboot2: Use m4 quoting and AS_HELP_STRING

[Hans Ulrich Niedermann]

Use proper m4 quoting throughout configure.ac and use AS_HELP_STRING
for the --enable-example-kernel argument.

Signed-off-by: Hans Ulrich Niedermann <address@hidden>

diff --git a/configure.ac b/configure.ac
index 8f21b1852..5bfc0ee5b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -12,7 +12,7 @@ dnl "AS IS" CONDITION.  THE FREE SOFTWARE FOUNDATION 
DISCLAIMS ANY
 dnl LIABILITY OF ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE
 dnl USE OF THIS SOFTWARE.
 
-AC_PREREQ(2.63)
+AC_PREREQ([2.63])
 AC_INIT([Multiboot], [2.0], [address@hidden])
 AC_CONFIG_SRCDIR([doc/multiboot.texi])
 AC_CONFIG_HEADER([config.h])
@@ -22,7 +22,7 @@ AM_INIT_AUTOMAKE
 # Programs
 #
 
-AC_CHECK_TOOL(CC, gcc)
+AC_CHECK_TOOL([CC], [gcc])
 AC_PROG_CC
 AM_PROG_AS
 # We need this for older versions of Autoconf.
@@ -30,17 +30,19 @@ _AM_DEPENDENCIES(CC)
 
 dnl Because recent automake complains about AS, set it here.
 CCAS="$CC"
-AC_SUBST(CCAS)
+AC_SUBST([CCAS])
 
-dnl Build the example Multiboot kernel.
-AC_ARG_ENABLE(example-kernel,
-  [  --enable-example-kernel
-                          build the example Multiboot kernel])
-AM_CONDITIONAL(BUILD_EXAMPLE_KERNEL, test "x$enable_example_kernel" = xyes)
+dnl Build the example Multiboot2 kernel.
+AC_ARG_ENABLE([example-kernel], [dnl
+AS_HELP_STRING([--enable-example-kernel],
+               [build the example Multiboot2 kernel])])
+
+AM_CONDITIONAL([BUILD_EXAMPLE_KERNEL],
+               [test "x$enable_example_kernel" = xyes])
 
 dnl Because recent automake complains about CCASFLAGS, set it here.
 CCASFLAGS='$(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(CPPFLAGS) $(CFLAGS)'
-AC_SUBST(CCASFLAGS)
+AC_SUBST([CCASFLAGS])
 
 CFLAGS="-nostdlib $CFLAGS"
 
-- 
2.26.2