[Pvfs2-cvs] commit by robl in pvfs2-1/maint/config: kernel.m4

[CVS commit program]

Update of /projects/cvsroot/pvfs2-1/maint/config
In directory parlweb1:/tmp/cvs-serv29683/maint/config

Modified Files:
	kernel.m4 
Log Message:
in 2.6.18.1 kernels, linux/config.h now complains whenever included.


Index: kernel.m4
===================================================================
RCS file: /projects/cvsroot/pvfs2-1/maint/config/kernel.m4,v
diff -u -w -p -u -r1.18 -r1.19
--- kernel.m4	20 Oct 2006 19:02:35 -0000	1.18
+++ kernel.m4	23 Oct 2006 22:25:41 -0000	1.19
@@ -586,6 +586,21 @@ AC_DEFUN([AX_KERNEL_FEATURES],
 		)
 	CFLAGS=$tmp_cflags
 
+	dnl In 2.6.18.1 and newer, including <linux/config.h> will throw off a
+	dnl warning 
+	tmp_cflags=${CFLAGS}
+	CFLAGS="${CFLAGS} -Werror"
+	AC_MSG_CHECKING(for warnings when including linux/config.h)
+	AC_TRY_COMPILE([
+		#define __KERNEL__
+		#include <linux/config.h>
+		], [], 
+		AC_MSG_RESULT(no)
+		AC_DEFINE(HAVE_NOWARNINGS_WHEN_INCLUDING_LINUX_CONFIG_H, 1, Define if including linux/config.h gives no warnings),
+		AC_MSG_RESULT(yes)
+	)
+	CFLAGS=$tmp_cflags
+
 	AC_MSG_CHECKING(for compat_ioctl member in file_operations structure)
 	AC_TRY_COMPILE([
 	    #define __KERNEL__