Linux: Add autoconf macro for structure checks

[openafs.git] / src / cf / linux-test1.m4

diff --git a/src/cf/linux-test1.m4 b/src/cf/linux-test1.m4
index 758e002..6545717 100644 (file)
--- a/src/cf/linux-test1.m4
+++ b/src/cf/linux-test1.m4
@@ -2,9 +2,12 @@
 #                 [ACTION-IF-SUCCESS], [ACTION-IF-FAILURE])
 #
 AC_DEFUN([AC_TRY_KBUILD26],[  rm -fr conftest.dir
+  if test "x$ac_linux_kbuild_requires_extra_cflags" = "xyes" ; then
+    CFLAGS_PREFIX='EXTRA_'
+  fi
   if mkdir conftest.dir &&
     cat >conftest.dir/Makefile <<_ACEOF &&
-CFLAGS += $CPPFLAGS
+${CFLAGS_PREFIX}CFLAGS += $CPPFLAGS
 
 obj-m += conftest.o
 _ACEOF
@@ -24,8 +27,9 @@ $2
 
 MODULE_LICENSE("http://www.openafs.org/dl/license10.html");
 _ACEOF
-    echo make -C $LINUX_KERNEL_PATH M=$SRCDIR_PARENT/conftest.dir modules KBUILD_VERBOSE=1 >&AS_MESSAGE_LOG_FD
-    make -C $LINUX_KERNEL_PATH M=$SRCDIR_PARENT/conftest.dir modules KBUILD_VERBOSE=1 >&AS_MESSAGE_LOG_FD 2>conftest.err
+    echo make -C $LINUX_KERNEL_BUILD M=$SRCDIR_PARENT/conftest.dir modules KBUILD_VERBOSE=1 >&AS_MESSAGE_LOG_FD &&
+    make -C $LINUX_KERNEL_BUILD M=$SRCDIR_PARENT/conftest.dir modules KBUILD_VERBOSE=1 >&AS_MESSAGE_LOG_FD 2>conftest.err &&
+    ! grep -i "WARNING: .* undefined!$" conftest.err >/dev/null 2>&1
     then [$3]
     else
       sed '/^ *+/d' conftest.err >&AS_MESSAGE_LOG_FD
@@ -42,8 +46,10 @@ _ACEOF
 #
 AC_DEFUN([AC_TRY_KBUILD24], [
   ac_save_CPPFLAGS="$CPPFLAGS"
-  CPPFLAGS="-I$LINUX_KERNEL_PATH/include -D__KERNEL__ $CPPFLAGS"
-  AC_TRY_COMPILE([$1], [$2], [$3], [$4])
+  CPPFLAGS="-I$LINUX_KERNEL_PATH/include -D__KERNEL__ -Werror-implicit-function-declaration $CPPFLAGS"
+  AC_TRY_COMPILE([
+#include <linux/kernel.h>
+$1], [$2], [$3], [$4])
   CPPFLAGS="$ac_save_CPPFLAGS"])
 
 
@@ -65,3 +71,62 @@ AC_DEFUN([LINUX_KERNEL_COMPILE_WORKS], [
     [],:,AC_MSG_RESULT(no)
     AC_MSG_FAILURE([Fix problem or use --disable-kernel-module...]))
   AC_MSG_RESULT(yes)])
+
+AC_DEFUN([LINUX_KBUILD_USES_EXTRA_CFLAGS], [
+  AC_MSG_CHECKING([if linux kbuild requires EXTRA_CFLAGS])
+  save_CPPFLAGS="$CPPFLAGS"
+  CPPFLAGS=-Wall
+  AC_TRY_KBUILD(
+[#include <linux/sched.h>
+#include <linux/fs.h>],
+    [],
+    ac_linux_kbuild_requires_extra_cflags=no,
+    ac_linux_kbuild_requires_extra_cflags=yes)
+    CPPFLAGS="$save_CPPFLAGS"
+    AC_MSG_RESULT($ac_linux_kbuild_requires_extra_cflags)])
+
+dnl AC_CHECK_LINUX_HEADER(header)
+AC_DEFUN([AC_CHECK_LINUX_HEADER],
+ [AS_VAR_PUSHDEF([ac_linux_header], [ac_cv_linux_header_$1])dnl
+  AC_CACHE_CHECK([for linux/$1], [ac_linux_header],
+   [AC_TRY_KBUILD([#include <linux/$1>],
+                 [return;],
+                 AS_VAR_SET([ac_linux_header], [yes]),
+                 AS_VAR_SET([ac_linux_header], [no]))
+   ])
+  AS_IF([test AS_VAR_GET([ac_linux_header]) = yes],
+        [AC_DEFINE(AS_TR_CPP(HAVE_LINUX_$1),
+                 1,
+                 [Define if your kernel has linux/$1])])
+ ])
+
+dnl AC_CHECK_LINUX_FUNC([function], [includes], [code])
+AC_DEFUN([AC_CHECK_LINUX_FUNC],
+ [AS_VAR_PUSHDEF([ac_linux_func], [ac_cv_linux_func_$1])dnl
+  AC_CACHE_CHECK([for $1], [ac_linux_func],
+    [save_CPPFLAGS="$CPPFLAGS"
+     CPPFLAGS="$CPPFLAGS -Werror-implicit-function-declaration"
+     AC_TRY_KBUILD([$2], [$3],
+                  AS_VAR_SET([ac_linux_func], [yes]),
+                  AS_VAR_SET([ac_linux_func], [no]))
+     CPPFLAGS="$save_CPPFLAGS"
+    ])
+  AS_IF([test AS_VAR_GET([ac_linux_func]) = yes],
+       [AC_DEFINE(AS_TR_CPP(HAVE_LINUX_$1), 1,
+                  [Define if your kernel has the $1 function])])
+ ])
+
+dnl AC_CHECK_LINUX_STRUCT([structure], [element], [includes])
+AC_DEFUN([AC_CHECK_LINUX_STRUCT],
+ [AS_VAR_PUSHDEF([ac_linux_struct], [ac_cv_linux_struct_$1_has_$2])dnl
+  AC_CACHE_CHECK([for $2 in struct $1], [ac_linux_struct],
+   [AC_TRY_KBUILD([#include <linux/$3>],
+                 [struct $1 _test; printk("%x\n", &_test.$2); ],
+                 AS_VAR_SET([ac_linux_struct], [yes]),
+                 AS_VAR_SET([ac_linux_struct], [no]))
+   ])
+  AS_IF([test AS_VAR_GET([ac_linux_struct]) = yes],
+       [AC_DEFINE(AS_TR_CPP(STRUCT_$1_HAS_$2), 1,
+                  [Define if kernel struct $1 has the $2 element])])
+ ])
+