improve checks for exported symbols. This allow run check without sources, but with

[fs/lustre-release.git] / build / autoconf / lustre-build-linux.m4

diff --git a/build/autoconf/lustre-build-linux.m4 b/build/autoconf/lustre-build-linux.m4
index 14895fb..2608f9a 100644 (file)
--- a/build/autoconf/lustre-build-linux.m4
+++ b/build/autoconf/lustre-build-linux.m4
@@ -55,8 +55,13 @@ AC_DEFUN([LB_LINUX_RELEASE],
 [LINUXRELEASE=
 rm -f build/conftest.i
 AC_MSG_CHECKING([for Linux release])
+if test -s $LINUX_OBJ/include/linux/utsrelease.h ; then
+       LINUXRELEASEHEADER=utsrelease.h
+else
+       LINUXRELEASEHEADER=version.h
+fi
 LB_LINUX_TRY_MAKE([
-       #include <linux/version.h>
+       #include <linux/$LINUXRELEASEHEADER>
 ],[
        char *LINUXRELEASE;
        LINUXRELEASE=UTS_RELEASE;
@@ -110,6 +115,10 @@ AC_ARG_WITH([linux],
 AC_MSG_RESULT([$LINUX])
 AC_SUBST(LINUX)
 
+# -------- check for linux --------
+LB_CHECK_FILE([$LINUX],[],
+       [AC_MSG_ERROR([Kernel source $LINUX could not be found.])])
+
 # -------- linux objects (for 2.6) --
 AC_MSG_CHECKING([for Linux objects dir])
 AC_ARG_WITH([linux-obj],
@@ -120,7 +129,7 @@ AC_ARG_WITH([linux-obj],
 AC_MSG_RESULT([$LINUX_OBJ])
 AC_SUBST(LINUX_OBJ)
 
-# -------- check for .confg --------
+# -------- check for .config --------
 AC_ARG_WITH([linux-config],
        [AC_HELP_STRING([--with-linux-config=path],
                        [set path to Linux .conf (default=$LINUX_OBJ/.config)])],
@@ -143,10 +152,19 @@ LB_CHECK_FILE([$LINUX_CONFIG],[],
        [AC_MSG_ERROR([Kernel config could not be found.  If you are building from a kernel-source rpm consult build/README.kernel-source])])
 
 # ----------- make dep run? ------------------
+# at 2.6.19 # $LINUX/include/linux/config.h is removed
+# and at more old has only one line
+# include <autoconf.h>
 LB_CHECK_FILES([$LINUX_OBJ/include/linux/autoconf.h
                $LINUX_OBJ/include/linux/version.h
-               $LINUX/include/linux/config.h],[],
+               ],[],
        [AC_MSG_ERROR([Run make config in $LINUX.])])
+#
+LB_CHECK_FILE([$LINUX_OBJ/include/linux/config.h],
+       [ AC_DEFINE(HAVE_KERNEL_CONFIG_H, 1,
+               [kernel modules need to include config.h])
+       ]
+)
 
 # ------------ rhconfig.h includes runtime-generated bits --
 # red hat kernel-source checks
@@ -227,6 +245,21 @@ $1
 _ACEOF
 ])
 
+
+# LB_LANG_PROGRAM(C)([PROLOGUE], [BODY])
+# --------------------------------------
+m4_define([LB_LANG_PROGRAM],
+[$1
+int
+main (void)
+{
+dnl Do *not* indent the following line: there may be CPP directives.
+dnl Don't move the `;' right after for the same reason.
+$2
+  ;
+  return 0;
+}])
+
 #
 # LB_LINUX_COMPILE_IFELSE
 #
@@ -249,7 +282,7 @@ rm -f build/conftest.o build/conftest.mod.c build/conftest.mod.o build/conftest.
 #
 AC_DEFUN([LB_LINUX_TRY_COMPILE],
 [LB_LINUX_COMPILE_IFELSE(
-       [AC_LANG_PROGRAM([[$1]], [[$2]])],
+       [AC_LANG_SOURCE([LB_LANG_PROGRAM([[$1]], [[$2]])])],
        [modules],
        [test -s build/conftest.o],
        [$3], [$4])])
@@ -261,7 +294,11 @@ AC_DEFUN([LB_LINUX_TRY_COMPILE],
 #
 AC_DEFUN([LB_LINUX_CONFIG],
 [AC_MSG_CHECKING([if Linux was built with CONFIG_$1])
-LB_LINUX_TRY_COMPILE([#include <linux/config.h>],[
+LB_LINUX_TRY_COMPILE([
+#ifdef HAVE_KERNEL_CONFIG_H
+#include <linux/config.h>
+#endif
+],[
 #ifndef CONFIG_$1
 #error CONFIG_$1 not #defined
 #endif
@@ -275,12 +312,32 @@ $3
 ])
 
 #
+# LB_LINUX_CONFIG_IM
+#
+# check if a given config option is builtin or as module
+#
+AC_DEFUN([LB_LINUX_CONFIG_IM],
+[AC_MSG_CHECKING([if Linux was built with CONFIG_$1 in or as module])
+LB_LINUX_TRY_COMPILE([#include <linux/config.h>],[
+#if !(defined(CONFIG_$1) || defined(CONFIG_$1_MODULE))
+#error CONFIG_$1 and CONFIG_$1_MODULE not #defined
+#endif
+],[
+AC_MSG_RESULT([yes])
+$2
+],[
+AC_MSG_RESULT([no])
+$3
+])
+])
+
+#
 # LB_LINUX_TRY_MAKE
 #
 # like LB_LINUX_TRY_COMPILE, but with different arguments
 #
 AC_DEFUN([LB_LINUX_TRY_MAKE],
-[LB_LINUX_COMPILE_IFELSE([AC_LANG_PROGRAM([[$1]], [[$2]])], [$3], [$4], [$5], [$6])])
+[LB_LINUX_COMPILE_IFELSE([AC_LANG_SOURCE([LB_LANG_PROGRAM([[$1]], [[$2]])])], [$3], [$4], [$5], [$6])])
 
 #
 # LB_LINUX_CONFIG_BIG_STACK
@@ -327,16 +384,14 @@ if test "x$ARCH_UM" = "x" ; then
 fi
 ])
 
-#LB_LINUX_CONFIG_BIG_STACK
-
-# LNet tests
-LN_PROG_LINUX
+LB_LINUX_CONFIG([KMOD],[],[
+       AC_MSG_WARN([])
+       AC_MSG_WARN([Kernel module loading support is highly recommended.])
+       AC_MSG_WARN([])
+])
 
-# Portals tests
-#LP_PROG_LINUX
+#LB_LINUX_CONFIG_BIG_STACK
 
-# Lustre tests
-LC_PROG_LINUX
 ])
 
 #
@@ -347,3 +402,41 @@ LC_PROG_LINUX
 AC_DEFUN([LB_LINUX_CONDITIONALS],
 [AM_CONDITIONAL(LINUX25, test x$linux25 = xyes)
 ])
+
+
+#
+# LB_CHECK_SYMBOL_EXPORT
+# check symbol exported or not 
+# $1 - symbol
+# $2 - file(s) for find.
+# $3 - do 'yes'
+# $4 - do 'no'
+#
+# 2.6 based kernels - put modversion info into $LINUX/Module.modvers
+# or check 
+AC_DEFUN([LB_CHECK_SYMBOL_EXPORT],
+[AC_MSG_CHECKING([if Linux was built with symbol $1 is exported])
+grep -q -E '[[[:space:]]]$1[[[:space:]]]' $LINUX/Module.symvers 2>/dev/null
+rc=$?
+if test $rc -ne 0; then
+    export=0
+    for file in $2; do
+       grep -q -E "EXPORT_SYMBOL.*($1)" "$LINUX/$file" 2>/dev/null
+       rc=$?
+       if test $rc -eq 0; then
+               export=1
+               break;
+       fi
+    done
+    if test $export -eq 0; then
+       AC_MSG_RESULT([no])
+       $4
+    else
+       AC_MSG_RESULT([yes])
+       $3
+    fi
+else
+    AC_MSG_RESULT([yes])
+    $3
+fi
+])