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When checking for symbol exports, try compiling.

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This patch adds a new autoconf function: ZFS_LINUX_TRY_COMPILE_SYMBOL.
This new function does the following:

 - Call LINUX_TRY_COMPILE with the specified parameters.
 - If unsuccessful, return false.
 - If successful and we're configuring with --enable-linux-builtin,
   return true.
 - Else, call CHECK_SYMBOL_EXPORT with the specified parameters and
   return the result.

All calls to CHECK_SYMBOL_EXPORT are converted to
LINUX_TRY_COMPILE_SYMBOL so that the tests work even when configuring
for builtin on a kernel which doesn't have loadable module support, or
hasn't been built yet.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #851
This commit is contained in:
Etienne Dechamps
2012-07-25 14:38:58 -07:00
committed by Brian Behlendorf
parent fc88a6dda9
commit 705741827a
13 changed files with 1911 additions and 664 deletions
Download Patch File Download Diff File Expand all files Collapse all files
config/kernel.m4
+33 -15
View File
@@ -159,7 +159,7 @@ AC_DEFUN([ZFS_AC_KERNEL], [
], [test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}], [
kernelbuild=${kernelsrc}-obj/${target_cpu}/${target_cpu}
], [test -d ${kernelsrc}-obj/${target_cpu}/default], [
kernelbuild=${kernelsrc}-obj/${target_cpu}/default
kernelbuild=${kernelsrc}-obj/${target_cpu}/default
], [test -d `dirname ${kernelsrc}`/build-${target_cpu}], [
kernelbuild=`dirname ${kernelsrc}`/build-${target_cpu}
], [
@@ -491,30 +491,48 @@ dnl #
dnl # ZFS_CHECK_SYMBOL_EXPORT
dnl # check symbol exported or not
dnl #
AC_DEFUN([ZFS_CHECK_SYMBOL_EXPORT],
[AC_MSG_CHECKING([whether symbol $1 is exported])
AC_DEFUN([ZFS_CHECK_SYMBOL_EXPORT], [
grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
$LINUX_OBJ/$LINUX_SYMBOLS 2>/dev/null
rc=$?
AS_IF([test $rc -ne 0], [
if test $rc -ne 0; then
export=0
for file in $2; do
grep -q -E "EXPORT_SYMBOL.*($1)" "$LINUX/$file" 2>/dev/null
grep -q -E "EXPORT_SYMBOL.*($1)" \
"$LINUX/$file" 2>/dev/null
rc=$?
AS_IF([test $rc -eq 0], [
if test $rc -eq 0; then
export=1
break;
])
fi
done
AS_IF([test $export -eq 0], [
AC_MSG_RESULT([no])
if test $export -eq 0; then :
$4
], [
AC_MSG_RESULT([yes])
else :
$3
])
], [
AC_MSG_RESULT([yes])
fi
else :
$3
])
fi
])
dnl #
dnl # ZFS_LINUX_TRY_COMPILE_SYMBOL
dnl # like ZFS_LINUX_TRY_COMPILE, except ZFS_CHECK_SYMBOL_EXPORT
dnl # is called if not compiling for builtin
dnl #
AC_DEFUN([ZFS_LINUX_TRY_COMPILE_SYMBOL], [
ZFS_LINUX_TRY_COMPILE([$1], [$2], [rc=0], [rc=1])
if test $rc -ne 0; then :
$6
else
if test "x$enable_linux_builtin" != xyes; then
ZFS_CHECK_SYMBOL_EXPORT([$3], [$4], [rc=0], [rc=1])
fi
if test $rc -ne 0; then :
$6
else :
$5
fi
fi
])