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Allow recursive configure/make 

Previously the ZFS configure was dependent on a correct Module{s}.symvers
file which is generated as one of the last steps of the full SPL build.
This meant you could not do a recursive configure because this will
configure all sub-packages before building any of them.

To resolve this issue the ZFS code has been updated to make a very
educated guess as to this file name at configure time.  This means
SPL_SYMBOLS may still be used in various places in the build system
such as modules/Makefile.in.  But we do give up the ability to
seemlessly detect symbols exported by the SPL at ZFS configure time.
At the moment this is not as issue, hopefully it will stay that way.
This commit is contained in:
Brian Behlendorf 2010-03-11 09:45:23 -08:00
parent 7223b8df33
commit 369293803b
1 changed files with 11 additions and 4 deletions
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15
config/kernel.m4
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@ -42,7 +42,7 @@ AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
])
dnl #
dnl # Detect name used more Module.symvers file
dnl # Detect name used for Module.symvers file in kernel
dnl #
AC_DEFUN([ZFS_AC_MODULE_SYMVERS], [
modpost=$LINUX/scripts/Makefile.modpost
@ -153,7 +153,14 @@ AC_DEFUN([ZFS_AC_KERNEL], [
])
dnl #
dnl # Detect name used for the additional SPL Module.symvers file
dnl # Detect name used for the additional SPL Module.symvers file. If one
dnl # does not exist this is likely because the SPL has been configured
dnl # but not built. To allow recursive builds a good guess is made as to
dnl # what this file will be named based on what it is named in the kernel
dnl # build products. This file will first be used at link time so if
dnl # the guess is wrong the build will fail then. This unfortunately
dnl # means the ZFS package does not contain a reliable mechanism to
dnl # detect symbols exported by the SPL at configure time.
dnl #
AC_DEFUN([ZFS_AC_SPL_MODULE_SYMVERS], [
AC_MSG_CHECKING([spl file name for module symbols])
@ -162,7 +169,7 @@ AC_DEFUN([ZFS_AC_SPL_MODULE_SYMVERS], [
elif test -r $SPL_OBJ/Modules.symvers; then
SPL_SYMBOLS=Modules.symvers
else
SPL_SYMBOLS=NONE
SPL_SYMBOLS=$LINUX_SYMBOLS
fi
AC_MSG_RESULT([$SPL_SYMBOLS])
@ -353,7 +360,7 @@ dnl #
AC_DEFUN([ZFS_CHECK_SYMBOL_EXPORT],
[AC_MSG_CHECKING([whether symbol $1 is exported])
grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
$LINUX_OBJ/Module*.symvers $SPL_OBJ/Module*.symvers 2>/dev/null
$LINUX_OBJ/$LINUX_SYMBOLS 2>/dev/null
rc=$?
if test $rc -ne 0; then
export=0