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6cf17f6538
Linux 5.16 by default fails the build on objtool warnings. We have known and understood objtool warnings we can't fix without involving Linux maintainers. To work around this we introduce an objtool wrapper script which removes the `--Werror` flag. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Attila Fülöp <attila@fueloep.org> Closes #17456
108 lines
2.8 KiB
Plaintext
108 lines
2.8 KiB
Plaintext
dnl #
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dnl # Detect objtool functionality.
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dnl #
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dnl #
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dnl # Kernel 5.10: linux/frame.h was renamed linux/objtool.h
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dnl #
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AC_DEFUN([ZFS_AC_KERNEL_OBJTOOL_HEADER], [
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AC_MSG_CHECKING([whether objtool header is available])
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ZFS_LINUX_TRY_COMPILE([
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#include <linux/objtool.h>
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],[
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],[
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objtool_header=$LINUX/include/linux/objtool.h
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AC_DEFINE(HAVE_KERNEL_OBJTOOL_HEADER, 1,
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[kernel has linux/objtool.h])
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AC_MSG_RESULT(linux/objtool.h)
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],[
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objtool_header=$LINUX/include/linux/frame.h
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AC_MSG_RESULT(linux/frame.h)
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])
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])
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dnl #
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dnl # Check for objtool support.
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dnl #
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AC_DEFUN([ZFS_AC_KERNEL_SRC_OBJTOOL], [
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dnl # 4.6 API for compile-time stack validation
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ZFS_LINUX_TEST_SRC([objtool], [
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#undef __ASSEMBLY__
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#include <asm/ptrace.h>
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#include <asm/frame.h>
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],[
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#if !defined(FRAME_BEGIN)
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#error "FRAME_BEGIN is not defined"
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#endif
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])
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dnl # 4.6 API added STACK_FRAME_NON_STANDARD macro
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ZFS_LINUX_TEST_SRC([stack_frame_non_standard], [
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#ifdef HAVE_KERNEL_OBJTOOL_HEADER
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#include <linux/objtool.h>
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#else
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#include <linux/frame.h>
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#endif
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],[
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#if !defined(STACK_FRAME_NON_STANDARD)
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#error "STACK_FRAME_NON_STANDARD is not defined."
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#endif
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])
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dnl # 6.15 made CONFIG_OBJTOOL_WERROR=y the default. We need to handle
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dnl # this or our build will fail.
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ZFS_LINUX_TEST_SRC([config_objtool_werror], [
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#if !defined(CONFIG_OBJTOOL_WERROR)
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#error "CONFIG_OBJTOOL_WERROR is not defined."
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#endif
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])
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])
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AC_DEFUN([ZFS_AC_KERNEL_OBJTOOL], [
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AC_MSG_CHECKING(
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[whether compile-time stack validation (objtool) is available])
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ZFS_LINUX_TEST_RESULT([objtool], [
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_KERNEL_OBJTOOL, 1,
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[kernel does stack verification])
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AC_MSG_CHECKING([whether STACK_FRAME_NON_STANDARD is defined])
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ZFS_LINUX_TEST_RESULT([stack_frame_non_standard], [
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_STACK_FRAME_NON_STANDARD, 1,
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[STACK_FRAME_NON_STANDARD is defined])
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dnl # Needed for kernels missing the asm macro. We grep
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dnl # for it in the header file since there is currently
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dnl # no test to check the result of assembling a file.
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AC_MSG_CHECKING(
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[whether STACK_FRAME_NON_STANDARD asm macro is defined])
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dnl # Escape square brackets.
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sp='@<:@@<:@:space:@:>@@:>@'
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dotmacro='@<:@.@:>@macro'
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regexp="^$sp*$dotmacro$sp+STACK_FRAME_NON_STANDARD$sp"
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AS_IF([$EGREP -s -q "$regexp" $objtool_header],[
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_STACK_FRAME_NON_STANDARD_ASM, 1,
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[STACK_FRAME_NON_STANDARD asm macro is defined])
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],[
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AC_MSG_RESULT(no)
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])
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],[
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AC_MSG_RESULT(no)
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])
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AC_MSG_CHECKING([whether CONFIG_OBJTOOL_WERROR is defined])
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ZFS_LINUX_TEST_RESULT([config_objtool_werror],[
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AC_MSG_RESULT(yes)
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CONFIG_OBJTOOL_WERROR_DEFINED=yes
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],[
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AC_MSG_RESULT(no)
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])
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],[
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AC_MSG_RESULT(no)
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])
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])
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