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Linux build: handle CONFIG_OBJTOOL_WERROR=y

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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
This commit is contained in:
Attila Fülöp
2025-06-16 17:12:09 +02:00
committed by Tony Hutter
parent 52233a7253
commit 01ddee5df4
6 changed files with 97 additions and 0 deletions
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config/zfs-build.m4
+40
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@@ -205,6 +205,46 @@ AC_DEFUN([ZFS_AC_DEBUG_INVARIANTS], [
AC_MSG_RESULT([$enable_invariants])
])
dnl # Disabled by default. If enabled allows a configured "turn objtools
dnl # warnings into errors" (CONFIG_OBJTOOL_WERROR) behavior to take effect.
dnl # If disabled, objtool warnings are never turned into errors. It can't
dnl # be enabled if the kernel wasn't compiled with CONFIG_OBJTOOL_WERROR=y.
dnl #
AC_DEFUN([ZFS_AC_OBJTOOL_WERROR], [
AC_MSG_CHECKING([whether objtool error on warning behavior is enabled])
AC_ARG_ENABLE([objtool-werror],
[AS_HELP_STRING([--enable-objtool-werror],
[Enable objtool's error on warning behaviour if present @<:@default=no@:>@])],
[enable_objtool_werror=$enableval],
[enable_objtool_werror=no])
AC_MSG_RESULT([$enable_objtool_werror])
AS_IF([test x$CONFIG_OBJTOOL_WERROR_DEFINED = xyes],[
AS_IF([test x$enable_objtool_werror = xyes],[
AC_MSG_NOTICE([enable-objtool-werror defined, keeping -Werror ])
],[
AC_MSG_NOTICE([enable-objtool-werror undefined, disabling -Werror ])
OBJTOOL_DISABLE_WERROR=y
abs_objtool_binary=$kernelsrc/tools/objtool/objtool
AS_IF([test -x $abs_objtool_binary],[],[
AC_MSG_ERROR([*** objtool binary $abs_objtool_binary not found])
])
dnl # The path to the wrapper is defined in modules/Makefile.in.
])
],[
dnl # We can't enable --Werror if it's not there.
AS_IF([test x$enable_objtool_werror = xyes],[
AC_MSG_ERROR([
*** Cannot enable objtool-werror,
*** a kernel built with CONFIG_OBJTOOL_WERROR=y is required.
])
],[])
])
AC_SUBST(OBJTOOL_DISABLE_WERROR)
AC_SUBST(abs_objtool_binary)
])
AC_DEFUN([ZFS_AC_CONFIG_ALWAYS], [
AX_COUNT_CPUS([])
AC_SUBST(CPU_COUNT)