diff options
| author | Xin Li <xin3.li@intel.com> | 2022-10-25 00:30:23 -0700 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2022-11-01 10:04:52 -0700 |
| commit | e1789d7c752ed001cf1a4bbbd624f70a7dd3c6db (patch) | |
| tree | dac3a0cb3895d47ab1743980cfbd480f8c467ea2 /init | |
| parent | 5a17f040fa332e71a45ca9ff02d6979d9176a423 (diff) | |
kbuild: upgrade the orphan section warning to an error if CONFIG_WERROR is set
Andrew Cooper suggested upgrading the orphan section warning to a hard link
error. However Nathan Chancellor said outright turning the warning into an
error with no escape hatch might be too aggressive, as we have had these
warnings triggered by new compiler generated sections, and suggested turning
orphan sections into an error only if CONFIG_WERROR is set. Kees Cook echoed
and emphasized that the mandate from Linus is that we should avoid breaking
builds. It wrecks bisection, it causes problems across compiler versions, etc.
Thus upgrade the orphan section warning to a hard link error only if
CONFIG_WERROR is set.
Suggested-by: Andrew Cooper <andrew.cooper3@citrix.com>
Suggested-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Xin Li <xin3.li@intel.com>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20221025073023.16137-2-xin3.li@intel.com
Diffstat (limited to 'init')
| -rw-r--r-- | init/Kconfig | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/init/Kconfig b/init/Kconfig index 694f7c160c9c..bb1225ef04e7 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -159,10 +159,12 @@ config WERROR help A kernel build should not cause any compiler warnings, and this enables the '-Werror' (for C) and '-Dwarnings' (for Rust) flags - to enforce that rule by default. + to enforce that rule by default. Certain warnings from other tools + such as the linker may be upgraded to errors with this option as + well. - However, if you have a new (or very old) compiler with odd and - unusual warnings, or you have some architecture with problems, + However, if you have a new (or very old) compiler or linker with odd + and unusual warnings, or you have some architecture with problems, you may need to disable this config option in order to successfully build the kernel. @@ -1454,6 +1456,13 @@ config LD_ORPHAN_WARN def_bool y depends on ARCH_WANT_LD_ORPHAN_WARN depends on $(ld-option,--orphan-handling=warn) + depends on $(ld-option,--orphan-handling=error) + +config LD_ORPHAN_WARN_LEVEL + string + depends on LD_ORPHAN_WARN + default "error" if WERROR + default "warn" config SYSCTL bool |