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compiler_types: Disable __builtin_counted_by_ref for Clang

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Unfortunately, there is a corner case of __builtin_counted_by_ref()
usage that crashes[1] Clang since support was introduced in Clang 19.
Disable it prior to Clang 22. Found while tested kmalloc_obj treewide
refactoring (via kmalloc_flex() usage).

Link: https://github.com/llvm/llvm-project/issues/182575 [1]
Signed-off-by: Kees Cook <kees@kernel.org>
This commit is contained in:
Kees Cook 2026-02-20 13:15:58 -08:00
parent d79526b895
commit d39a1d7486
2 changed files with 7 additions and 1 deletions
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5
init/Kconfig
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@ -150,6 +150,11 @@ config CC_HAS_COUNTED_BY_PTR
# supported since gcc 16.0.0
default y if CC_IS_GCC && GCC_VERSION >= 160000
config CC_HAS_BROKEN_COUNTED_BY_REF
bool
# https://github.com/llvm/llvm-project/issues/182575
default y if CC_IS_CLANG && CLANG_VERSION < 220000
config CC_HAS_MULTIDIMENSIONAL_NONSTRING
def_bool $(success,echo 'char tag[][4] __attribute__((__nonstring__)) = { };' | $(CC) $(CLANG_FLAGS) -x c - -c -o /dev/null -Werror)