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Since the integer wrapping sanitizer's behavior depends on its associated .scl file, we must force a full rebuild if the file changes. If not, instrumentation may differ between targets based on when they were built. Generate a new header file, integer-wrap.h, any time the Clang .scl file changes. Include the header file in compiler-version.h when its associated feature name, INTEGER_WRAP, is defined. This will be picked up by fixdep and force rebuilds where needed. Acked-by: Justin Stitt <justinstitt@google.com> Link: https://lore.kernel.org/r/20250503184623.2572355-3-kees@kernel.org Reviewed-by: Nicolas Schier <n.schier@avm.de> Signed-off-by: Kees Cook <kees@kernel.org>
21 lines
902 B
Makefile
21 lines
902 B
Makefile
# SPDX-License-Identifier: GPL-2.0-only
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#
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# fixdep: used to generate dependency information during build process
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hostprogs-always-y += fixdep
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# randstruct: the seed is needed before building the gcc-plugin or
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# before running a Clang kernel build.
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gen-randstruct-seed := $(srctree)/scripts/gen-randstruct-seed.sh
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quiet_cmd_create_randstruct_seed = GENSEED $@
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cmd_create_randstruct_seed = \
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$(CONFIG_SHELL) $(gen-randstruct-seed) \
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$@ $(objtree)/include/generated/randstruct_hash.h
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$(obj)/randstruct.seed: $(gen-randstruct-seed) FORCE
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$(call if_changed,create_randstruct_seed)
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always-$(CONFIG_RANDSTRUCT) += randstruct.seed
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# integer-wrap: if the .scl file changes, we need to do a full rebuild.
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$(obj)/../../include/generated/integer-wrap.h: $(srctree)/scripts/integer-wrap-ignore.scl FORCE
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$(call if_changed,touch)
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always-$(CONFIG_UBSAN_INTEGER_WRAP) += ../../include/generated/integer-wrap.h
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