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kbuild: expand inlining hints with -fdiagnostics-show-inlining-chain

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Clang recently added -fdiagnostics-show-inlining-chain [1] to improve
the visibility of inlining chains in diagnostics. This is particularly
useful for CONFIG_FORTIFY_SOURCE where detections can happen deep in
inlined functions.

Add this flag to KBUILD_CFLAGS under a cc-option so it is enabled if the
compiler supports it. Note that GCC does not have an equivalent flag as
it supports a similar diagnostic structure unconditionally.

Link: https://github.com/llvm/llvm-project/pull/174892 [1]
Link: https://github.com/ClangBuiltLinux/linux/issues/1571
Signed-off-by: Justin Stitt <justinstitt@google.com>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Kees Cook <kees@kernel.org>
Link: https://patch.msgid.link/20260330-kbuild-show-inlining-v2-1-c0c481a4ea7b@google.com
Signed-off-by: Nicolas Schier <nsc@kernel.org>
This commit is contained in:
Justin Stitt
2026-03-30 17:09:08 -07:00
committed by Nicolas Schier
parent d13a089d82
commit 404927758d
1 changed files with 4 additions and 0 deletions
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4
Makefile
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@@ -987,6 +987,10 @@ KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection)
# Get details on warnings generated due to GCC value tracking.
KBUILD_CFLAGS += $(call cc-option, -fdiagnostics-show-context=2)
# Show inlining notes for __attribute__((warning/error)) call chains.
# GCC supports this unconditionally while Clang 23+ provides a flag.
KBUILD_CFLAGS += $(call cc-option, -fdiagnostics-show-inlining-chain)
# Clear used registers at func exit (to reduce data lifetime and ROP gadgets).
ifdef CONFIG_ZERO_CALL_USED_REGS
KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr