https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80223
Fangrui Song <i at maskray dot me> changed:
What |Removed |Added
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CC| |i at maskray dot me
--- Comment #7 from Fangrui Song <i at maskray dot me> ---
Some notes.
{gcc,clang} -fsanitize-coverage={trace-pc,trace-cmp} is another coverage
feature. It uses no_sanitize_coverage instead of no_instrument_function. The
GCC support for no_sanitize_coverage is very new (by Martin, in 2021-05-25).
(In Clang, the feature has more modes, e.g. you can control func/bb/edge.)
The Linux kernel use case (include/linux/compiler_types.h ) uses 'noinline' so
inlining is not a concern.
/* Section for code which can't be instrumented at all */
#define noinstr \
noinline notrace __attribute((__section__(".noinstr.text"))) \
__no_kcsan __no_sanitize_address
Clang supports another filtering mechanism, -fprofile-list=
(https://reviews.llvm.org/D94820). But the kernel use case seems to prefer a
function attribute.
