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Disable -Wzero-length-bounds for the kernel for GCC 12.

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The mlx5 driver and some other OFED bits use a somewhat dubious
pattern of:

  struct foo {
      uint64_t arg[0];
      /* Real members of a struct */
  };

The code then treats 'arg' as if it were really a kind of union
such that foo.arg[N] functions similarly to (uint64_t *)foo[N].
This uses of foo.arg[N] then trigger this warning.

No real bugs were found by this warning though, so just turn it off
globally.

Reviewed by:	hselasky, kib
Differential Revision:	https://reviews.freebsd.org/D37630
This commit is contained in:
John Baldwin 2022-12-21 10:47:08 -08:00
parent 2637ed558b
commit 1aa6d44dec
1 changed files with 2 additions and 1 deletions
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3
sys/conf/kern.mk
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@ -79,7 +79,8 @@ CWARNEXTRA+= -Wno-address-of-packed-member \
-Wno-error=alloca-larger-than=
.if ${COMPILER_VERSION} >= 120100
CWARNEXTRA+= -Wno-error=nonnull \
-Wno-dangling-pointer
-Wno-dangling-pointer \
-Wno-zero-length-bounds
.endif
.endif