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sys: Disable -Walloc-size-larger-than for GCC 9+

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By default this warns about sizes larger than PTRDIFF_MAX passed to
malloc (rather than SIZE_MAX).  This doesn't trigger
deterministically, but it does trigger for kmalloc() of struct_size()
in iwlwifi's iwl_configure_rxq even when struct_size() is changed to
use PTRDIFF_MAX.  NB: struct_size() in Linux caps the size at
SIZE_MAX, not PTRDIFF_MAX via size_mul().

Reviewed by:	imp
Differential Revision:	https://reviews.freebsd.org/D42587
This commit is contained in:
John Baldwin 2023-11-14 18:37:25 -08:00
parent be909a79a8
commit ede077bf2a
1 changed files with 1 additions and 0 deletions
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sys/conf/kern.mk
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@ -76,6 +76,7 @@ CWARNEXTRA+= -Wno-error=packed-not-aligned
.endif
.if ${COMPILER_VERSION} >= 90100
CWARNEXTRA+= -Wno-address-of-packed-member \
-Wno-alloc-size-larger-than \
-Wno-error=alloca-larger-than=
.if ${COMPILER_VERSION} >= 120100
CWARNEXTRA+= -Wno-error=nonnull \