freebsd-dev/tools/build/options/WITH_INIT_ALL_ZERO

.\" $FreeBSD$
Build the base system or kernel with stack variables initialized
to zero on function entry.
This option requires that the clang compiler be used.
Support initializing stack variables on function entry There are two options: - WITH_INIT_ALL_ZERO: Zero all variables on the stack. - WITH_INIT_ALL_PATTERN: Initialize variables with well-defined patterns. The exact pattern are a compiler implementation detail and vary by type. They are somewhat documented in the LLVM commit message: https://reviews.llvm.org/rL349442 I've used WITH_INIT_ALL_* to match Microsoft's InitAll feature rather than naming them after the LLVM specific compiler flags. In a range of consumer products, options like these are used in both debug and production builds with debugs builds using patterns (intended to provoke crashes on use of uninitialized values) and production using zeros (deemed more likely to lead to harmless misbehavior or NULL-pointer dereferences). Reviewed by: emaste Obtained from: CheriBSD Sponsored by: DARPA Differential Revision: https://reviews.freebsd.org/D27131 2020-11-10 19:15:13 +00:00			`.\" $FreeBSD$`
Drop 'Set to' from most src.conf(5) knobs The description is clearly what effect the knob has when set, so the additional text was unnecessary. Reviewed by: jhb, se Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D29583 2021-04-10 02:23:03 +00:00			`Build the base system or kernel with stack variables initialized`
Support initializing stack variables on function entry There are two options: - WITH_INIT_ALL_ZERO: Zero all variables on the stack. - WITH_INIT_ALL_PATTERN: Initialize variables with well-defined patterns. The exact pattern are a compiler implementation detail and vary by type. They are somewhat documented in the LLVM commit message: https://reviews.llvm.org/rL349442 I've used WITH_INIT_ALL_* to match Microsoft's InitAll feature rather than naming them after the LLVM specific compiler flags. In a range of consumer products, options like these are used in both debug and production builds with debugs builds using patterns (intended to provoke crashes on use of uninitialized values) and production using zeros (deemed more likely to lead to harmless misbehavior or NULL-pointer dereferences). Reviewed by: emaste Obtained from: CheriBSD Sponsored by: DARPA Differential Revision: https://reviews.freebsd.org/D27131 2020-11-10 19:15:13 +00:00			`to zero on function entry.`
			`This option requires that the clang compiler be used.`