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toolchain: Globally use '-fno-strict-overflow'

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This turns on -fwrapv and -fwrapv-pointers.

As per GCC docs:

  "This option instructs the compiler to assume that signed arithmetic
   overflow of addition, subtraction and multiplication wraps around
   using twos-complement representation. This flag enables some
   optimizations and disables others."

All of our targets fall under this category.

For some time now we've been using -Wall which implies
-Wstrict-overflow=2, which only warns when the compiler actually
implements a possibly questionable optimization, so I'd expect this to
not affect our code size at all.

Change-Id: I8e1c10183e390c6d0897e81f84a5df4590b02d84
This commit is contained in:
Solomon Peachy 2022-12-01 10:32:00 -05:00
parent 100e9ac137
commit 8ff0fb6075
1 changed files with 1 additions and 1 deletions
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2
tools/configure vendored
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@ -8,7 +8,7 @@
#
# global CC options for all platforms
CCOPTS="-W -Wall -Wextra -Wundef -Os -nostdlib -ffreestanding -Wstrict-prototypes -pipe -std=gnu99 -funit-at-a-time -fno-delete-null-pointer-checks"
CCOPTS="-W -Wall -Wextra -Wundef -Os -nostdlib -ffreestanding -Wstrict-prototypes -pipe -std=gnu99 -funit-at-a-time -fno-delete-null-pointer-checks -fno-strict-overflow"
# LD options for the core
LDOPTS=""