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

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

1 files changed, 1 insertions, 1 deletions

diff --git a/tools/configure b/tools/configure
index 12b45bf890..7f5b5c6f5b 100755
--- a/tools/configure
+++ b/tools/configure
@@ -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=""