To allow additional flags, set CGO_CFLAGS_ALLOW to a regular expression
matching the new flags. To disallow flags that would otherwise be allowed,
set CGO_CFLAGS_DISALLOW to a regular expression matching arguments
that must be disallowed. In both cases the regular expression must match
a full argument: to allow -mfoo=bar, use CGO_CFLAGS_ALLOW='-mfoo.*',
not just CGO_CFLAGS_ALLOW='-mfoo'. Similarly named variables control

H = $(shell printf "\033[34;1m=>\033[0m")

ifeq ($(origin DEBUG), undefined)
  BUILDTYPE_DIR:=release
else ifeq ($(DEBUG),0)
  BUILDTYPE_DIR:=release
else
  BUILDTYPE_DIR:=debug
  export GCFLAGS:=all=-N -l
  $(info $(H) Build with debugger information)
endif

# Optional file including user-specific settings (HUB, TAG, etc)
-include .istiorc.mk