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# $FreeBSD$
#
# Warning flags for compiling the kernel and components of the kernel.
#
# Note that the newly added -Wcast-qual is responsible for generating
# most of the remaining warnings. Warnings introduced with -Wall will
# also pop up, but are easier to fix.
#
# XXX FIXME - revert when there is a gcc3 with -fformat-extensions
.ifndef GCC3
CWARNFLAGS?= -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes \
-Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual \
-fformat-extensions -ansi
.else
CWARNFLAGS?= -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes \
-Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual \
-Wno-format -ansi
.endif
#
# The following flags are next up for working on:
# -W
#
# When working on removing warnings from code, the `-Werror' flag should be
# of material assistance.
#
#
# On the i386, do not align the stack to 16-byte boundaries. Otherwise GCC
# 2.95 adds code to the entry and exit point of every function to align the
# stack to 16-byte boundaries -- thus wasting approximately 12 bytes of stack
# per function call. While the 16-byte alignment may benefit micro benchmarks,
# it is probably an overall loss as it makes the code bigger (less efficient
# use of code cache tag lines) and uses more stack (less efficient use of data
# cache tag lines)
#
.if ${MACHINE_ARCH} == "i386"
CFLAGS+= -mpreferred-stack-boundary=2
.endif
#
# On the alpha, make sure that we don't use floating-point registers and
# allow the use of EV56 instructions (only needed for low-level i/o).
# Also, reserve register t7 to point at per-cpu global variables.
#
.if ${MACHINE_ARCH} == "alpha"
CFLAGS+= -mno-fp-regs -ffixed-8 -Wa,-mev56
.endif
#
# For IA-64, we use r13 for the kernel globals pointer and we only use
# a very small subset of float registers for integer divides.
#
.if ${MACHINE_ARCH} == "ia64"
CFLAGS+= -ffixed-r13 -mfixed-range=f32-f127
.endif
#
# GCC 3.0 and above like to do certain optimizations based on the
# assumption that the program is linked against libc. Stop this.
#
.ifdef GCC3
CFLAGS+= -ffreestanding
.endif
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