1# $FreeBSD: src/share/mk/bsd.kern.mk,v 1.17.2.1 2001/08/01 16:56:56 obrien Exp $ 2# $DragonFly: src/sys/conf/bsd.kern.mk,v 1.2 2003/11/15 21:05:40 dillon Exp $ 3 4# 5# Warning flags for compiling the kernel and components of the kernel. 6# 7# Note that the newly added -Wcast-qual is responsible for generating 8# most of the remaining warnings. Warnings introduced with -Wall will 9# also pop up, but are easier to fix. 10# 11CWARNFLAGS?= -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes \ 12 -Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual \ 13 -fformat-extensions -ansi 14# 15# The following flags are next up for working on: 16# -W 17# 18# When working on removing warnings from code, the `-Werror' flag should be 19# of material assistance. 20# 21 22# 23# On the i386, do not align the stack to 16-byte boundaries. Otherwise GCC 24# 2.95 adds code to the entry and exit point of every function to align the 25# stack to 16-byte boundaries -- thus wasting approximately 12 bytes of stack 26# per function call. While the 16-byte alignment may benefit micro benchmarks, 27# it is probably an overall loss as it makes the code bigger (less efficient 28# use of code cache tag lines) and uses more stack (less efficient use of data 29# cache tag lines) 30# 31.if ${MACHINE_ARCH} == "i386" 32CFLAGS+= -mpreferred-stack-boundary=2 33.endif 34 35# 36# On the alpha, make sure that we don't use floating-point registers and 37# allow the use of EV56 instructions (only needed for low-level i/o). 38# 39.if ${MACHINE_ARCH} == "alpha" 40CFLAGS+= -mno-fp-regs -Wa,-mev56 41.endif 42 43# Prevent GCC 3.x from making certain libc based inline optimizations 44# 45CFLAGS+= -ffreestanding 46