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 1.5 2004/02/24 18:07:11 joerg Exp $
5 # Warning flags for compiling the kernel and components of the kernel.
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.
11 .if ${CCVER} == "gcc2"
12 CWARNFLAGS?= -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes \
13 -Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual \
14 -fformat-extensions -ansi
16 CWARNFLAGS?= -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes \
17 -Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual \
21 # The following flags are next up for working on:
24 # When working on removing warnings from code, the `-Werror' flag should be
25 # of material assistance.
29 # On the i386, do not align the stack to 16-byte boundaries. Otherwise GCC
30 # 2.95 adds code to the entry and exit point of every function to align the
31 # stack to 16-byte boundaries -- thus wasting approximately 12 bytes of stack
32 # per function call. While the 16-byte alignment may benefit micro benchmarks,
33 # it is probably an overall loss as it makes the code bigger (less efficient
34 # use of code cache tag lines) and uses more stack (less efficient use of data
37 .if ${MACHINE_ARCH} == "i386"
38 CFLAGS+= -mpreferred-stack-boundary=2
42 # On the alpha, make sure that we don't use floating-point registers and
43 # allow the use of EV56 instructions (only needed for low-level i/o).
45 .if ${MACHINE_ARCH} == "alpha"
46 CFLAGS+= -mno-fp-regs -Wa,-mev56
49 # Require the proper use of 'extern' for variables. -fno-common will
50 # cause duplicate declarations to generate a link error.
54 # Prevent GCC 3.x from making certain libc based inline optimizations
56 CFLAGS+= -ffreestanding