1# $FreeBSD$ 2 3# 4# Warning flags for compiling the kernel and components of the kernel. 5# 6# Note that the newly added -Wcast-qual is responsible for generating 7# most of the remaining warnings. Warnings introduced with -Wall will 8# also pop up, but are easier to fix. 9.if ${CC} == "icc" 10#CWARNFLAGS= -w2 # use this if you are terribly bored 11CWARNFLAGS= 12.else 13CWARNFLAGS?= -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes \ 14 -Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual \ 15 -fformat-extensions -std=c99 16.endif 17# 18# The following flags are next up for working on: 19# -W 20 21# 22# On the i386, do not align the stack to 16-byte boundaries. Otherwise GCC 23# 2.95 adds code to the entry and exit point of every function to align the 24# stack to 16-byte boundaries -- thus wasting approximately 12 bytes of stack 25# per function call. While the 16-byte alignment may benefit micro benchmarks, 26# it is probably an overall loss as it makes the code bigger (less efficient 27# use of code cache tag lines) and uses more stack (less efficient use of data 28# cache tag lines) 29# 30.if ${MACHINE_ARCH} == "i386" && ${CC} != "icc" 31CFLAGS+= -mno-align-long-strings -mpreferred-stack-boundary=2 32INLINE_LIMIT?= 8000 33.endif 34 35# 36# On the alpha, make sure that we don't use floating-point registers and 37# allow the use of BWX etc instructions (only needed for low-level i/o). 38# Also, reserve register t7 to point at per-cpu global variables. 39# 40.if ${MACHINE_ARCH} == "alpha" 41CFLAGS+= -mno-fp-regs -ffixed-8 -Wa,-mev6 42INLINE_LIMIT?= 15000 43.endif 44 45.if ${MACHINE_ARCH} == "arm" 46INLINE_LIMIT?= 8000 47.endif 48# 49# For IA-64, we use r13 for the kernel globals pointer and we only use 50# a very small subset of float registers for integer divides. 51# 52.if ${MACHINE_ARCH} == "ia64" 53CFLAGS+= -ffixed-r13 -mfixed-range=f32-f127 -mno-sdata 54INLINE_LIMIT?= 15000 55.endif 56 57# 58# For sparc64 we want medlow code model, and we tell gcc to use floating 59# point emulation. This avoids using floating point registers for integer 60# operations which it has a tendency to do. 61# 62.if ${MACHINE_ARCH} == "sparc64" 63CFLAGS+= -mcmodel=medlow -msoft-float 64INLINE_LIMIT?= 15000 65.endif 66 67# 68# For AMD64, use a medium model for now. We'll switch to "kernel" 69# once pmap is ready. Be excessively careful to not generate FPU code. 70# 71.if ${MACHINE_ARCH} == "amd64" 72CFLAGS+= -mcmodel=kernel -mno-red-zone \ 73 -mfpmath=387 -mno-sse -mno-sse2 -mno-mmx -mno-3dnow \ 74 -msoft-float -fno-asynchronous-unwind-tables 75INLINE_LIMIT?= 8000 76.endif 77 78# 79# For PowerPC we tell gcc to use floating point emulation. This avoids using 80# floating point registers for integer operations which it has a tendency to do. 81# 82.if ${MACHINE_ARCH} == "powerpc" 83CFLAGS+= -msoft-float 84INLINE_LIMIT?= 15000 85.endif 86 87# 88# GCC 3.0 and above like to do certain optimizations based on the 89# assumption that the program is linked against libc. Stop this. 90# 91.if ${CC} == "icc" 92CFLAGS+= -nolib_inline 93.else 94CFLAGS+= -ffreestanding 95.endif 96 97.if ${CC} == "icc" 98CFLAGS+= -restrict 99.endif 100