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 \ 32 -mno-mmx -mno-3dnow -mno-sse -mno-sse2 33INLINE_LIMIT?= 8000 34.endif 35 36# 37# On the alpha, make sure that we don't use floating-point registers and 38# allow the use of BWX etc instructions (only needed for low-level i/o). 39# Also, reserve register t7 to point at per-cpu global variables. 40# 41.if ${MACHINE_ARCH} == "alpha" 42CFLAGS+= -mno-fp-regs -ffixed-8 -Wa,-mev6 43INLINE_LIMIT?= 15000 44.endif 45 46.if ${MACHINE_ARCH} == "arm" 47INLINE_LIMIT?= 8000 48.endif 49# 50# For IA-64, we use r13 for the kernel globals pointer and we only use 51# a very small subset of float registers for integer divides. 52# 53.if ${MACHINE_ARCH} == "ia64" 54CFLAGS+= -ffixed-r13 -mfixed-range=f32-f127 -mno-sdata 55INLINE_LIMIT?= 15000 56.endif 57 58# 59# For sparc64 we want medlow code model, and we tell gcc to use floating 60# point emulation. This avoids using floating point registers for integer 61# operations which it has a tendency to do. 62# 63.if ${MACHINE_ARCH} == "sparc64" 64CFLAGS+= -mcmodel=medlow -msoft-float 65INLINE_LIMIT?= 15000 66.endif 67 68# 69# For AMD64, 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