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# 46# For IA-64, we use r13 for the kernel globals pointer and we only use 47# a very small subset of float registers for integer divides. 48# 49.if ${MACHINE_ARCH} == "ia64" 50CFLAGS+= -ffixed-r13 -mfixed-range=f32-f127 -mno-sdata 51INLINE_LIMIT?= 15000 52.endif 53 54# 55# For sparc64 we want medlow code model, and we tell gcc to use floating 56# point emulation. This avoids using floating point registers for integer 57# operations which it has a tendency to do. 58# 59.if ${MACHINE_ARCH} == "sparc64" 60CFLAGS+= -mcmodel=medlow -msoft-float 61INLINE_LIMIT?= 15000 62.endif 63 64# 65# For AMD64, use a medium model for now. We'll switch to "kernel" 66# once pmap is ready. Be excessively careful to not generate FPU code. 67# 68.if ${MACHINE_ARCH} == "amd64" 69CFLAGS+= -mcmodel=kernel -mno-red-zone \ 70 -mfpmath=387 -mno-sse -mno-sse2 -mno-mmx -mno-3dnow \ 71 -msoft-float -fno-asynchronous-unwind-tables 72INLINE_LIMIT?= 8000 73.endif 74 75# 76# For PowerPC we tell gcc to use floating point emulation. This avoids using 77# floating point registers for integer operations which it has a tendency to do. 78# 79.if ${MACHINE_ARCH} == "powerpc" 80CFLAGS+= -msoft-float 81INLINE_LIMIT?= 15000 82.endif 83 84# 85# GCC 3.0 and above like to do certain optimizations based on the 86# assumption that the program is linked against libc. Stop this. 87# 88.if ${CC} == "icc" 89CFLAGS+= -nolib_inline 90.else 91CFLAGS+= -ffreestanding 92.endif 93 94.if ${CC} == "icc" 95CFLAGS+= -restrict 96.endif 97