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 ${_wundef} ${_Wno_pointer_sign} -fformat-extensions 16.if !defined(WITH_GCC3) 17_Wno_pointer_sign=-Wno-pointer-sign 18.endif 19.if !defined(NO_UNDEF) 20_wundef= -Wundef 21.endif 22.endif 23# 24# The following flags are next up for working on: 25# -W 26 27# 28# On the i386, do not align the stack to 16-byte boundaries. Otherwise GCC 29# 2.95 adds code to the entry and exit point of every function to align the 30# stack to 16-byte boundaries -- thus wasting approximately 12 bytes of stack 31# per function call. While the 16-byte alignment may benefit micro benchmarks, 32# it is probably an overall loss as it makes the code bigger (less efficient 33# use of code cache tag lines) and uses more stack (less efficient use of data 34# cache tag lines). Explicitly prohibit the use of SSE and other SIMD 35# operations inside the kernel itself. These operations are exclusively 36# reserved for user applications. 37# 38.if ${MACHINE_ARCH} == "i386" && ${CC} != "icc" 39CFLAGS+= -mno-align-long-strings -mpreferred-stack-boundary=2 \ 40 -mno-mmx -mno-3dnow -mno-sse -mno-sse2 -mno-sse3 41INLINE_LIMIT?= 8000 42.endif 43 44.if ${MACHINE_ARCH} == "arm" 45INLINE_LIMIT?= 8000 46.endif 47# 48# For IA-64, we use r13 for the kernel globals pointer and we only use 49# a very small subset of float registers for integer divides. 50# 51.if ${MACHINE_ARCH} == "ia64" 52CFLAGS+= -ffixed-r13 -mfixed-range=f32-f127 -fpic #-mno-sdata 53INLINE_LIMIT?= 15000 54.endif 55 56# 57# For sparc64 we want medlow code model, and we tell gcc to use floating 58# point emulation. This avoids using floating point registers for integer 59# operations which it has a tendency to do. 60# 61.if ${MACHINE_ARCH} == "sparc64" 62CFLAGS+= -mcmodel=medany -msoft-float 63INLINE_LIMIT?= 15000 64.endif 65 66# 67# For AMD64, we explicitly prohibit the use of FPU, SSE and other SIMD 68# operations inside the kernel itself. These operations are exclusively 69# reserved for user applications. 70# 71.if ${MACHINE_ARCH} == "amd64" 72CFLAGS+= -mcmodel=kernel -mno-red-zone \ 73 -mfpmath=387 -mno-sse -mno-sse2 -mno-sse3 -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# Also explicitly disable Altivec instructions inside the kernel. 82# 83.if ${MACHINE_ARCH} == "powerpc" 84CFLAGS+= -msoft-float -mno-altivec 85INLINE_LIMIT?= 15000 86.endif 87 88# 89# For MIPS we also tell gcc to use floating point emulation and 90# disable MIPS DSP ASE Instruction set. 91# 92.if ${MACHINE_ARCH} == "mips" 93CFLAGS+= -msoft-float -mno-dsp 94INLINE_LIMIT?= 15000 95.endif 96 97# 98# GCC 3.0 and above like to do certain optimizations based on the 99# assumption that the program is linked against libc. Stop this. 100# 101.if ${CC} == "icc" 102CFLAGS+= -nolib_inline 103.else 104CFLAGS+= -ffreestanding 105.endif 106 107.if ${CC} == "icc" 108CFLAGS+= -restrict 109.endif 110 111# 112# GCC SSP support. 113# 114.if ${MK_SSP} != "no" && ${CC} != "icc" && ${MACHINE_ARCH} != "ia64" && \ 115 ${MACHINE_ARCH} != "arm" && ${MACHINE_ARCH} != "mips" 116CFLAGS+= -fstack-protector 117.endif 118