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(NO_UNDEF) 17_wundef= -Wundef 18.endif 19.endif 20# 21# The following flags are next up for working on: 22# -W 23 24# 25# On the i386, do not align the stack to 16-byte boundaries. Otherwise GCC 26# 2.95 adds code to the entry and exit point of every function to align the 27# stack to 16-byte boundaries -- thus wasting approximately 12 bytes of stack 28# per function call. While the 16-byte alignment may benefit micro benchmarks, 29# it is probably an overall loss as it makes the code bigger (less efficient 30# use of code cache tag lines) and uses more stack (less efficient use of data 31# cache tag lines). Explicitly prohibit the use of SSE and other SIMD 32# operations inside the kernel itself. These operations are exclusively 33# reserved for user applications. 34# 35.if ${MACHINE_ARCH} == "i386" && ${CC} != "icc" 36CFLAGS+= -mno-align-long-strings -mpreferred-stack-boundary=2 \ 37 -mno-mmx -mno-3dnow -mno-sse -mno-sse2 -mno-sse3 38INLINE_LIMIT?= 8000 39.endif 40 41.if ${MACHINE_ARCH} == "arm" 42INLINE_LIMIT?= 8000 43.endif 44# 45# For IA-64, we use r13 for the kernel globals pointer and we only use 46# a very small subset of float registers for integer divides. 47# 48.if ${MACHINE_ARCH} == "ia64" 49CFLAGS+= -ffixed-r13 -mfixed-range=f32-f127 -fpic #-mno-sdata 50INLINE_LIMIT?= 15000 51.endif 52 53# 54# For sparc64 we want medlow code model, and we tell gcc to use floating 55# point emulation. This avoids using floating point registers for integer 56# operations which it has a tendency to do. 57# 58.if ${MACHINE_ARCH} == "sparc64" 59CFLAGS+= -mcmodel=medany -msoft-float 60INLINE_LIMIT?= 15000 61.endif 62 63# 64# For AMD64, we explicitly prohibit the use of FPU, SSE and other SIMD 65# operations inside the kernel itself. These operations are exclusively 66# reserved for user applications. 67# 68.if ${MACHINE_ARCH} == "amd64" 69CFLAGS+= -mcmodel=kernel -mno-red-zone \ 70 -mfpmath=387 -mno-sse -mno-sse2 -mno-sse3 -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# Also explicitly disable Altivec instructions inside the kernel. 79# 80.if ${MACHINE_ARCH} == "powerpc" 81CFLAGS+= -msoft-float -mno-altivec 82INLINE_LIMIT?= 15000 83.endif 84 85# 86# For MIPS we also tell gcc to use floating point emulation 87# 88.if ${MACHINE_ARCH} == "mips" 89CFLAGS+= -msoft-float 90INLINE_LIMIT?= 8000 91.endif 92 93# 94# GCC 3.0 and above like to do certain optimizations based on the 95# assumption that the program is linked against libc. Stop this. 96# 97.if ${CC} == "icc" 98CFLAGS+= -nolib_inline 99.else 100CFLAGS+= -ffreestanding 101.endif 102 103.if ${CC} == "icc" 104CFLAGS+= -restrict 105.endif 106 107# 108# GCC SSP support. 109# 110.if ${MK_SSP} != "no" && ${CC} != "icc" && ${MACHINE_ARCH} != "ia64" && \ 111 ${MACHINE_ARCH} != "arm" && ${MACHINE_ARCH} != "mips" 112CFLAGS+= -fstack-protector 113.endif 114