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). Explicitly prohibit the use of SSE and other SIMD 29# operations inside the kernel itself. These operations are exclusively 30# reserved for user applications. 31# 32.if ${MACHINE_ARCH} == "i386" && ${CC} != "icc" 33CFLAGS+= -mno-align-long-strings -mpreferred-stack-boundary=2 \ 34 -mno-mmx -mno-3dnow -mno-sse -mno-sse2 -mno-sse3 35INLINE_LIMIT?= 8000 36.endif 37 38# 39# On the alpha, make sure that we don't use floating-point registers and 40# allow the use of BWX etc instructions (only needed for low-level i/o). 41# Also, reserve register t7 to point at per-cpu global variables. 42# 43.if ${MACHINE_ARCH} == "alpha" 44CFLAGS+= -mno-fp-regs -ffixed-8 -Wa,-mev6 45INLINE_LIMIT?= 15000 46.endif 47 48.if ${MACHINE_ARCH} == "arm" 49INLINE_LIMIT?= 8000 50.endif 51# 52# For IA-64, we use r13 for the kernel globals pointer and we only use 53# a very small subset of float registers for integer divides. 54# 55.if ${MACHINE_ARCH} == "ia64" 56CFLAGS+= -ffixed-r13 -mfixed-range=f32-f127 -mno-sdata 57INLINE_LIMIT?= 15000 58.endif 59 60# 61# For sparc64 we want medlow code model, and we tell gcc to use floating 62# point emulation. This avoids using floating point registers for integer 63# operations which it has a tendency to do. 64# 65.if ${MACHINE_ARCH} == "sparc64" 66CFLAGS+= -mcmodel=medlow -msoft-float 67INLINE_LIMIT?= 15000 68.endif 69 70# 71# For AMD64, we explicitly prohibit the use of FPU, SSE and other SIMD 72# operations inside the kernel itself. These operations are exclusively 73# reserved for user applications. 74# 75.if ${MACHINE_ARCH} == "amd64" 76CFLAGS+= -mcmodel=kernel -mno-red-zone \ 77 -mfpmath=387 -mno-sse -mno-sse2 -mno-mmx -mno-3dnow \ 78 -msoft-float -fno-asynchronous-unwind-tables 79INLINE_LIMIT?= 8000 80.endif 81 82# 83# For PowerPC we tell gcc to use floating point emulation. This avoids using 84# floating point registers for integer operations which it has a tendency to do. 85# 86.if ${MACHINE_ARCH} == "powerpc" 87CFLAGS+= -msoft-float 88INLINE_LIMIT?= 15000 89.endif 90 91# 92# GCC 3.0 and above like to do certain optimizations based on the 93# assumption that the program is linked against libc. Stop this. 94# 95.if ${CC} == "icc" 96CFLAGS+= -nolib_inline 97.else 98CFLAGS+= -ffreestanding 99.endif 100 101.if ${CC} == "icc" 102CFLAGS+= -restrict 103.endif 104