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:T:Micc} == "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.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_CPUARCH} == "i386" && ${CC:T:Micc} != "icc" 33.if ${CC:T:Mclang} != "clang" 34CFLAGS+= -mno-align-long-strings -mpreferred-stack-boundary=2 35.endif 36CFLAGS+= -mno-mmx -mno-3dnow -mno-sse -mno-sse2 -mno-sse3 -msoft-float 37INLINE_LIMIT?= 8000 38.endif 39 40.if ${MACHINE_CPUARCH} == "arm" 41INLINE_LIMIT?= 8000 42.endif 43# 44# For IA-64, we use r13 for the kernel globals pointer and we only use 45# a very small subset of float registers for integer divides. 46# 47.if ${MACHINE_CPUARCH} == "ia64" 48CFLAGS+= -ffixed-r13 -mfixed-range=f32-f127 -fpic #-mno-sdata 49INLINE_LIMIT?= 15000 50.endif 51 52# 53# For sparc64 we want medlow code model, and we tell gcc to use floating 54# point emulation. This avoids using floating point registers for integer 55# operations which it has a tendency to do. 56# 57.if ${MACHINE_CPUARCH} == "sparc64" 58CFLAGS+= -mcmodel=medany -msoft-float 59INLINE_LIMIT?= 15000 60.endif 61 62# 63# For AMD64, we explicitly prohibit the use of FPU, SSE and other SIMD 64# operations inside the kernel itself. These operations are exclusively 65# reserved for user applications. 66# 67.if ${MACHINE_CPUARCH} == "amd64" 68CFLAGS+= -mcmodel=kernel -mno-red-zone \ 69 -mfpmath=387 -mno-mmx -mno-3dnow -mno-sse -mno-sse2 -mno-sse3 \ 70 -msoft-float -fno-asynchronous-unwind-tables 71INLINE_LIMIT?= 8000 72.endif 73 74# 75# For PowerPC we tell gcc to use floating point emulation. This avoids using 76# floating point registers for integer operations which it has a tendency to do. 77# Also explicitly disable Altivec instructions inside the kernel. 78# 79.if ${MACHINE_CPUARCH} == "powerpc" 80CFLAGS+= -msoft-float -mno-altivec 81INLINE_LIMIT?= 15000 82.endif 83 84# 85# Use dot symbols on powerpc64 to make ddb happy 86# 87.if ${MACHINE_ARCH} == "powerpc64" 88CFLAGS+= -mcall-aixdesc 89.endif 90 91# 92# For MIPS we also tell gcc to use floating point emulation 93# 94.if ${MACHINE_CPUARCH} == "mips" 95CFLAGS+= -msoft-float 96INLINE_LIMIT?= 8000 97.endif 98 99# 100# GCC 3.0 and above like to do certain optimizations based on the 101# assumption that the program is linked against libc. Stop this. 102# 103.if ${CC:T:Micc} == "icc" 104CFLAGS+= -nolib_inline 105.else 106CFLAGS+= -ffreestanding 107.endif 108 109.if ${CC:T:Micc} == "icc" 110CFLAGS+= -restrict 111.endif 112 113# 114# GCC SSP support. 115# 116.if ${MK_SSP} != "no" && ${CC:T:Micc} != "icc" && \ 117 ${MACHINE_CPUARCH} != "ia64" && ${MACHINE_CPUARCH} != "arm" && \ 118 ${MACHINE_CPUARCH} != "mips" 119CFLAGS+= -fstack-protector 120.endif 121 122# 123# Enable CTF conversation on request. 124# 125.if defined(WITH_CTF) 126.undef NO_CTF 127.endif 128 129