1# $FreeBSD$ 2 3# 4# Warning flags for compiling the kernel and components of the kernel: 5# 6CWARNFLAGS?= -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes \ 7 -Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual \ 8 -Wundef -Wno-pointer-sign -fformat-extensions \ 9 -Wmissing-include-dirs -fdiagnostics-show-option 10# 11# The following flags are next up for working on: 12# -Wextra 13 14# 15# On i386, do not align the stack to 16-byte boundaries. Otherwise GCC 2.95 16# and above adds code to the entry and exit point of every function to align the 17# stack to 16-byte boundaries -- thus wasting approximately 12 bytes of stack 18# per function call. While the 16-byte alignment may benefit micro benchmarks, 19# it is probably an overall loss as it makes the code bigger (less efficient 20# use of code cache tag lines) and uses more stack (less efficient use of data 21# cache tag lines). Explicitly prohibit the use of FPU, SSE and other SIMD 22# operations inside the kernel itself. These operations are exclusively 23# reserved for user applications. 24# 25# gcc: 26# Setting -mno-mmx implies -mno-3dnow 27# Setting -mno-sse implies -mno-sse2, -mno-sse3 and -mno-ssse3 28# 29# clang: 30# Setting -mno-mmx implies -mno-3dnow, -mno-3dnowa, -mno-sse, -mno-sse2, 31# -mno-sse3, -mno-ssse3, -mno-sse41 and -mno-sse42 32# 33.if ${MACHINE_CPUARCH} == "i386" 34.if ${CC:T:Mclang} != "clang" 35CFLAGS+= -mno-align-long-strings -mpreferred-stack-boundary=2 -mno-sse 36.else 37CFLAGS+= -mno-aes -mno-avx 38.endif 39CFLAGS+= -mno-mmx -msoft-float 40INLINE_LIMIT?= 8000 41.endif 42 43.if ${MACHINE_CPUARCH} == "arm" 44INLINE_LIMIT?= 8000 45.endif 46 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_CPUARCH} == "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_CPUARCH} == "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# gcc: 72# Setting -mno-mmx implies -mno-3dnow 73# Setting -mno-sse implies -mno-sse2, -mno-sse3, -mno-ssse3 and -mfpmath=387 74# 75# clang: 76# Setting -mno-mmx implies -mno-3dnow, -mno-3dnowa, -mno-sse, -mno-sse2, 77# -mno-sse3, -mno-ssse3, -mno-sse41 and -mno-sse42 78# (-mfpmath= is not supported) 79# 80.if ${MACHINE_CPUARCH} == "amd64" 81.if ${CC:T:Mclang} != "clang" 82CFLAGS+= -mno-sse 83.else 84CFLAGS+= -mno-aes -mno-avx 85.endif 86CFLAGS+= -mcmodel=kernel -mno-red-zone -mno-mmx -msoft-float \ 87 -fno-asynchronous-unwind-tables 88INLINE_LIMIT?= 8000 89.endif 90 91# 92# For PowerPC we tell gcc to use floating point emulation. This avoids using 93# floating point registers for integer operations which it has a tendency to do. 94# Also explicitly disable Altivec instructions inside the kernel. 95# 96.if ${MACHINE_CPUARCH} == "powerpc" 97CFLAGS+= -msoft-float -mno-altivec 98INLINE_LIMIT?= 15000 99.endif 100 101# 102# Use dot symbols on powerpc64 to make ddb happy 103# 104.if ${MACHINE_ARCH} == "powerpc64" 105CFLAGS+= -mcall-aixdesc 106.endif 107 108# 109# For MIPS we also tell gcc to use floating point emulation 110# 111.if ${MACHINE_CPUARCH} == "mips" 112CFLAGS+= -msoft-float 113INLINE_LIMIT?= 8000 114.endif 115 116# 117# GCC 3.0 and above like to do certain optimizations based on the 118# assumption that the program is linked against libc. Stop this. 119# 120CFLAGS+= -ffreestanding 121 122# 123# GCC SSP support 124# 125.if ${MK_SSP} != "no" && ${MACHINE_CPUARCH} != "ia64" && \ 126 ${MACHINE_CPUARCH} != "arm" && ${MACHINE_CPUARCH} != "mips" 127CFLAGS+= -fstack-protector 128.endif 129 130# 131# Enable CTF conversation on request 132# 133.if defined(WITH_CTF) 134.undef NO_CTF 135.endif 136