90ce288afe
-mcmodel=large, for now. While here, disable -msoft-float for clang since it is not supported, and add -fno-dwarf2-cfi-asm to stop it from emitting .cfi directives, which GNU as does not support.
165 lines
5.2 KiB
Makefile
165 lines
5.2 KiB
Makefile
# $FreeBSD$
|
|
|
|
# Compat
|
|
MK_FORMAT_EXTENSIONS?=no
|
|
|
|
#
|
|
# Warning flags for compiling the kernel and components of the kernel:
|
|
#
|
|
CWARNFLAGS?= -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes \
|
|
-Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual \
|
|
-Wundef -Wno-pointer-sign ${FORMAT_EXTENSIONS} \
|
|
-Wmissing-include-dirs -fdiagnostics-show-option \
|
|
${CWARNEXTRA}
|
|
#
|
|
# The following flags are next up for working on:
|
|
# -Wextra
|
|
|
|
# Disable a few warnings for clang, since there are several places in the
|
|
# kernel where fixing them is more trouble than it is worth, or where there is
|
|
# a false positive.
|
|
.if ${COMPILER_TYPE} == "clang"
|
|
NO_WCONSTANT_CONVERSION= -Wno-constant-conversion
|
|
NO_WARRAY_BOUNDS= -Wno-array-bounds
|
|
NO_WSHIFT_COUNT_NEGATIVE= -Wno-shift-count-negative
|
|
NO_WSHIFT_COUNT_OVERFLOW= -Wno-shift-count-overflow
|
|
NO_WUNUSED_VALUE= -Wno-unused-value
|
|
NO_WSELF_ASSIGN= -Wno-self-assign
|
|
NO_WFORMAT_SECURITY= -Wno-format-security
|
|
NO_WUNNEEDED_INTERNAL_DECL= -Wno-unneeded-internal-declaration
|
|
NO_WSOMETIMES_UNINITIALIZED= -Wno-error-sometimes-uninitialized
|
|
# Several other warnings which might be useful in some cases, but not severe
|
|
# enough to error out the whole kernel build. Display them anyway, so there is
|
|
# some incentive to fix them eventually.
|
|
CWARNEXTRA?= -Wno-error-tautological-compare -Wno-error-empty-body \
|
|
-Wno-error-parentheses-equality -Wno-unused-function \
|
|
${NO_WFORMAT}
|
|
.endif
|
|
|
|
# External compilers may not support our format extensions. Allow them
|
|
# to be disabled. WARNING: format checking is disabled in this case.
|
|
.if ${MK_FORMAT_EXTENSIONS} == "no"
|
|
NO_WFORMAT= -Wno-format
|
|
.else
|
|
FORMAT_EXTENSIONS= -fformat-extensions
|
|
.endif
|
|
|
|
#
|
|
# On i386, do not align the stack to 16-byte boundaries. Otherwise GCC 2.95
|
|
# and above adds code to the entry and exit point of every function to align the
|
|
# stack to 16-byte boundaries -- thus wasting approximately 12 bytes of stack
|
|
# per function call. While the 16-byte alignment may benefit micro benchmarks,
|
|
# it is probably an overall loss as it makes the code bigger (less efficient
|
|
# use of code cache tag lines) and uses more stack (less efficient use of data
|
|
# cache tag lines). Explicitly prohibit the use of FPU, SSE and other SIMD
|
|
# operations inside the kernel itself. These operations are exclusively
|
|
# reserved for user applications.
|
|
#
|
|
# gcc:
|
|
# Setting -mno-mmx implies -mno-3dnow
|
|
# Setting -mno-sse implies -mno-sse2, -mno-sse3 and -mno-ssse3
|
|
#
|
|
# clang:
|
|
# Setting -mno-mmx implies -mno-3dnow and -mno-3dnowa
|
|
# Setting -mno-sse implies -mno-sse2, -mno-sse3, -mno-ssse3, -mno-sse41 and -mno-sse42
|
|
#
|
|
.if ${MACHINE_CPUARCH} == "i386"
|
|
.if ${COMPILER_TYPE} != "clang"
|
|
CFLAGS+= -mno-align-long-strings -mpreferred-stack-boundary=2
|
|
.else
|
|
CFLAGS+= -mno-aes -mno-avx
|
|
.endif
|
|
CFLAGS+= -mno-mmx -mno-sse -msoft-float
|
|
INLINE_LIMIT?= 8000
|
|
.endif
|
|
|
|
.if ${MACHINE_CPUARCH} == "arm"
|
|
INLINE_LIMIT?= 8000
|
|
.endif
|
|
|
|
#
|
|
# For IA-64, we use r13 for the kernel globals pointer and we only use
|
|
# a very small subset of float registers for integer divides.
|
|
#
|
|
.if ${MACHINE_CPUARCH} == "ia64"
|
|
CFLAGS+= -ffixed-r13 -mfixed-range=f32-f127 -fpic #-mno-sdata
|
|
INLINE_LIMIT?= 15000
|
|
.endif
|
|
|
|
#
|
|
# For sparc64 we want the medany code model so modules may be located
|
|
# anywhere in the 64-bit address space. We also tell GCC to use floating
|
|
# point emulation. This avoids using floating point registers for integer
|
|
# operations which it has a tendency to do.
|
|
#
|
|
.if ${MACHINE_CPUARCH} == "sparc64"
|
|
.if ${COMPILER_TYPE} == "clang"
|
|
CFLAGS+= -mcmodel=large -fno-dwarf2-cfi-asm
|
|
.else
|
|
CFLAGS+= -mcmodel=medany -msoft-float
|
|
.endif
|
|
INLINE_LIMIT?= 15000
|
|
.endif
|
|
|
|
#
|
|
# For AMD64, we explicitly prohibit the use of FPU, SSE and other SIMD
|
|
# operations inside the kernel itself. These operations are exclusively
|
|
# reserved for user applications.
|
|
#
|
|
# gcc:
|
|
# Setting -mno-mmx implies -mno-3dnow
|
|
# Setting -mno-sse implies -mno-sse2, -mno-sse3, -mno-ssse3 and -mfpmath=387
|
|
#
|
|
# clang:
|
|
# Setting -mno-mmx implies -mno-3dnow and -mno-3dnowa
|
|
# Setting -mno-sse implies -mno-sse2, -mno-sse3, -mno-ssse3, -mno-sse41 and -mno-sse42
|
|
# (-mfpmath= is not supported)
|
|
#
|
|
.if ${MACHINE_CPUARCH} == "amd64"
|
|
.if ${COMPILER_TYPE} == "clang"
|
|
CFLAGS+= -mno-aes -mno-avx
|
|
.endif
|
|
CFLAGS+= -mcmodel=kernel -mno-red-zone -mno-mmx -mno-sse -msoft-float \
|
|
-fno-asynchronous-unwind-tables
|
|
INLINE_LIMIT?= 8000
|
|
.endif
|
|
|
|
#
|
|
# For PowerPC we tell gcc to use floating point emulation. This avoids using
|
|
# floating point registers for integer operations which it has a tendency to do.
|
|
# Also explicitly disable Altivec instructions inside the kernel.
|
|
#
|
|
.if ${MACHINE_CPUARCH} == "powerpc"
|
|
CFLAGS+= -msoft-float -mno-altivec
|
|
INLINE_LIMIT?= 15000
|
|
.endif
|
|
|
|
#
|
|
# Use dot symbols on powerpc64 to make ddb happy
|
|
#
|
|
.if ${MACHINE_ARCH} == "powerpc64"
|
|
CFLAGS+= -mcall-aixdesc
|
|
.endif
|
|
|
|
#
|
|
# For MIPS we also tell gcc to use floating point emulation
|
|
#
|
|
.if ${MACHINE_CPUARCH} == "mips"
|
|
CFLAGS+= -msoft-float
|
|
INLINE_LIMIT?= 8000
|
|
.endif
|
|
|
|
#
|
|
# GCC 3.0 and above like to do certain optimizations based on the
|
|
# assumption that the program is linked against libc. Stop this.
|
|
#
|
|
CFLAGS+= -ffreestanding
|
|
|
|
#
|
|
# GCC SSP support
|
|
#
|
|
.if ${MK_SSP} != "no" && ${MACHINE_CPUARCH} != "ia64" && \
|
|
${MACHINE_CPUARCH} != "arm" && ${MACHINE_CPUARCH} != "mips"
|
|
CFLAGS+= -fstack-protector
|
|
.endif
|