8598392cd1
- Move the required kernel compiler flags from Makefile.arm64 to kern.mk. - Build arm64 modules as PIC; non-PIC relocations in .o for shared object output cannot be handled. - Do not try to install aarch64 symlink. - A hack for arm64 to avoid ld -r stage. See the comment for the explanation. Some functionality is lost, like ctf handling, but hopefully will be restored after newer linker is available. Reviewed by: andrew, emaste Tested by: andrew (on real hardware) Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D3796
230 lines
7.7 KiB
Makefile
230 lines
7.7 KiB
Makefile
# $FreeBSD$
|
|
|
|
#
|
|
# 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 \
|
|
-Wno-unknown-pragmas \
|
|
${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_WSHIFT_COUNT_NEGATIVE= -Wno-shift-count-negative
|
|
NO_WSHIFT_COUNT_OVERFLOW= -Wno-shift-count-overflow
|
|
NO_WSELF_ASSIGN= -Wno-self-assign
|
|
NO_WUNNEEDED_INTERNAL_DECL= -Wno-unneeded-internal-declaration
|
|
NO_WSOMETIMES_UNINITIALIZED= -Wno-error-sometimes-uninitialized
|
|
NO_WCAST_QUAL= -Wno-cast-qual
|
|
# 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-error-unused-function \
|
|
-Wno-error-pointer-sign
|
|
.if ${COMPILER_VERSION} >= 30700
|
|
CWARNEXTRA+= -Wno-error-shift-negative-value
|
|
.endif
|
|
|
|
CLANG_NO_IAS= -no-integrated-as
|
|
.if ${COMPILER_VERSION} < 30500
|
|
# XXX: clang < 3.5 integrated-as doesn't grok .codeNN directives
|
|
CLANG_NO_IAS34= -no-integrated-as
|
|
.endif
|
|
.endif
|
|
|
|
.if ${COMPILER_TYPE} == "gcc"
|
|
.if ${COMPILER_VERSION} >= 40300
|
|
# Catch-all for all the things that are in our tree, but for which we're
|
|
# not yet ready for this compiler. Note: we likely only really "support"
|
|
# building with gcc 4.8 and newer. Nothing older has been tested.
|
|
CWARNEXTRA?= -Wno-error=inline -Wno-error=enum-compare -Wno-error=unused-but-set-variable \
|
|
-Wno-error=aggressive-loop-optimizations -Wno-error=maybe-uninitialized \
|
|
-Wno-error=array-bounds -Wno-error=address \
|
|
-Wno-error=cast-qual -Wno-error=sequence-point -Wno-error=attributes \
|
|
-Wno-error=strict-overflow -Wno-error=overflow
|
|
.else
|
|
# For gcc 4.2, eliminate the too-often-wrong warnings about uninitialized vars.
|
|
CWARNEXTRA?= -Wno-uninitialized
|
|
.endif
|
|
.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"
|
|
FORMAT_EXTENSIONS= -Wno-format
|
|
.elif ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 30600
|
|
FORMAT_EXTENSIONS= -D__printf__=__freebsd_kprintf__
|
|
.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"
|
|
CFLAGS.gcc+= -mno-align-long-strings -mpreferred-stack-boundary=2
|
|
CFLAGS.clang+= -mno-aes -mno-avx
|
|
CFLAGS+= -mno-mmx -mno-sse -msoft-float
|
|
INLINE_LIMIT?= 8000
|
|
.endif
|
|
|
|
.if ${MACHINE_CPUARCH} == "arm"
|
|
INLINE_LIMIT?= 8000
|
|
.endif
|
|
|
|
.if ${MACHINE_CPUARCH} == "aarch64"
|
|
# We generally don't want fpu instructions in the kernel.
|
|
CFLAGS += -mgeneral-regs-only
|
|
# Reserve x18 for pcpu data
|
|
CFLAGS += -ffixed-x18
|
|
.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"
|
|
CFLAGS.clang+= -mcmodel=large -fno-dwarf2-cfi-asm
|
|
CFLAGS.gcc+= -mcmodel=medany -msoft-float
|
|
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"
|
|
CFLAGS.clang+= -mno-aes -mno-avx
|
|
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+= -mno-altivec
|
|
CFLAGS.clang+= -mllvm -disable-ppc-float-in-variadic=true
|
|
CFLAGS.gcc+= -msoft-float
|
|
INLINE_LIMIT?= 15000
|
|
.endif
|
|
|
|
#
|
|
# Use dot symbols on powerpc64 to make ddb happy
|
|
#
|
|
.if ${MACHINE_ARCH} == "powerpc64"
|
|
CFLAGS.gcc+= -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
|
|
|
|
#
|
|
# The C standard leaves signed integer overflow behavior undefined.
|
|
# gcc and clang opimizers take advantage of this. The kernel makes
|
|
# use of signed integer wraparound mechanics so we need the compiler
|
|
# to treat it as a wraparound and not take shortcuts.
|
|
#
|
|
CFLAGS+= -fwrapv
|
|
|
|
#
|
|
# GCC SSP support
|
|
#
|
|
.if ${MK_SSP} != "no" && \
|
|
${MACHINE_CPUARCH} != "arm" && ${MACHINE_CPUARCH} != "mips"
|
|
CFLAGS+= -fstack-protector
|
|
.endif
|
|
|
|
#
|
|
# Add -gdwarf-2 when compiling -g. The default starting in clang v3.4
|
|
# and gcc 4.8 is to generate DWARF version 4. However, our tools don't
|
|
# cope well with DWARF 4, so force it to genereate DWARF2, which they
|
|
# understand. Do this unconditionally as it is harmless when not needed,
|
|
# but critical for these newer versions.
|
|
#
|
|
.if ${CFLAGS:M-g} != "" && ${CFLAGS:M-gdwarf*} == ""
|
|
CFLAGS+= -gdwarf-2
|
|
.endif
|
|
|
|
CFLAGS+= ${CWARNFLAGS} ${CWARNFLAGS.${.IMPSRC:T}}
|
|
CFLAGS+= ${CFLAGS.${COMPILER_TYPE}} ${CFLAGS.${.IMPSRC:T}}
|
|
|
|
# Tell bmake not to mistake standard targets for things to be searched for
|
|
# or expect to ever be up-to-date.
|
|
PHONY_NOTMAIN = afterdepend afterinstall all beforedepend beforeinstall \
|
|
beforelinking build build-tools buildfiles buildincludes \
|
|
checkdpadd clean cleandepend cleandir cleanobj configure \
|
|
depend dependall distclean distribute exe \
|
|
html includes install installfiles installincludes lint \
|
|
obj objlink objs objwarn realall realdepend \
|
|
realinstall regress subdir-all subdir-depend subdir-install \
|
|
tags whereobj
|
|
|
|
.PHONY: ${PHONY_NOTMAIN}
|
|
.NOTMAIN: ${PHONY_NOTMAIN}
|
|
|
|
CSTD= c99
|
|
|
|
.if ${CSTD} == "k&r"
|
|
CFLAGS+= -traditional
|
|
.elif ${CSTD} == "c89" || ${CSTD} == "c90"
|
|
CFLAGS+= -std=iso9899:1990
|
|
.elif ${CSTD} == "c94" || ${CSTD} == "c95"
|
|
CFLAGS+= -std=iso9899:199409
|
|
.elif ${CSTD} == "c99"
|
|
CFLAGS+= -std=iso9899:1999
|
|
.else # CSTD
|
|
CFLAGS+= -std=${CSTD}
|
|
.endif # CSTD
|