167 lines
5.8 KiB
Makefile
167 lines
5.8 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 \
|
|
${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-error-unused-function
|
|
.endif
|
|
|
|
.if ${COMPILER_TYPE} == "gcc" && ${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=unused-local-typedefs -Wno-error=array-bounds -Wno-error=address \
|
|
-Wno-error=cast-qual -Wno-error=sequence-point -Wno-error=attributes
|
|
.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
|
|
.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
|
|
|
|
#
|
|
# 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+= -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} != "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+= ${CFLAGS.${COMPILER_TYPE}}
|