230 lines
7.7 KiB
Makefile
230 lines
7.7 KiB
Makefile
# $FreeBSD$
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#
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# Warning flags for compiling the kernel and components of the kernel:
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#
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CWARNFLAGS?= -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes \
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-Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual \
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-Wundef -Wno-pointer-sign ${FORMAT_EXTENSIONS} \
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-Wmissing-include-dirs -fdiagnostics-show-option \
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-Wno-unknown-pragmas \
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${CWARNEXTRA}
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#
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# The following flags are next up for working on:
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# -Wextra
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# Disable a few warnings for clang, since there are several places in the
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# kernel where fixing them is more trouble than it is worth, or where there is
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# a false positive.
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.if ${COMPILER_TYPE} == "clang"
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NO_WCONSTANT_CONVERSION= -Wno-constant-conversion
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NO_WSHIFT_COUNT_NEGATIVE= -Wno-shift-count-negative
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NO_WSHIFT_COUNT_OVERFLOW= -Wno-shift-count-overflow
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NO_WSELF_ASSIGN= -Wno-self-assign
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NO_WUNNEEDED_INTERNAL_DECL= -Wno-unneeded-internal-declaration
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NO_WSOMETIMES_UNINITIALIZED= -Wno-error-sometimes-uninitialized
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NO_WCAST_QUAL= -Wno-cast-qual
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# Several other warnings which might be useful in some cases, but not severe
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# enough to error out the whole kernel build. Display them anyway, so there is
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# some incentive to fix them eventually.
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CWARNEXTRA?= -Wno-error-tautological-compare -Wno-error-empty-body \
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-Wno-error-parentheses-equality -Wno-error-unused-function \
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-Wno-error-pointer-sign
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.if ${COMPILER_VERSION} >= 30700
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CWARNEXTRA+= -Wno-error-shift-negative-value
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.endif
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CLANG_NO_IAS= -no-integrated-as
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.if ${COMPILER_VERSION} < 30500
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# XXX: clang < 3.5 integrated-as doesn't grok .codeNN directives
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CLANG_NO_IAS34= -no-integrated-as
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.endif
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.endif
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.if ${COMPILER_TYPE} == "gcc"
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.if ${COMPILER_VERSION} >= 40300
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# Catch-all for all the things that are in our tree, but for which we're
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# not yet ready for this compiler. Note: we likely only really "support"
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# building with gcc 4.8 and newer. Nothing older has been tested.
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CWARNEXTRA?= -Wno-error=inline -Wno-error=enum-compare -Wno-error=unused-but-set-variable \
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-Wno-error=aggressive-loop-optimizations -Wno-error=maybe-uninitialized \
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-Wno-error=array-bounds -Wno-error=address \
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-Wno-error=cast-qual -Wno-error=sequence-point -Wno-error=attributes \
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-Wno-error=strict-overflow -Wno-error=overflow
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.else
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# For gcc 4.2, eliminate the too-often-wrong warnings about uninitialized vars.
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CWARNEXTRA?= -Wno-uninitialized
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.endif
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.endif
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# External compilers may not support our format extensions. Allow them
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# to be disabled. WARNING: format checking is disabled in this case.
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.if ${MK_FORMAT_EXTENSIONS} == "no"
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FORMAT_EXTENSIONS= -Wno-format
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.elif ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 30600
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FORMAT_EXTENSIONS= -D__printf__=__freebsd_kprintf__
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.else
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FORMAT_EXTENSIONS= -fformat-extensions
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.endif
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#
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# On i386, do not align the stack to 16-byte boundaries. Otherwise GCC 2.95
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# and above adds code to the entry and exit point of every function to align the
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# stack to 16-byte boundaries -- thus wasting approximately 12 bytes of stack
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# per function call. While the 16-byte alignment may benefit micro benchmarks,
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# it is probably an overall loss as it makes the code bigger (less efficient
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# use of code cache tag lines) and uses more stack (less efficient use of data
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# cache tag lines). Explicitly prohibit the use of FPU, SSE and other SIMD
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# operations inside the kernel itself. These operations are exclusively
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# reserved for user applications.
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#
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# gcc:
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# Setting -mno-mmx implies -mno-3dnow
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# Setting -mno-sse implies -mno-sse2, -mno-sse3 and -mno-ssse3
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#
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# clang:
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# Setting -mno-mmx implies -mno-3dnow and -mno-3dnowa
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# Setting -mno-sse implies -mno-sse2, -mno-sse3, -mno-ssse3, -mno-sse41 and -mno-sse42
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#
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.if ${MACHINE_CPUARCH} == "i386"
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CFLAGS.gcc+= -mno-align-long-strings -mpreferred-stack-boundary=2
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CFLAGS.clang+= -mno-aes -mno-avx
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CFLAGS+= -mno-mmx -mno-sse -msoft-float
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INLINE_LIMIT?= 8000
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.endif
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.if ${MACHINE_CPUARCH} == "arm"
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INLINE_LIMIT?= 8000
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.endif
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.if ${MACHINE_CPUARCH} == "aarch64"
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# We generally don't want fpu instructions in the kernel.
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CFLAGS += -mgeneral-regs-only
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# Reserve x18 for pcpu data
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CFLAGS += -ffixed-x18
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.endif
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#
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# For sparc64 we want the medany code model so modules may be located
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# anywhere in the 64-bit address space. We also tell GCC to use floating
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# point emulation. This avoids using floating point registers for integer
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# operations which it has a tendency to do.
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#
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.if ${MACHINE_CPUARCH} == "sparc64"
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CFLAGS.clang+= -mcmodel=large -fno-dwarf2-cfi-asm
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CFLAGS.gcc+= -mcmodel=medany -msoft-float
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INLINE_LIMIT?= 15000
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.endif
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#
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# For AMD64, we explicitly prohibit the use of FPU, SSE and other SIMD
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# operations inside the kernel itself. These operations are exclusively
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# reserved for user applications.
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#
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# gcc:
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# Setting -mno-mmx implies -mno-3dnow
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# Setting -mno-sse implies -mno-sse2, -mno-sse3, -mno-ssse3 and -mfpmath=387
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#
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# clang:
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# Setting -mno-mmx implies -mno-3dnow and -mno-3dnowa
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# Setting -mno-sse implies -mno-sse2, -mno-sse3, -mno-ssse3, -mno-sse41 and -mno-sse42
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# (-mfpmath= is not supported)
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#
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.if ${MACHINE_CPUARCH} == "amd64"
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CFLAGS.clang+= -mno-aes -mno-avx
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CFLAGS+= -mcmodel=kernel -mno-red-zone -mno-mmx -mno-sse -msoft-float \
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-fno-asynchronous-unwind-tables
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INLINE_LIMIT?= 8000
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.endif
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#
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# For PowerPC we tell gcc to use floating point emulation. This avoids using
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# floating point registers for integer operations which it has a tendency to do.
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# Also explicitly disable Altivec instructions inside the kernel.
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#
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.if ${MACHINE_CPUARCH} == "powerpc"
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CFLAGS+= -mno-altivec
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CFLAGS.clang+= -mllvm -disable-ppc-float-in-variadic=true
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CFLAGS.gcc+= -msoft-float
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INLINE_LIMIT?= 15000
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.endif
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#
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# Use dot symbols on powerpc64 to make ddb happy
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#
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.if ${MACHINE_ARCH} == "powerpc64"
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CFLAGS.gcc+= -mcall-aixdesc
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.endif
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#
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# For MIPS we also tell gcc to use floating point emulation
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#
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.if ${MACHINE_CPUARCH} == "mips"
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CFLAGS+= -msoft-float
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INLINE_LIMIT?= 8000
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.endif
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#
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# GCC 3.0 and above like to do certain optimizations based on the
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# assumption that the program is linked against libc. Stop this.
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#
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CFLAGS+= -ffreestanding
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#
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# The C standard leaves signed integer overflow behavior undefined.
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# gcc and clang opimizers take advantage of this. The kernel makes
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# use of signed integer wraparound mechanics so we need the compiler
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# to treat it as a wraparound and not take shortcuts.
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#
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CFLAGS+= -fwrapv
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#
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# GCC SSP support
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#
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.if ${MK_SSP} != "no" && \
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${MACHINE_CPUARCH} != "arm" && ${MACHINE_CPUARCH} != "mips"
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CFLAGS+= -fstack-protector
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.endif
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#
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# Add -gdwarf-2 when compiling -g. The default starting in clang v3.4
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# and gcc 4.8 is to generate DWARF version 4. However, our tools don't
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# cope well with DWARF 4, so force it to genereate DWARF2, which they
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# understand. Do this unconditionally as it is harmless when not needed,
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# but critical for these newer versions.
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#
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.if ${CFLAGS:M-g} != "" && ${CFLAGS:M-gdwarf*} == ""
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CFLAGS+= -gdwarf-2
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.endif
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CFLAGS+= ${CWARNFLAGS} ${CWARNFLAGS.${.IMPSRC:T}}
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CFLAGS+= ${CFLAGS.${COMPILER_TYPE}} ${CFLAGS.${.IMPSRC:T}}
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# Tell bmake not to mistake standard targets for things to be searched for
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# or expect to ever be up-to-date.
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PHONY_NOTMAIN = afterdepend afterinstall all beforedepend beforeinstall \
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beforelinking build build-tools buildfiles buildincludes \
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checkdpadd clean cleandepend cleandir cleanobj configure \
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depend dependall distclean distribute exe \
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html includes install installfiles installincludes lint \
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obj objlink objs objwarn realall realdepend \
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realinstall regress subdir-all subdir-depend subdir-install \
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tags whereobj
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.PHONY: ${PHONY_NOTMAIN}
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.NOTMAIN: ${PHONY_NOTMAIN}
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CSTD= c99
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.if ${CSTD} == "k&r"
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CFLAGS+= -traditional
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.elif ${CSTD} == "c89" || ${CSTD} == "c90"
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CFLAGS+= -std=iso9899:1990
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.elif ${CSTD} == "c94" || ${CSTD} == "c95"
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CFLAGS+= -std=iso9899:199409
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.elif ${CSTD} == "c99"
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CFLAGS+= -std=iso9899:1999
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.else # CSTD
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CFLAGS+= -std=${CSTD}
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.endif # CSTD
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