1e54857bd9
After the removal of obsolete GDB 6.1.1 from the base system in
1c0ea326aa we no longer need to downgrade to DWARF2 debug info.
We will need to ensure that our tools (e.g. ctfconvert) handle DWARF5
prior to it becoming the default in the Clang and GCC versions we use.
Reported by: jhb
Relnotes: Yes
Sponsored by: The FreeBSD Foundation
321 lines
11 KiB
Makefile
321 lines
11 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 -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-error-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-error-unneeded-internal-declaration
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NO_WSOMETIMES_UNINITIALIZED= -Wno-error-sometimes-uninitialized
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NO_WCAST_QUAL= -Wno-error-cast-qual
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NO_WTAUTOLOGICAL_POINTER_COMPARE= -Wno-tautological-pointer-compare
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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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CWARNEXTRA+= -Wno-error-shift-negative-value
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CWARNEXTRA+= -Wno-address-of-packed-member
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.if ${COMPILER_VERSION} >= 100000
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NO_WMISLEADING_INDENTATION= -Wno-misleading-indentation
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.endif
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.endif # clang
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.if ${COMPILER_TYPE} == "gcc"
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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.
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NO_WUNUSED_BUT_SET_VARIABLE = -Wno-unused-but-set-variable
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CWARNEXTRA?= -Wno-error=address \
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-Wno-error=aggressive-loop-optimizations \
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-Wno-error=array-bounds \
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-Wno-error=attributes \
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-Wno-error=cast-qual \
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-Wno-error=enum-compare \
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-Wno-error=inline \
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-Wno-error=maybe-uninitialized \
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-Wno-error=misleading-indentation \
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-Wno-error=nonnull-compare \
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-Wno-error=overflow \
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-Wno-error=sequence-point \
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-Wno-error=shift-overflow \
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-Wno-error=tautological-compare \
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-Wno-unused-but-set-variable
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.if ${COMPILER_VERSION} >= 70100
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CWARNEXTRA+= -Wno-error=stringop-overflow
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.endif
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.if ${COMPILER_VERSION} >= 70200
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CWARNEXTRA+= -Wno-error=memset-elt-size
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.endif
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.if ${COMPILER_VERSION} >= 80000
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CWARNEXTRA+= -Wno-error=packed-not-aligned
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.endif
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.if ${COMPILER_VERSION} >= 90100
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CWARNEXTRA+= -Wno-address-of-packed-member
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.endif
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.endif # gcc
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# This warning is utter nonsense
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CWARNFLAGS+= -Wno-format-zero-length
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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"
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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+= -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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INLINE_LIMIT?= 8000
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.endif
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#
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# For RISC-V we specify the soft-float ABI (lp64) to avoid the use of floating
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# point registers within the kernel. However, for kernels supporting hardware
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# float (FPE), we have to include that in the march so we can have limited
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# floating point support in context switching needed for that. This is different
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# than userland where we use a hard-float ABI (lp64d).
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#
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# We also specify the "medium" code model, which generates code suitable for a
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# 2GiB addressing range located at any offset, allowing modules to be located
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# anywhere in the 64-bit address space. Note that clang and GCC refer to this
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# code model as "medium" and "medany" respectively.
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#
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.if ${MACHINE_CPUARCH} == "riscv"
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CFLAGS+= -march=rv64imafdc
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CFLAGS+= -mabi=lp64
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CFLAGS.clang+= -mcmodel=medium
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CFLAGS.gcc+= -mcmodel=medany
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INLINE_LIMIT?= 8000
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.if ${LINKER_FEATURES:Mriscv-relaxations} == ""
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CFLAGS+= -mno-relax
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.endif
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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 -msoft-float
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INLINE_LIMIT?= 15000
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.endif
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.if ${MACHINE_ARCH} == "powerpcspe"
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CFLAGS.gcc+= -mno-spe
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.endif
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#
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# Use dot symbols (or, better, the V2 ELF ABI) on powerpc64 to make
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# DDB happy. ELFv2, if available, has some other efficiency benefits.
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#
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.if ${MACHINE_ARCH:Mpowerpc64*} != ""
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CFLAGS+= -mabi=elfv2
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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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# Retpoline speculative execution vulnerability mitigation (CVE-2017-5715)
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#
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.if defined(COMPILER_FEATURES) && ${COMPILER_FEATURES:Mretpoline} != "" && \
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${MK_KERNEL_RETPOLINE} != "no"
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CFLAGS+= -mretpoline
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.endif
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#
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# Initialize stack variables on function entry
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#
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.if ${MK_INIT_ALL_ZERO} == "yes"
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.if ${COMPILER_FEATURES:Minit-all}
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CFLAGS+= -ftrivial-auto-var-init=zero \
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-enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
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.else
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.warning InitAll (zeros) requested but not support by compiler
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.endif
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.elif ${MK_INIT_ALL_PATTERN} == "yes"
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.if ${COMPILER_FEATURES:Minit-all}
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CFLAGS+= -ftrivial-auto-var-init=pattern
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.else
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.warning InitAll (pattern) requested but not support by compiler
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.endif
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.endif
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CFLAGS+= ${CWARNFLAGS:M*} ${CWARNFLAGS.${.IMPSRC:T}}
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CFLAGS+= ${CWARNFLAGS.${COMPILER_TYPE}}
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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 distclean distribute exe \
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html includes install installfiles installincludes \
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obj objlink objs objwarn \
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realinstall regress \
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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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# Please keep this if in sync with bsd.sys.mk
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.if ${LD} != "ld" && (${CC:[1]:H} != ${LD:[1]:H} || ${LD:[1]:T} != "ld")
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# Add -fuse-ld=${LD} if $LD is in a different directory or not called "ld".
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# Note: Clang 12+ will prefer --ld-path= over -fuse-ld=.
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.if ${COMPILER_TYPE} == "clang"
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# Note: unlike bsd.sys.mk we can't use LDFLAGS here since that is used for the
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# flags required when linking the kernel. We don't need those flags when
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# building the vdsos. However, we do need -fuse-ld, so use ${CCLDFLAGS} instead.
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# Note: Clang does not like relative paths in -fuse-ld so we map ld.lld -> lld.
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CCLDFLAGS+= -fuse-ld=${LD:[1]:S/^ld.//1W}
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.else
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# GCC does not support an absolute path for -fuse-ld so we just print this
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# warning instead and let the user add the required symlinks.
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.warning LD (${LD}) is not the default linker for ${CC} but -fuse-ld= is not supported
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.endif
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.endif
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# Set target-specific linker emulation name.
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LD_EMULATION_aarch64=aarch64elf
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LD_EMULATION_amd64=elf_x86_64_fbsd
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LD_EMULATION_arm=armelf_fbsd
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LD_EMULATION_armv6=armelf_fbsd
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LD_EMULATION_armv7=armelf_fbsd
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LD_EMULATION_i386=elf_i386_fbsd
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LD_EMULATION_mips= elf32btsmip_fbsd
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LD_EMULATION_mipshf= elf32btsmip_fbsd
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LD_EMULATION_mips64= elf64btsmip_fbsd
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LD_EMULATION_mips64hf= elf64btsmip_fbsd
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LD_EMULATION_mipsel= elf32ltsmip_fbsd
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LD_EMULATION_mipselhf= elf32ltsmip_fbsd
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LD_EMULATION_mips64el= elf64ltsmip_fbsd
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LD_EMULATION_mips64elhf= elf64ltsmip_fbsd
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LD_EMULATION_mipsn32= elf32btsmipn32_fbsd
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LD_EMULATION_mipsn32el= elf32btsmipn32_fbsd # I don't think this is a thing that works
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LD_EMULATION_powerpc= elf32ppc_fbsd
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LD_EMULATION_powerpcspe= elf32ppc_fbsd
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LD_EMULATION_powerpc64= elf64ppc_fbsd
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LD_EMULATION_powerpc64le= elf64lppc_fbsd
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LD_EMULATION_riscv64= elf64lriscv
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LD_EMULATION_riscv64sf= elf64lriscv
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LD_EMULATION=${LD_EMULATION_${MACHINE_ARCH}}
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