# $FreeBSD$ .if ${CC:T:Mclang} != "clang" FREEBSD_GCC!= ${CC} --version | grep FreeBSD || true .endif # # Warning flags for compiling the kernel and components of the kernel: # .if ${FREEBSD_GCC} # FreeBSD extensions, not available in upstream GCC format_extensions= -fformat-extensions no_align_long_strings= -mno-align-long-strings .endif 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 # # The following flags are next up for working on: # -Wextra # # 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, -mno-3dnowa, -mno-sse, -mno-sse2, # -mno-sse3, -mno-ssse3, -mno-sse41 and -mno-sse42 # .if ${MACHINE_CPUARCH} == "i386" .if ${CC:T:Mclang} != "clang" CFLAGS+= ${no_align_long_strings} -mpreferred-stack-boundary=2 -mno-sse .else CFLAGS+= -mno-aes -mno-avx .endif CFLAGS+= -mno-mmx -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 medlow code model, and we 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+= -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, -mno-3dnowa, -mno-sse, -mno-sse2, # -mno-sse3, -mno-ssse3, -mno-sse41 and -mno-sse42 # (-mfpmath= is not supported) # .if ${MACHINE_CPUARCH} == "amd64" .if ${CC:T:Mclang} != "clang" CFLAGS+= -mno-sse .else CFLAGS+= -mno-aes -mno-avx .endif CFLAGS+= -mcmodel=kernel -mno-red-zone -mno-mmx -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 # # Enable CTF conversation on request # .if defined(WITH_CTF) .undef NO_CTF .endif