Enable compilation on MIPS with gcc-3.3
PATCH 1/1 Enable compilation on MIPS with gcc-3.3
Hi,
arch/mips/Makefile uses gcc's -mcpu= flag to pass subarchitecture selection choices to gcc. -mcpu= was deprecated in gcc 3.1, and has been removed as of gcc 3.3. We need to use -march= for gcc 3.x (where x >= 3), but some versions of gcc don't understand -march= (namely 2.95.x, which some people still use.)
This patch introduces a variable in arch/mips/makefile, gcc-tune-flag, which is "cpu" if gcc understands -mcpu and "arch" if it doesn't, and uses it to build the -mcpu=/-march= bits in CFLAGS for each processor type.
Matt
arch/mips/Makefile renamed from arch/mips/Makefile~mips-arch +16 -14
@@ -38,6 +38,8 @@ ifdef CONFIG_CROSSCOMPILE CROSS_COMPILE := $(tool-prefix) endif +gcc-tune-flag = $(shell if $(CC) -dumpspecs | grep mcpu; then echo cpu; else echo arch; fi) + # # GCC uses -G 0 -mabicalls -fpic as default. We don't want PIC in the kernel # code since it only slows down the whole thing. At some point we might make
@@ -75,49 +77,49 @@ check_warning = $(shell if $(CC) $(1) -c # A kernel built those options will only work on hardware which # actually supports this ISA. # -cflags-$(CONFIG_CPU_R3000) += -mcpu=r3000 +cflags-$(CONFIG_CPU_R3000) += -$(gcc-tune-flag)=r3000 32bit-isa-$(CONFIG_CPU_R3000) += -mips1 64bit-isa-$(CONFIG_CPU_R3000) += -mboom -cflags-$(CONFIG_CPU_TX39XX) += -mcpu=r3000 +cflags-$(CONFIG_CPU_TX39XX) += -$(gcc-tune-flag)=r3000 32bit-isa-$(CONFIG_CPU_TX39XX) += -mips1 64bit-isa-$(CONFIG_CPU_TX39XX) += -mboom -cflags-$(CONFIG_CPU_R6000) += -mcpu=r6000 +cflags-$(CONFIG_CPU_R6000) += -$(gcc-tune-flag)=r6000 32bit-isa-$(CONFIG_CPU_R6000) += -mips2 -Wa,--trap 64bit-isa-$(CONFIG_CPU_R6000) += -mboom -Wa,--trap -cflags-$(CONFIG_CPU_R4300) += -mcpu=r4300 +cflags-$(CONFIG_CPU_R4300) += -$(gcc-tune-flag)=r4300 32bit-isa-$(CONFIG_CPU_R4300) += -mips2 -Wa,--trap 64bit-isa-$(CONFIG_CPU_R4300) += -mips3 -Wa,--trap -cflags-$(CONFIG_CPU_VR41XX) += -mcpu=r4600 +cflags-$(CONFIG_CPU_VR41XX) += -$(gcc-tune-flag)=r4600 32bit-isa-$(CONFIG_CPU_VR41XX) += -mips2 -Wa,--trap 64bit-isa-$(CONFIG_CPU_VR41XX) += -mips3 -Wa,--trap -cflags-$(CONFIG_CPU_R4X00) += -mcpu=r4600 +cflags-$(CONFIG_CPU_R4X00) += -$(gcc-tune-flag)=r4600 32bit-isa-$(CONFIG_CPU_R4X00) += -mips2 -Wa,--trap 64bit-isa-$(CONFIG_CPU_R4X00) += -mips3 -Wa,--trap -cflags-$(CONFIG_CPU_MIPS32) += $(call check_gcc, -mtune=mips32, -mcpu=r4600) +cflags-$(CONFIG_CPU_MIPS32) += $(call check_gcc, -mtune=mips32, -$(gcc-tune-flag)=r4600) 32bit-isa-$(CONFIG_CPU_MIPS32) += $(call check_gcc, -mips32 -mabi=32, -mips2) -Wa,--trap 64bit-isa-$(CONFIG_CPU_MIPS32) += -mboom cflags-$(CONFIG_CPU_MIPS64) += 32bit-isa-$(CONFIG_CPU_MIPS64) += $(call check_gcc, -mips32, -mips2) -Wa,--trap 64bit-isa-$(CONFIG_CPU_MIPS64) += $(call check_gcc, -mips64, -mips4) -Wa,--trap -cflags-$(CONFIG_CPU_R5000) += -mcpu=r8000 +cflags-$(CONFIG_CPU_R5000) += -$(gcc-tune-flag)=r8000 32bit-isa-$(CONFIG_CPU_R5000) += -mips2 -Wa,--trap 64bit-isa-$(CONFIG_CPU_R5000) += -mips4 -Wa,--trap -cflags-$(CONFIG_CPU_R5432) += -mcpu=r5000 +cflags-$(CONFIG_CPU_R5432) += -$(gcc-tune-flag)=r5000 32bit-isa-$(CONFIG_CPU_R5432) += -mips1 -Wa,--trap 64bit-isa-$(CONFIG_CPU_R5432) += -mips3 -Wa,--trap -cflags-$(CONFIG_CPU_NEVADA) += -mcpu=r8000 -mmad +cflags-$(CONFIG_CPU_NEVADA) += -$(gcc-tune-flag)=r8000 -mmad 32bit-isa-$(CONFIG_CPU_NEVADA) += -mips2 -Wa,--trap 64bit-isa-$(CONFIG_CPU_NEVADA) += -mips3 -Wa,--trap -cflags-$(CONFIG_CPU_RM7000) += $(call check_gcc, -mcpu=r7000, -mcpu=r5000) +cflags-$(CONFIG_CPU_RM7000) += $(call check_gcc, -$(gcc-tune-flag)=r7000, -$(gcc-tune-flag)=r5000) 32bit-isa-$(CONFIG_CPU_RM7000) += -mips2 -Wa,--trap 64bit-isa-$(CONFIG_CPU_RM7000) += -mips4 -Wa,--trap -cflags-$(CONFIG_CPU_SB1) += $(call check_gcc, -mcpu=sb1, -mcpu=r8000) +cflags-$(CONFIG_CPU_SB1) += $(call check_gcc, -$(gcc-tune-flag)=sb1, -$(gcc-tune-flag)=r8000) 32bit-isa-$(CONFIG_CPU_SB1) += $(call check_gcc, -mips32, -mips2) -Wa,--trap 64bit-isa-$(CONFIG_CPU_SB1) += $(call check_gcc, -mips64, -mips4) -Wa,--trap -cflags-$(CONFIG_CPU_R8000) += -mcpu=r8000 +cflags-$(CONFIG_CPU_R8000) += -$(gcc-tune-flag)=r8000 32bit-isa-$(CONFIG_CPU_R8000) += -mips2 -Wa,--trap 64bit-isa-$(CONFIG_CPU_R8000) += -mips4 -Wa,--trap -cflags-$(CONFIG_CPU_R10000) += -mcpu=r8000 +cflags-$(CONFIG_CPU_R10000) += -$(gcc-tune-flag)=r8000 32bit-isa-$(CONFIG_CPU_R10000) += -mips2 -Wa,--trap 64bit-isa-$(CONFIG_CPU_R10000) += -mips4 -Wa,--trap
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