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arch: introduce BR2_GCC_TARGET_{FPU, FLOAT_ABI}

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Buildroot already has the BR2_GCC_TARGET_{TUNE,ARCH,ABI,CPU} hidden
kconfig strings that allow per-architecture Config.in files to feed
the appropriate values of --with-{tune,arch,abi-cpu} when building
gcc, or the appropriate flags for the external toolchain wrapper.

This commit has two additional options:
BR2_GCC_TARGET_{FPU,FLOAT_ABI}, that allows to define the
--with-{fpu,float} gcc configure options for the internal backend, or
the -m{fpu,float-abi} options for the flags of the external toolchain
wrapper.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
This commit is contained in:
Thomas Petazzoni 2013-07-16 10:03:12 +02:00 committed by Peter Korsgaard
parent 3c71b90ce3
commit d774551787
4 changed files with 38 additions and 0 deletions
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12
arch/Config.in
View File

@ -192,6 +192,18 @@ config BR2_GCC_TARGET_CPU
config BR2_GCC_TARGET_CPU_REVISION
string
# The value of this option will be passed as --with-fpu=<value> when
# building gcc (internal backend) or -mfpu=<value> in the toolchain
# wrapper (external toolchain)
config BR2_GCC_TARGET_FPU
string
# The value of this option will be passed as --with-float=<value> when
# building gcc (internal backend) or -mfloat-abi=<value> in the toolchain
# wrapper (external toolchain)
config BR2_GCC_TARGET_FLOAT_ABI
string
# Set up target binary format
choice
prompt "Target Binary Format"

10
package/gcc/gcc.mk
View File

@ -167,6 +167,16 @@ HOST_GCC_COMMON_CONF_OPT += --with-cpu=$(call qstrip,$(BR2_GCC_TARGET_CPU))
endif
endif
GCC_TARGET_FPU = $(call qstrip,$(BR2_GCC_TARGET_FPU))
ifneq ($(GCC_TARGET_FPU),)
HOST_GCC_COMMON_CONF_OPT += --with-fpu=$(GCC_TARGET_FPU)
endif
GCC_TARGET_FLOAT_ABI = $(call qstrip,$(BR2_GCC_TARGET_FLOAT_ABI))
ifneq ($(GCC_TARGET_FLOAT_ABI),)
HOST_GCC_COMMON_CONF_OPT += --with-float=$(GCC_TARGET_FLOAT_ABI)
endif
# Branding works on >= 4.3
ifneq ($(findstring x4.2.,x$(GCC_VERSION)),x4.2.)
HOST_GCC_COMMON_CONF_OPT += \

10
toolchain/toolchain-external/ext-tool.mk
View File

@ -145,6 +145,8 @@ CC_TARGET_CPU_:=$(call qstrip,$(BR2_GCC_TARGET_CPU)-$(BR2_GCC_TARGET_CPU_REVISIO
endif
CC_TARGET_ARCH_:=$(call qstrip,$(BR2_GCC_TARGET_ARCH))
CC_TARGET_ABI_:=$(call qstrip,$(BR2_GCC_TARGET_ABI))
CC_TARGET_FPU_:=$(call qstrip,$(BR2_GCC_TARGET_FPU))
CC_TARGET_FLOAT_ABI_:=$(call qstrip,$(BR2_GCC_TARGET_FLOAT_ABI))
# march/mtune/floating point mode needs to be passed to the external toolchain
# to select the right multilib variant
@ -168,6 +170,14 @@ ifneq ($(CC_TARGET_ABI_),)
TOOLCHAIN_EXTERNAL_CFLAGS += -mabi=$(CC_TARGET_ABI_)
TOOLCHAIN_EXTERNAL_WRAPPER_ARGS += -DBR_ABI='"$(CC_TARGET_ABI_)"'
endif
ifneq ($(CC_TARGET_FPU_),)
TOOLCHAIN_EXTERNAL_CFLAGS += -mfpu=$(CC_TARGET_FPU_)
TOOLCHAIN_EXTERNAL_WRAPPER_ARGS += -DBR_FPU='"$(CC_TARGET_FPU_)"'
endif
ifneq ($(CC_TARGET_FLOAT_ABI_),)
TOOLCHAIN_EXTERNAL_CFLAGS += -mfloat-abi=$(CC_TARGET_FLOAT_ABI_)
TOOLCHAIN_EXTERNAL_WRAPPER_ARGS += -DBR_FLOAT_ABI='"$(CC_TARGET_FLOAT_ABI_)"'
endif
ifeq ($(BR2_BINFMT_FLAT),y)
TOOLCHAIN_EXTERNAL_CFLAGS += -Wl,-elf2flt
TOOLCHAIN_EXTERNAL_WRAPPER_ARGS += -DBR_BINFMT_FLAT

6
toolchain/toolchain-external/ext-toolchain-wrapper.c
View File

@ -38,6 +38,12 @@ static char *predef_args[] = {
#ifdef BR_ABI
"-mabi=" BR_ABI,
#endif
#ifdef BR_FLOAT_ABI
"-mfloat-abi=" BR_FLOAT_ABI,
#endif
#ifdef BR2_FPU
"-mfpu=" BR_FPU,
#endif
#ifdef BR_SOFTFLOAT
"-msoft-float",
#endif /* BR_SOFTFLOAT */