j3d1/esp-open-rtos
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libc: Recompile newlib to enable float & long double i/o in printf/scanf

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Enabled by default, set PRINTF_SCANF_FLOAT_SUPPORT=0 in local.mk/Makefile to disable

newlib-xtensa revision ae10be3

Configure/compile steps:

../configure --with-newlib --enable-multilib
--disable-newlib-io-c99-formats --enable-newlib-supplied-syscalls --enable-target-optspace --program-transform-name="s&^&xtensa-lx106-elf-&" --disable-option-checking --with-target-subdir=xtensa-lx106-elf
--target=xtensa-lx106-elf --prefix=/home/gus/dev/esp/rtos/open-rtos/libc/ --enable-newlib-nano-malloc --enable-newlib-nano-formatted-io --enable-newlib-reent-small --prefix=path_to/esp-open-rtos/libc

CROSS_CFLAGS="-DSIGNAL_PROVIDED -DABORT_PROVIDED" make
make install

Closes #95
This commit is contained in:
Angus Gratton 2016-02-23 09:21:03 +11:00
parent 7c1d7fb43e
commit 19b0a19ad6
5 changed files with 54 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

12
common.mk
View file

@ -48,6 +48,13 @@ ESPTOOL ?= esptool.py
ESPPORT ?= /dev/ttyUSB0
ESPBAUD ?= 115200
# set this to 0 if you don't need floating point support in printf/scanf
# this will save approx 14.5KB flash space and 448 bytes of statically allocated
# data RAM
#
# NB: Setting the value to 0 requires a recent esptool.py (Feb 2016 / commit ebf02c9)
PRINTF_SCANF_FLOAT_SUPPORT ?= 1
# Set OTA to 1 to build an image that supports rBoot OTA bootloader
#
# Currently only works with 16mbit or more flash sizes, with 8mbit
@ -109,7 +116,7 @@ CXXFLAGS ?= $(C_CXX_FLAGS) -fno-exceptions -fno-rtti $(EXTRA_CXXFLAGS)
# these aren't technically preprocesor args, but used by all 3 of C, C++, assembler
CPPFLAGS += -mlongcalls -mtext-section-literals
LDFLAGS = -nostdlib -Wl,--no-check-sections -L$(BUILD_DIR)sdklib -L$(ROOT)lib -u $(ENTRY_SYMBOL) -Wl,-static -Wl,-Map=$(BUILD_DIR)$(PROGRAM).map $(EXTRA_LDFLAGS)
LDFLAGS = -nostdlib -Wl,--no-check-sections -L$(BUILD_DIR)sdklib -L$(ROOT)lib -u $(ENTRY_SYMBOL) -Wl,-static -Wl,-Map=$(BUILD_DIR)$(PROGRAM).map $(EXTRA_LDFLAGS)
ifeq ($(SPLIT_SECTIONS),1)
C_CXX_FLAGS += -ffunction-sections -fdata-sections
@ -202,6 +209,9 @@ INC_DIRS = $(PROGRAM_DIR) $(PROGRAM_DIR)include $(ROOT)include
ifeq ($(OWN_LIBC),1)
INC_DIRS += $(ROOT)libc/xtensa-lx106-elf/include
LDFLAGS += -L$(ROOT)libc/xtensa-lx106-elf/lib
ifeq ($(PRINTF_SCANF_FLOAT_SUPPORT),1)
LDFLAGS += -u _printf_float -u _scanf_float
endif
endif
ifeq ("$(V)","1")