newlib


understanding the __libc_init_array

你。 提交于 2019-12-29 19:28:38
问题 I viewed the source code of __libc_init_array from http://newlib.sourcearchive.com/documentation/1.18.0/init_8c-source.html . But I don't quite understand what this function does. I know that these symbols /* These magic symbols are provided by the linker. */ extern void (*__preinit_array_start []) (void) __attribute__((weak)); extern void (*__preinit_array_end []) (void) __attribute__((weak)); extern void (*__init_array_start []) (void) __attribute__((weak)); extern void (*__init_array_end [

understanding the __libc_init_array

守給你的承諾、 提交于 2019-12-29 19:26:12
问题 I viewed the source code of __libc_init_array from http://newlib.sourcearchive.com/documentation/1.18.0/init_8c-source.html . But I don't quite understand what this function does. I know that these symbols /* These magic symbols are provided by the linker. */ extern void (*__preinit_array_start []) (void) __attribute__((weak)); extern void (*__preinit_array_end []) (void) __attribute__((weak)); extern void (*__init_array_start []) (void) __attribute__((weak)); extern void (*__init_array_end [

understanding the __libc_init_array

隐身守侯 提交于 2019-12-29 19:24:12
问题 I viewed the source code of __libc_init_array from http://newlib.sourcearchive.com/documentation/1.18.0/init_8c-source.html . But I don't quite understand what this function does. I know that these symbols /* These magic symbols are provided by the linker. */ extern void (*__preinit_array_start []) (void) __attribute__((weak)); extern void (*__preinit_array_end []) (void) __attribute__((weak)); extern void (*__init_array_start []) (void) __attribute__((weak)); extern void (*__init_array_end [

undefined reference to “only some math.h” functions

孤者浪人 提交于 2019-12-28 06:22:06
问题 I am having a strange problem. The math libraries has been added to my makefile. # include standard C library LDFLAGS += -lc # include standard math library LDFLAGS += -lm and in the output file (.map) I can see that everything has been linked properly: LOAD c:/gnu/powerpc-eabi/3pp.ronetix.powerpc-eabi/bin/../lib/gcc/powerpc-eabi/4.3.3/nof\libgcc.a LOAD c:/gnu/powerpc-eabi/3pp.ronetix.powerpc-eabi/bin/../lib/gcc/powerpc-eabi/4.3.3/../../../../powerpc-eabi/lib/nof\libc.a LOAD c:/gnu/powerpc

Using newlib's malloc in an ARM Cortex-M3

醉酒当歌 提交于 2019-12-20 08:39:06
问题 I'm creating code for an ARM Cortex-M3 (NXP's LCP17xx). I've been using static memory up to now and everything worked well. I tried to add dynamic memory support, but once I call malloc, the system gets stuck. I'm compiling with gcc for arm bare metal, and using newlib. Version: gcc-arm-none-eabi-4_6-2012q1 To add malloc support, I implemented a simple _sbrk function and modified my linker script to make some space for the heap (I've read many different tutorials about this part, but none

How to rebuild newlib and newlib-nano of GNU Arm Embedded Toolchain

血红的双手。 提交于 2019-12-12 17:18:29
问题 I downloaded the toolchain “ gcc-arm-none-eabi-6-2017-q2-update-win32-sha1.exe ” (Windows) from https://developer.arm.com/open-source/gnu-toolchain/gnu-rm/downloads and installed it on my Windows 10 PC. The installation folder contains a release.txt in “ ../share/doc/gcc-arm-none-eabi/ ” which tells: This release includes the following items: newlib and newlib-nano : git://sourceware.org/git/newlib-cygwin.git commit 0d79b021a4ec4e6b9aa1a9f6db0e29a137005ce7 And also the readme.txt in “ ..

Practical way to parse a float with newlib without locale support

随声附和 提交于 2019-12-11 16:48:23
问题 I'm experimenting with NIOS II soft core, trying to minimize the footprint of my embedded app. One of the biggest gains I get comes from using the small C library (p 206): The full newlib library functionality is often unnecessary for embedded systems, and undesirably large for systems needing a minimal RAM footprint. Altera provides a reduced-functionality reduced-size "Small C" version of newlib which allows smaller RAM footprints to be achieved. One of the features stripped down from small

glibc not supported by Cygwin

被刻印的时光 ゝ 提交于 2019-12-06 05:37:11
问题 Cygwin FAQ has the following info for 'Where is glibc?' : Cygwin does not provide glibc. It uses newlib instead, which provides much (but not all) of the same functionality. Porting glibc to Cygwin would be difficult. I was surprised and checked out the release packages as i had earlier used it. While i checked the repositories, it appears that glibc was actually indeed part of cygwin until version 2.10. Can anyone tell of the porting difficulty for the subsequent versions of glibc ? 回答1: The

snprintf() prints garbage floats with newlib nano

久未见 提交于 2019-12-06 01:44:41
问题 I am running a bare metal embedded system with an ARM Cortex-M3 (STM32F205). When I try to use snprintf() with float numbers, e.g.: float f; f = 1.23; snprintf(s, 20, "%5.2f", f); I get garbage into s . The format seems to be honored, i.e. the garbage is a well-formed string with digits, decimal point, and two trailing digits. However, if I repeat the snprintf , the string may change between two calls. Floating point mathematics seems to work otherwise, and snprintf works with integers, e.g.:

glibc not supported by Cygwin

送分小仙女□ 提交于 2019-12-04 11:35:01
Cygwin FAQ has the following info for 'Where is glibc?' : Cygwin does not provide glibc. It uses newlib instead, which provides much (but not all) of the same functionality. Porting glibc to Cygwin would be difficult. I was surprised and checked out the release packages as i had earlier used it. While i checked the repositories, it appears that glibc was actually indeed part of cygwin until version 2.10. Can anyone tell of the porting difficulty for the subsequent versions of glibc ? The Cygwin FAQ is correct, of course; glibc has never been part of Cygwin. The C library on Cygwin is cygwin1

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