newlib

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

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.: snprintf(s, 20, "%10d", 1234567); I use the newlib-nano implementation with the -u _printf_float

I want my exception handlers and debug functions to be able to print call stack backtraces, basically just like the backtrace() library function in glibc. Unfortunately, my C library (Newlib) doesn't provide such a call. I've got something like this: #include <unwind.h&gt // GCC's internal unwinder, part of libgcc _Unwind_Reason_Code trace_fcn(_Unwind_Context *ctx, void *d) { int *depth = (int*)d; printf("\t#%d: program counter at %08x\n", *depth, _Unwind_GetIP(ctx)); (*depth)++; return _URC_NO_REASON; } void print_backtrace_here() { int depth = 0; _Unwind_Backtrace(&trace_fcn, &depth); }

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 cover the problem that I encountered next). With the help of some leds, I can be certain that the code

I am new to the world of STM32F103. I have a demo code for STM32F103 and I am using arm-none-eabi to compile it. I tried what I could find on Google, but nothing worked so far. I have already spent three days on the problem. Anyone can give me a demo code for printf which works well? Part of my makefile: CFLAG = -mcpu=$(CPU) -mthumb -Wall -fdump-rtl-expand -specs=nano.specs --specs=rdimon.specs -Wl,--start-group -lgcc -lc -lm -lrdimon -Wl,--end-group LDFLAG = -mcpu=$(CPU) -T ./stm32_flash.ld -specs=nano.specs --specs=rdimon.specs -Wl,--start-group -lgcc -lc -lm -lrdimon -Wl,--end-group SamR