What are the compile option differences between --specs=nosys.specs and --specs=rdimon.specs in arm-none-eabi-gcc?

1. As title. and what time I need to add options ? I know add --specs=nano.specs thas is mean using newlib-nano when I use arm-none-eabi-gcc. In readme, rdimon is for semihosting. Nosys is for...
GCC+Keil printf cann't retarget to uart

HI,I Want use gun in keil.now,Can't output debug log to uart.I have implement fputc like this: int fputc(int ch, FILE *f) { if (s_debugInit) { UART_SendData(DEBUG_UART, ch); } return ch; } but when...
Static library links differently with gcc ld and armlink

Hi, I've built a static library using arm-none-eabi-gcc and used the -fdata-sections, -ffunction-sections, and --gc-sections to reduce the library memory footprint. I've used that library successfully...
arm-...-gcc 8.3.1 VS 4.9.3

Dears, I have been compiling with arm-none-eabi-gcc version 4.9.3 for a while; and everything were just fine with a Cortex-M0 I recently have tried using version 8.3.1 and things are not going as well...
How to use aarch64-elf-gcc to print hello world

1. aarch64-elf-gcc need use glibc2.14 while our central version up to glibc-2.12 only 2. I have downloaded glibc-2.14 in my local directory 3 I try to set LD_LIBRARY_PATH to my local glibc-2.14 directory...