GNU Arm Embedded Toolchain

[nano-]newlib libraries and cortex-m3, ldr problem

Asked by Martin Velek

Hello,

how is managed the -mfix-cortex-m3-ldrd in [nano-]newlib? As far as I know, the library is compiled for armv7-m (arm-none-eabi-gcc --print-multi-lib) but not with -mcpu=cortex-m3. Does it mean that when I compile my code with -mcpu=cortex-m3 and use the libary with ../arm-none-eabi/lib/armv7-m/libc.a I could get error in LDR? I suppose neither compiler nor linker will modify code in the library.

Martin

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Thomas Preud'homme
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Best Thomas Preud'homme (thomas-preudhomme) said : 		#1

Hi Martin,

-march=armv7-m is actually equivalent to -mcpu=cortex-m3 and as you know this fix is enabled by default for cortex-m3. Therefore, newlib and newlib-nano for cortex-m3 are effectively built with the fix enabled and you will not get any error when using them.

Best regards,

Thomas

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Martin Velek (martin-velek) said : 		#2

Thanks Thomas Preud'homme, that solved my question.