Add picolibc compatibilty #1
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…chain) compatibility in the compilation toolchain. The commit also adds "printf" possible usage using picolibc.
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This PR adds
picolibcC standard library (https://github.com/picolibc/picolibc) compatibility. This is useful e.g. under Debian and some other distros where the RISC-V toolchain comes with a packagedpicolibcbut no packagednewlibfor this target.Under Debian
trixieor Ubuntujammy:$ sudo apt install gcc-riscv64-unknown-elf picolibc-riscv64-unknown-elfThe PR should not break the regular original compilation with
newlibas it is only activated when the environment variableUSE_PICOLIBC=1is exported.The profiling script
flow/eprof.pyhas been adapted to handle cases where source references from the debug symbols are not present in the toolchain (in this case the script skips these files).