TL;DR it's probably due to some cmake mess. and i gave up on compiling this; if i really want to, i'll do it in a debian chroot.
> > i tried with your gcc … but it errors out with: > > > > $ make > > [ 1%] Linking ASM executable bs2_default.elf > > arm-none-eabi-gcc: error: nosys.specs: No such file or directory > > > That file is located here: > /gnu/store/…-newlib-arm-none-eabi-4.3.0/arm-none-eabi/lib/nosys.specs that didn't help: ~/workspace/guix/guix/pre-inst-env guix shell gcc-toolchain cmake make pkg-config -e '(@ (gnu packages embedded2) gcc12-cross-newlib-arm-none-eabi-toolchain)' cd ~/workspace/bios/pico-serprog cmake . COMPILER_PATH=/gnu/store/i9kpjzbagdlpm8bs10gxmm21b271s056-newlib-3.0.0-0.3ccfb40/arm-none-eabi/lib/ LDFLAGS=-B/gnu/store/i9kpjzbagdlpm8bs10gxmm21b271s056-newlib-3.0.0-0.3ccfb40/arm-none-eabi/lib/ make it leads to the same problem. but then i tried to compile the pico-sdk subproject as a standalone project, and then it succeeds (but fails with a different error later). therefore i think it's due to some cmake mess that i don't want to get deeper into. so, the rest is just FYI: git clone https://github.com/raspberrypi/pico-sdk ~/workspace/guix/guix/pre-inst-env guix shell gcc-toolchain cmake make pkg-config -e '(@ (gnu packages embedded2) gcc12-cross-newlib-arm-none-eabi-toolchain)' cmake . make $ make [ 0%] Building ASM object src/rp2_common/boot_stage2/CMakeFiles/bs2_default.dir/compile_time_choice.S.obj [ 0%] Linking ASM executable bs2_default.elf [ 0%] Built target bs2_default [ 0%] Creating directories for 'ELF2UF2Build' [ 0%] No download step for 'ELF2UF2Build' [ 0%] No update step for 'ELF2UF2Build' [ 0%] No patch step for 'ELF2UF2Build' [ 0%] Performing configure step for 'ELF2UF2Build' -- The C compiler identification is unknown -- The CXX compiler identification is unknown -- Detecting C compiler ABI info -- Detecting C compiler ABI info - failed -- Check for working C compiler: /gnu/store/3yqw7js9slid5q3d1f5bpbk92vann109-profile/bin/gcc -- Check for working C compiler: /gnu/store/3yqw7js9slid5q3d1f5bpbk92vann109-profile/bin/gcc - broken CMake Error at /gnu/store/4bn07jsqk6lxp0qdxv7kkc3krz3afnna-cmake-3.25.1/share/cmake-3.25/Modules/CMakeTestCCompiler.cmake:70 (message): The C compiler "/gnu/store/3yqw7js9slid5q3d1f5bpbk92vann109-profile/bin/gcc" is not able to compile a simple test program. It fails with the following output: Change Dir: /home/alendvai/workspace/bios/pico-sdk/elf2uf2/CMakeFiles/CMakeScratch/TryCompile-fg3QLY Run Build Command(s):/gnu/store/3yqw7js9slid5q3d1f5bpbk92vann109-profile/bin/make -f Makefile cmTC_12bac/fast && make[3]: Entering directory '/home/alendvai/workspace/bios/pico-sdk/elf2uf2/CMakeFiles/CMakeScratch/TryCompile-fg3QLY' /gnu/store/3yqw7js9slid5q3d1f5bpbk92vann109-profile/bin/make -f CMakeFiles/cmTC_12bac.dir/build.make CMakeFiles/cmTC_12bac.dir/build make[4]: Entering directory '/home/alendvai/workspace/bios/pico-sdk/elf2uf2/CMakeFiles/CMakeScratch/TryCompile-fg3QLY' Building C object CMakeFiles/cmTC_12bac.dir/testCCompiler.c.o /gnu/store/3yqw7js9slid5q3d1f5bpbk92vann109-profile/bin/gcc -o CMakeFiles/cmTC_12bac.dir/testCCompiler.c.o -c /home/alendvai/workspace/bios/pico-sdk/elf2uf2/CMakeFiles/CMakeScratch/TryCompile-fg3QLY/testCCompiler.c as: unrecognized option '--64' make[4]: *** [CMakeFiles/cmTC_12bac.dir/build.make:78: CMakeFiles/cmTC_12bac.dir/testCCompiler.c.o] Error 1 make[4]: Leaving directory '/home/alendvai/workspace/bios/pico-sdk/elf2uf2/CMakeFiles/CMakeScratch/TryCompile-fg3QLY' make[3]: *** [Makefile:127: cmTC_12bac/fast] Error 2 make[3]: Leaving directory '/home/alendvai/workspace/bios/pico-sdk/elf2uf2/CMakeFiles/CMakeScratch/TryCompile-fg3QLY' the root cause of the messy error message above is the following: as: unrecognized option '--64' this happens with the host gcc (or due to some misconfiguration the host gcc is used wrongly). $ file src/rp2_common/boot_stage2/bs2_default.elf src/rp2_common/boot_stage2/bs2_default.elf: ELF 32-bit LSB executable, ARM, EABI5 version 1 (SYSV), statically linked, not stripped -- • attila lendvai • PGP: 963F 5D5F 45C7 DFCD 0A39 -- “Perfection is achieved, not when there is nothing more to add, but when there is nothing left to take away.” — Antoine de Saint-Exupery (1900–1944)
