Hello all, I am trying to build for a bare metal target without any OS support and I want to omit libc (newlib). So I add -ffunction-sections -nostdlib -ffreestanding flags to assembler/compiler and -lnosys -nolibc -nodefaultlibs -nostartfiles -nostdlib -ffreestanding -static-libgcc -lgcc -lnosys -nolibc -nodefaultlibs -nostartfiles -nostdlib -ffreestanding -static-libgcc -lgcc to linker But gcc still tries to pull newlib: /m/a/local/crossgcc/arm-none-eabi/bin/../lib/gcc/arm-none-eabi/9.3.0/../../../../arm-none-eabi/bin/ld: /m/a/local/crossgcc/arm-none-eabi/bin/../lib/gcc/arm-none-eabi/9.3.0/../../../../arm-none-eabi/lib/thumb/v7e-m+fp/hard/libc.a(lib_a-init.o): in function `__libc_init_array': /var/tmp/builds/crossgcc/src/newlib-3.1.0/newlib/libc/misc/init.c:40: undefined reference to `_init' /m/a/local/crossgcc/arm-none-eabi/bin/../lib/gcc/arm-none-eabi/9.3.0/../../../../arm-none-eabi/bin/ld: /m/a/local/crossgcc/arm-none-eabi/bin/../lib/gcc/arm-none-eabi/9.3.0/../../../../arm-none-eabi/lib/thumb/v7e-m+fp/hard/libc.a(lib_a-sbrkr.o): in function `_sbrk_r': /var/tmp/builds/crossgcc/src/newlib-3.1.0/newlib/libc/reent/sbrkr.c:51: undefined reference to `_sbrk' /m/a/local/crossgcc/arm-none-eabi/bin/../lib/gcc/arm-none-eabi/9.3.0/../../../../arm-none-eabi/bin/ld: /m/a/local/crossgcc/arm-none-eabi/bin/../lib/gcc/arm-none-eabi/9.3.0/../../../../arm-none-eabi/lib/thumb/v7e-m+fp/hard/libc.a(lib_a-writer.o): in function `_write_r': /var/tmp/builds/crossgcc/src/newlib-3.1.0/newlib/libc/reent/writer.c:49: undefined reference to `_write' /m/a/local/crossgcc/arm-none-eabi/bin/../lib/gcc/arm-none-eabi/9.3.0/../../../../arm-none-eabi/bin/ld: /m/a/local/crossgcc/arm-none-eabi/bin/../lib/gcc/arm-none-eabi/9.3.0/../../../../arm-none-eabi/lib/thumb/v7e-m+fp/hard/libc.a(lib_a-closer.o): in function `_close_r': /var/tmp/builds/crossgcc/src/newlib-3.1.0/newlib/libc/reent/closer.c:47: undefined reference to `_close' /m/a/local/crossgcc/arm-none-eabi/bin/../lib/gcc/arm-none-eabi/9.3.0/../../../../arm-none-eabi/bin/ld: /m/a/local/crossgcc/arm-none-eabi/bin/../lib/gcc/arm-none-eabi/9.3.0/../../../../arm-none-eabi/lib/thumb/v7e-m+fp/hard/libc.a(lib_a-lseekr.o): in function `_lseek_r': /var/tmp/builds/crossgcc/src/newlib-3.1.0/newlib/libc/reent/lseekr.c:49: undefined reference to `_lseek' /m/a/local/crossgcc/arm-none-eabi/bin/../lib/gcc/arm-none-eabi/9.3.0/../../../../arm-none-eabi/bin/ld: /m/a/local/crossgcc/arm-none-eabi/bin/../lib/gcc/arm-none-eabi/9.3.0/../../../../arm-none-eabi/lib/thumb/v7e-m+fp/hard/libc.a(lib_a-readr.o): in function `_read_r': /var/tmp/builds/crossgcc/src/newlib-3.1.0/newlib/libc/reent/readr.c:49: undefined reference to `_read' collect2: error: ld returned 1 exit status So what is the magic option to tell gcc not to mess around with libc (newlib)? Thanks! -- Josef Wolf jw@xxxxxxxxxxxxx
