link error: can't link soft-float modules with double-float modules

[yangjingchi]

i got the following error when try to cross-compile a hello world program with printf.
I google the error and it seems that it was a know issue for gnu-toolchain but i think it's fixed few month ago

Also i notice that in the fpga bootrom, there is a uart_printf in main function, Is there a reason that bare metal program not using the standard printf?

riscv64-unknown-elf-gcc -Os -march=rv64imac -mabi=lp64 -Wall -mcmodel=medany -mexplicit-relocs -I./ -c main.c -o main.o
main.c ==> main.o

riscv64-unknown-elf-gcc -Os -march=rv64imac -mabi=lp64 -Wall -mcmodel=medany -mexplicit-relocs -I./ -Tlinker.lds main.o -o main.elf

/opt/riscv/lib/gcc/riscv64-unknown-elf/10.1.0/../../../../riscv64-unknown-elf/bin/ld: main.o: can't link soft-float modules with double-float modules
/opt/riscv/lib/gcc/riscv64-unknown-elf/10.1.0/../../../../riscv64-unknown-elf/bin/ld: failed to merge target specific data of file main.o
/opt/riscv/lib/gcc/riscv64-unknown-elf/10.1.0/../../../../riscv64-unknown-elf/bin/ld: /opt/riscv/lib/gcc/riscv64-unknown-elf/10.1.0/../../../../riscv64-unknown-elf/lib/crt0.o: in function _start': (.text+0x0): undefined reference to __global_pointer$'
/opt/riscv/lib/gcc/riscv64-unknown-elf/10.1.0/../../../../riscv64-unknown-elf/bin/ld: (.text+0x10): undefined reference to _end' /opt/riscv/lib/gcc/riscv64-unknown-elf/10.1.0/crtbegin.o: in function __do_global_dtors_aux':
crtstuff.c:(.text+0x0): relocation truncated to fit: R_RISCV_HI20 against completed.1' /opt/riscv/lib/gcc/riscv64-unknown-elf/10.1.0/../../../../riscv64-unknown-elf/lib/libc.a(lib_a-exit.o): in function exit':
exit.c:(.text+0xe): relocation truncated to fit: R_RISCV_HI20 against symbol _global_impure_ptr' defined in .srodata section in /opt/riscv/lib/gcc/riscv64-unknown-elf/10.1.0/../../../../riscv64-unknown-elf/lib/libc.a(lib_a-impure.o) /opt/riscv/lib/gcc/riscv64-unknown-elf/10.1.0/../../../../riscv64-unknown-elf/lib/libc.a(lib_a-printf.o): in function _printf_r':
printf.c:(.text+0x22): relocation truncated to fit: R_RISCV_HI20 against symbol _impure_ptr' defined in .sdata section in /opt/riscv/lib/gcc/riscv64-unknown-elf/10.1.0/../../../../riscv64-unknown-elf/lib/libc.a(lib_a-impure.o) /opt/riscv/lib/gcc/riscv64-unknown-elf/10.1.0/../../../../riscv64-unknown-elf/lib/libc.a(lib_a-vfprintf.o): in function .L3':
vfprintf.c:(.text+0xac): relocation truncated to fit: R_RISCV_HI20 against .LC10' /opt/riscv/lib/gcc/riscv64-unknown-elf/10.1.0/../../../../riscv64-unknown-elf/lib/libc.a(lib_a-wsetup.o): in function __swsetup_r':
wsetup.c:(.text+0x0): relocation truncated to fit: R_RISCV_HI20 against symbol _impure_ptr' defined in .sdata section in /opt/riscv/lib/gcc/riscv64-unknown-elf/10.1.0/../../../../riscv64-unknown-elf/lib/libc.a(lib_a-impure.o) /opt/riscv/lib/gcc/riscv64-unknown-elf/10.1.0/../../../../riscv64-unknown-elf/lib/libc.a(lib_a-__call_atexit.o): in function __call_exitprocs':
__call_atexit.c:(.text+0x2): relocation truncated to fit: R_RISCV_HI20 against symbol _global_impure_ptr' defined in .srodata section in /opt/riscv/lib/gcc/riscv64-unknown-elf/10.1.0/../../../../riscv64-unknown-elf/lib/libc.a(lib_a-impure.o) /opt/riscv/lib/gcc/riscv64-unknown-elf/10.1.0/../../../../riscv64-unknown-elf/lib/libc.a(lib_a-__call_atexit.o): in function register_fini':
__call_atexit.c:(.text.startup+0x6): relocation truncated to fit: R_RISCV_HI20 against symbol __libc_fini_array' defined in .text section in /opt/riscv/lib/gcc/riscv64-unknown-elf/10.1.0/../../../../riscv64-unknown-elf/lib/libc.a(lib_a-fini.o) /opt/riscv/lib/gcc/riscv64-unknown-elf/10.1.0/../../../../riscv64-unknown-elf/lib/libc.a(lib_a-fflush.o): in function .L60':
fflush.c:(.text+0x1cc): relocation truncated to fit: R_RISCV_HI20 against symbol _impure_ptr' defined in .sdata section in /opt/riscv/lib/gcc/riscv64-unknown-elf/10.1.0/../../../../riscv64-unknown-elf/lib/libc.a(lib_a-impure.o) /opt/riscv/lib/gcc/riscv64-unknown-elf/10.1.0/../../../../riscv64-unknown-elf/lib/libc.a(lib_a-findfp.o): in function _cleanup_r':
findfp.c:(.text+0x4): relocation truncated to fit: R_RISCV_HI20 against symbol _fclose_r' defined in .text section in /opt/riscv/lib/gcc/riscv64-unknown-elf/10.1.0/../../../../riscv64-unknown-elf/lib/libc.a(lib_a-fclose.o) /opt/riscv/lib/gcc/riscv64-unknown-elf/10.1.0/../../../../riscv64-unknown-elf/lib/libc.a(lib_a-freer.o): in function _malloc_trim_r':
mallocr.c:(.text+0x4): relocation truncated to fit: R_RISCV_HI20 against symbol __malloc_av_' defined in .data section in /opt/riscv/lib/gcc/riscv64-unknown-elf/10.1.0/../../../../riscv64-unknown-elf/lib/libc.a(lib_a-mallocr.o) /opt/riscv/lib/gcc/riscv64-unknown-elf/10.1.0/../../../../riscv64-unknown-elf/lib/libc.a(lib_a-ldtoa.o): in function .L272':
ldtoa.c:(.text+0xa24): additional relocation overflows omitted from the output
collect2: error: ld returned 1 exit status
make: *** [main.elf] Error 1

[Chakri-myneni]

riscv-collab/riscv-gnu-toolchain#784
@yangjingchi please refer to the above link.
I think the problem is related to version of your gcc.

[zarubaf]

You need to have a multilib toolchain installed. You can also get a pre-built toolchain from SiFive (which is what I would recommend).