printf with format 'lld' or 'llx' failed

[zfchen819]

CPU: E21
toolchain: riscv64-unknown-elf-gcc-8.3.0-2020.04.0-x86_64-linux-ubuntu14.tar.gz
when I run hello.c, modify the code as below:
int main(){
unsigned long long val = 0x123456789;
printf("Hello, World! val:0x%llx\n",val);
}
but the run result is:
Hello, World! val:0xlx
could someone help to solve this problem? thank you.

[nick-knight]

SiFive's prebuilt toolchain provides two C libraries: Newlib and Newlib-Nano. To reduce code size, Newlib-Nano has reduced printf functionality. For example, it does not implement C99 formatting capabilities like the ll length modifier.

Freedom-E-SDK uses Newlib-Nano by default. If you switch to Newlib instead, you should gain this capability.

In previous versions of Freedom-E-SDK, switching to Newlib was as simple as deleting the --specs=nano.specs flag from standalone.mk. I don't know if this trick works in more recent versions, however. And even if it does, the increased code size of Newlib (not -Nano) may cause linker errors.

[zfchen819]

SiFive's prebuilt toolchain provides two C libraries: Newlib and Newlib-Nano. To reduce code size, Newlib-Nano has reduced printf functionality. For example, it does not implement C99 formatting capabilities like the ll length modifier.

Freedom-E-SDK uses Newlib-Nano by default. If you switch to Newlib instead, you should gain this capability.

In previous versions of Freedom-E-SDK, switching to Newlib was as simple as deleting the --specs=nano.specs flag from standalone.mk. I don't know if this trick works in more recent versions, however. And even if it does, the increased code size of Newlib (not -Nano) may cause linker errors.

Thanks a lot for your perfect reply.
Now printf fuction works as expected. but another question want to ask you.

when I call getchar() function, it always return '-1', i don't know what's the reason.

[nick-knight]

I've never tried getchar before, sorry. I suggest you open a new issue, I will close this one.