QNX with QEMU - running a self-compiled binary

QNX DEVELOPERS General Programming
1

Hi,

I’m working with the recent QNX 8.0 and a bit older 7.1. At the moment I have no access to a baremetal QNX instance and can only test things with a Qemu emulator. My target is aarch64 and the qemu instance is build with mkqnximage:

# first make the image
mkqnximage --type=qemu --hostname=qnxmachine --arch='aarch64le'

# second, run the image
mkqnximage --run

This runs quite well, although some programs are not available (for example showmem is absent). Now, the goal is to cross compile a super-simple program in C and run it on the QNX target, or in my case on the qemu instance. The program is as below:

#include <stdio.h>

int main()
{
    printf("xyz\n");

    return 0;
}

compiled with

qcc -Vgcc_ntoaarch64le -c memshow.c -o memshow -Wc,-Wall

file on memshow returns:

$ file memshow
memshow: ELF 64-bit LSB relocatable, ARM aarch64, version 1 (SYSV), not stripped

After sending the memshow file to the qemu instance with scp and running it, below error occurs. What could be the cause of this error? The file is given execute rights. It seems that the file is not read properly. Could my mkqnximage configuration be missing somthing?

$ chmod +x memshow 

$ ./memshow 
./memshow[1]: syntax error: `QNX8.0.0-rc240b01981e3f0ff1a5e1d2c93b54b9300381e44-102' unexpected

$ ls -lah memshow 
-rwxr-xr-x  1 root root 1.4K 2025-03-20 15:27 memshow

Thanks,
rockerr

2

Based on your file size (1.4K) your executable is relying on libc being in the boot image (which would also require ldqnx, the QNX dynamic lib runtime linker). Note those are normally included in the boot image so that executable files are that small rather than having to carry around the entire C/C++ library embedded in the executable.

Can you post your build file that you used to make the QNX image?

Tim