Re: [Qemu-discuss] console output with -nographic on Windows

[Brendan Simon (eTRIX)]

On 17/9/18 9:43 pm, Thomas Huth wrote:

> On 2018-09-17 13:26, Brendan Simon (eTRIX) wrote:
>> I've been trying to use the following GNU MCU Eclipse QEMU releases to
>> do unit tests for ARM Cortex binaries.
>>
>> https://gnu-mcu-eclipse.github.io/qemu/
>> https://gnu-mcu-eclipse.github.io/qemu/releases/
>>
>> I compiled the very simple semi-hosting hello world sample in the gcc
>> arm installation (from ARM download site).  It's a basic `printf("Hello
>> world!");`
>>
>> It runs ok on the Mac.  i.e. displays "Hello world!" on the terminal
>> that I run qemu from.
>>
>> However the same command line and exact same binary does not show any
>> output when run on a Windows box (Win 10).  I tried from MSYS2 bash
>> shell and Windows Command Prompt, and both show no output.
>>
>> A bit of googling suggests that it displaying console output just
>> doesn't work on Windows.
>>
>> Is that really true?  Why can't Windows output to stdout?  Surely it's
>> technically possible, and not too difficult?  Surely there must be a way
>> to get stdout working Windows.
>>
>> What magic do I have to do to get this working?
> Is your QEMU binary using SDL1.2 ? In that case, it's likely that SDL
> redirects stdout into a file. Try a binary that is linked against SDL2
> instead - as far as I know, SDL2 does not do this redirecation anymore.

Not really sure as I'm running a pre-built binary, but the libraries in
the install directory suggest it is SDL2.

$ ls ~/opt/gnu-mcu-eclipse/qemu/2.8.0-3-20180523-0703/bin/
libSDL2-2.0.0.dylib       libglib-2.0.0.dylib      
libintl.8.dylib           libz.1.dylib
libSDL2_image-2.0.0.dylib libgthread-2.0.0.dylib   
libpixman-1.0.dylib       qemu-system-gnuarmeclipse
libgcc_s.1.dylib          libiconv.2.dylib          libstdc++.6.dylib

and the build script on github suggests it is:
    SDL2_VERSION="2.0.5"

https://github.com/gnu-mcu-eclipse/qemu-build/blob/master/scripts/container-build.sh

Brendan.