lrelease compiled with GCC 9.2.1 is not working

On Ubuntu 19.10, released with GCC 9.2.1, we were unable to cross compile Qt 4.8.7. On the Ubuntu 19.04 released with GCC 8.3.0 it works fine.

The build fails when calling the lrealease (build with system GCC) on the *.ts files, the error is the following :

lrelease error: Unknown format auto for file assistant_cs.ts

If we install the gcc-8 and g+-8 packages on the 19.10 installation and set them as the gcc and g+ update-alternatives defaults, then the build is also fine.

So it seems that the lrelease app build with gcc 9.2.1 cannot be run after... It compiles the lrelease software, but cannot be run...

You'll find in attached files the full log of compilation on the Ubuntu 19.04 and Ubuntu 19.10.