How shaders are compiled?

I only asks.

How shaders are compiled? I known, there is many problems with shader=20
compilation, like users are forced to stay in game menu to wait for shader=
=20
compilation are done.

I known, many software uses approach with two or more compilers. For exampl=
e,=20
Mozilla Firefox launch fast-compiler firstly to be able to ran JavaScript=20
scripts and recompile scripts by compiler do better optimizations.

Maybe Mesa should do the same? And yet. We have shader cache, so you could=
=20
implement daemon which runs on system-idle state and recompile not-well-
optimized shaders to more optimized versions.

When game asks Mesa to compile shader, it does:
1. Ran fast-compiler
2. Register output of 1. to daemon
3. Run compiler doing good-optimizations

And daemon do good optimization on system-idle.

Best regards,
Lach S=C5=82awomir.