Re: pipe2 & configure script

[Paolo Bonzini]

On 07/07/21 06:42, Thomas Huth wrote:
> > What conditions are required for "#define CONFIG_PIPE2" to be set in 
> > build/config-host.h? It prevents building for Haiku as pipe2() doesn't 
> > exist. I didn't see anything in the configure script regarding pipe2. 
> > I also updated my code to the latest in the repository and this issue 
> > just popped up.
>
> CONFIG_PIPE2 is set from meson.build instead of the configure script. 
> But why is this blocking your build? The only relevant spot is in 
> util/oslib-posix.c and there is a fallback to the normal pipe() function 
> there...

I suspect the compilation is succeeding with a warning, but linking is 
not successful.  The correct fix is anyway to use a linker test, because 
a compiler test would not detect a broken system header/library combo, 
where the prototype is defined but the function is not included.

Paolo