FYI: what it takes for RAM+swap to build devel/llvm40 with 4 processors or cores and WITH__DEBUG= (powerpc64 example)

[Matthew Rezny]

On Wednesday 05 April 2017 19:44:51 Slawa Olhovchenkov wrote:
> On Wed, Apr 05, 2017 at 04:15:41PM +0000, Alexey Dokuchaev wrote:
> > > I've also tried without WITH_DEBUG= and now. . .
> > > 
> > > # pkg delete llvm40
> > > Checking integrity... done (0 conflicting)
> > > Deinstallation has been requested for the following 1 packages (of 0
> > > packages in the universe):
> > > 
> > > Installed packages to be REMOVED:
> > >         llvm40-4.0.0
> > > 
> > > Number of packages to be removed: 1
> > > 
> > > The operation will free 1 GiB.
> > 
> > That 1G looks like a big jump from 259M of llvm39-3.9.1_1.txz to me.
> > I'm surely looking forward modularization of LLVM port; rebuilding it
> > every time becomes a real PITA given that X11 stack requires it. :-(
> 
> What real reason of requiring llvm for X11?
> I am about run time depends:
> 
> # pkg info -r llvm39
> llvm39-3.9.1_4:
>         libEGL-13.0.6
>         dri-13.0.6,2
> 
> # ldd /usr/local/lib/libXvMCr600.so
> /usr/local/lib/libXvMCr600.so:
> [...]
>         libLLVM-3.9.so => /usr/local/llvm39/lib/libLLVM-3.9.so (0x803e00000)
> libLTO.so => /usr/local/llvm39/lib/../lib/libLTO.so (0x808200000) [...]
> 
> # ls -lh /usr/local/llvm39/lib/libLLVM-3.9.so
> /usr/local/llvm39/lib/../lib/libLTO.so -rwxr-xr-x  1 root  wheel    38M Apr
>  2 18:18 /usr/local/llvm39/lib/../lib/libLTO.so -rwxr-xr-x  1 root  wheel  
>  47M Apr  2 18:18 /usr/local/llvm39/lib/libLLVM-3.9.so
> 
> libXvMCr600 realy do run-time llvm interpetation and linker-time
> optimisation?!
> 
> Also, I am don't see any realy dependence libEGL-13.0.6 from llvm.

Yes, Mesa really uses LLVM at runtime for shader compilation/optimization, and 
Xorg depends on Mesa for GLX, etc.