llvm dev - Oct 2011 - [LLVMdev] [cfe-dev] RFC: Upcoming Build System Changes

> BTW, adding explicit library dependencies will make the parallel builds
> worse, because you know when a dependency is missing (the build fails)
> but you don't know when a dependency is superfluous.
Computing the dependencies creates a point in the build that depends on 
all libraries and all tools depend on it. The explicit dependencies 
would have to be in a really bad state to be this bad.

Cheers,
Rafael

Rafael Ávila de Espíndola <rafael.espindola at gmail.com> writes:
>> BTW, adding explicit library dependencies will make the parallel builds
>> worse, because you know when a dependency is missing (the build fails)
>> but you don't know when a dependency is superfluous.
>
> Computing the dependencies creates a point in the build that depends on 
> all libraries and all tools depend on it. The explicit dependencies 
> would have to be in a really bad state to be this bad.
First: that's a single point in the build, while superfluous
dependencies may affect almost all points.

Second: if that is a problem, we can get rid of it by changing a single
line [1]. IIRC, it is a remains of the implementation as it was when
first created, when the dependencies were automatically generated and
the build re-started in case of any change. Now it is unncessary.

[1] I'm talking about the state of the cmake build as it was when I
    left. Maybe it was already removed.

On Fri, Oct 28, 2011 at 3:19 PM, Óscar Fuentes <ofv at wanadoo.es> wrote:
> [1] I'm talking about the state of the cmake build as it was when I
>    left. Maybe it was already removed.
>
For the record, it is already gone from the current CMake build.
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