[CMake] Scanning dependencies of target xxx is very slow.

[Alexander Neundorf]

On Monday, June 06, 2011 05:28:48 AM jianhua wrote:
> Hi Neundorf;
> 
> Thanks for your kindly response on this issue.
> 
> >Usually it is not that slow.
> >Can you give us some more information ?
> >Of how many files consists your target approximately ?
> >Under which operating system ?
> >Is it maybe on NFS or samba ?
> 
> I try to build a lib based on about 300 source files.
> OS: Ubuntu 10.04 based on Oracle VM VirtualBox.
> CMKAE: V 2.8.3
> 
> I use NFS,  files share between WinXP and VM VirtualBox, but I don't think
> it is root cause here, since if only using native Linux Ext3, the same,
> very slow to scan dependency.
> 
> Now I use make mylib/fast to go on, otherwise it will block undergoing
> process.
> 
> My question: which factors will cause it so low?
> 
> a) Bad design, header files dependency so much.

Yes.

> b) CMake  INCLUDE_DIRECTORIES, too many include?
Yes.

The NSF and VirtualBox probably also don't make things go faster.

Alex