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- To: "Benoît Jacob" <jacob@xxxxxxxxxxxxxxx>
- Subject: Re: [eigen] on CoreDeclarations
- From: "Gael Guennebaud" <gael.guennebaud@xxxxxxxxx>
- Date: Thu, 28 Aug 2008 15:28:30 +0200
- Cc: eigen@xxxxxxxxxxxxxxxxxxx
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On Thu, Aug 28, 2008 at 3:09 PM, Benoît Jacob <jacob@xxxxxxxxxxxxxxx> wrote:
>
> Do you know if g++ has the precompiled-headers feature? Is that easy to use in
> the context of a cmake/make/g++ project?
that's easy, create a file (with the .h extension, mandatory):
MyPCH.h
#include <Eigen/Core>
#include <another_stable_header_used_everywhere_in_my_project>
....
g++ -c CXXFLAGS path/to/MyPCH.h
at this point when gcc see : #include "MyPCH.h" it will use the
respective precompiled header file (the optimization/debug flags
*must* be the same)
So in practice you have to include the file MyPCH.h *before* the other
headers (gcc has also an option to specify additional files to
include)
you can have only one precompiled header file.
I managed to use PCH with cmake/g++ on my project, so that's doable !!
(I found some helper cmake module for that, but maybe cmake 2.6 has
some more builtin and cleaner support...)
gael.