Re: [Boost-build] how to add include directories for compile but not for scan

Subject: Re: [Boost-build] how to add include directories for compile but not for scan
From: Nogradi, Chris (Chris.Nogradi_at_[hidden])
Date: 2012-04-23 08:50:19

Thanks for correcting me.  I presumed that since the compiler had less to do, that bjam would also have less to do.  But I do remember now that the header scanner is dumb and always looks at all headers in a file and from the documentation:

"Precompiled headers must be used purely as a way to improve compilation time, not to save the number of #include statements. If a source file needs to include some header, explicitly include it in the source file, even if the same header is included from the precompiled header. This makes sure that your project will build even if precompiled headers are not supported."

Maybe the header scanner for C/C++ files could be improved to be pre-compiler aware?

Chris

-----Original Message-----
From: boost-build-bounces_at_[hidden] [mailto:boost-build-bounces_at_[hidden]] On Behalf Of George Georgiev
Sent: Friday, April 20, 2012 5:59 PM
To: Boost.Build developer's and user's list
Subject: Re: [Boost-build] how to add include directories for compile but not for scan

Precompiled headers feature optimizes the compilation process. I am
looking for feature that optimizes the dependency checking (scanning)
process.

For example instead:
    lib prebuilt_xerces
      :
      :
        xerces/lib/xerces-c_static_3.lib
      :
      :
        <include>xerces/include
        <library>advapi32
        <define>XERCES_STATIC_LIBRARY
      ;

I to be able to do:
...
       <compile-include>xerces/include
...

or something, that will result in all the headers in xerces/include to
be ignored during the dependency scanning process, but xerces/include
still to be added in the list of additinal include directories when
the compiler is executed.

Thanks,
George

On Fri, Apr 20, 2012 at 12:56 PM, Nogradi, Chris
<Chris.Nogradi_at_[hidden]> wrote:
> Take a look at the precompiled headers feature. I have not yet used it but it may be what you are looking for.
>
> Chris
>
> -----Original Message-----
> From: boost-build-bounces_at_[hidden] [mailto:boost-build-bounces_at_[hidden]] On Behalf Of George Georgiev
> Sent: Friday, April 20, 2012 2:28 PM
> To: boost-build_at_[hidden]
> Subject: [Boost-build] how to add include directories for compile but not for scan
>
> Hi,
>
> I am working on project depending on very big number of external
> libraries. I very rarely (never) change the header files for these
> libraries.
>
> Is there a way to specify some of the <include>s to be added to the
> compiler instructions but to be ignored from bjam scan.
>
> Thanks,
> George
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