* Determining PCH use
@ 2013-04-17 10:51 Miguel Guedes
2013-04-17 14:49 ` Jeffrey Walton
0 siblings, 1 reply; 3+ messages in thread
From: Miguel Guedes @ 2013-04-17 10:51 UTC (permalink / raw)
To: gcc-help
Hello List,
I'm successfully generating a PCH but am not sure if it is being used as
the project is built out of source. The generated `pch.hxx.gch' is
created in the same directory as the `pch.hxx' header but everything else
- objects, libraries, binaries, dependencies - are created out of
source.
Have tried passing the -H switch but I can't see the actual `pch.hxx.gch'
PCH being used; only `pch.hxx' shows up in the long list of include
files.
Should the -H switch be showing the `pch.hxx.gch' PCH? If not, is there
any other way of determining if the PCH is being used? Probably
irrelevant but have also used `-Winvalid-pch' and no warnings are output.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Determining PCH use
2013-04-17 10:51 Determining PCH use Miguel Guedes
@ 2013-04-17 14:49 ` Jeffrey Walton
2013-04-17 15:24 ` Miguel Guedes
0 siblings, 1 reply; 3+ messages in thread
From: Jeffrey Walton @ 2013-04-17 14:49 UTC (permalink / raw)
To: Miguel Guedes; +Cc: gcc-help
On Wed, Apr 17, 2013 at 6:51 AM, Miguel Guedes
<miguel.a.guedes@gmail.com> wrote:
>
> I'm successfully generating a PCH but am not sure if it is being used as
> the project is built out of source. The generated `pch.hxx.gch' is
> created in the same directory as the `pch.hxx' header but everything else
> - objects, libraries, binaries, dependencies - are created out of
> source.
>
> Have tried passing the -H switch but I can't see the actual `pch.hxx.gch'
> PCH being used; only `pch.hxx' shows up in the long list of include
> files.
>
> Should the -H switch be showing the `pch.hxx.gch' PCH? If not, is there
> any other way of determining if the PCH is being used? Probably
> irrelevant but have also used `-Winvalid-pch' and no warnings are output.
In the past I used the following [hack] in pch.hxx to verify use of
precompiled headers:
#pragma message("Including precompiled header file.")
If it shows up once, then you are using precompiled headers. If it
shows up multiple times, you are not.
Jeff
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: Determining PCH use
2013-04-17 14:49 ` Jeffrey Walton
@ 2013-04-17 15:24 ` Miguel Guedes
0 siblings, 0 replies; 3+ messages in thread
From: Miguel Guedes @ 2013-04-17 15:24 UTC (permalink / raw)
To: noloader; +Cc: gcc-help
On Wed, 2013-04-17 at 10:49 -0400, Jeffrey Walton wrote:
> In the past I used the following [hack] in pch.hxx to verify use of
> precompiled headers:
>
> #pragma message("Including precompiled header file.")
>
> If it shows up once, then you are using precompiled headers. If it
> shows up multiple times, you are not.
Oh no, I've got a problem then - pragma message is output each time the
PCH header is included. Any tips on how I can go about diagnosing this
PCH non inclusion issue?
Many thanks for the pragma tip, Jeffrey!
--
Miguel
^ permalink raw reply [flat|nested] 3+ messages in thread
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