Simple C++ Compile Error

Robert Evans bobsphysics at
Tue Aug 12 16:25:11 CEST 2008

Leaving off the full path name in the #include and using "-I" option to specify include path works fine, as should have been obvious to me.  Sorry for all the commotion.


----- Original Message ----
From: Marc Glisse <marc.glisse at>
To: Tim Van Holder <tim.vanholder at>
Cc: gmp-bugs at; Robert Evans <bobsphysics at>
Sent: Tuesday, August 12, 2008 5:46:20 AM
Subject: Re: Simple C++ Compile Error

On Tue, 12 Aug 2008, Tim Van Holder wrote:

>>> #include </home/bevans/gmp-4.2.3/include/gmpxx.h>
> While Robert's code is unusual (especially the use of <> instead of ""
> when specifying a full path to a header), it's certainly valid C++.

But not a valid use of gmpxx. You can compare to other packages. For 
instance, freetype or gtk typically require -I/usr/include/freetype2 or 
-I/usr/include/gtk-2.0. These packages have many header files that include 
each other, but still use the <> notation. I don't see why gmp should be 

> Would it not make sense for gmpxx.h to include gmp.h with '#include
> "gmp.h"'?
> That way, no matter how you include gmpxx.h, it will prefer the gmp.h
> that sits alongside it.

I don't like it (but I don't decide). However, having a test in gmpxx that 
checks whether the version of gmp.h included matches and outputs a warning 
(not an error, there can always be good reasons to do strange things) 
otherwise would help diagnose this kind of issue.

Marc Glisse

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