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Re: [Discuss-gnuradio] cmake max version test?

From: Tom Rondeau
Subject: Re: [Discuss-gnuradio] cmake max version test?
Date: Thu, 1 Nov 2012 12:04:58 -0400

On Thu, Nov 1, 2012 at 12:01 PM, Michael Dickens <address@hidden> wrote:
> It turns out that gr-qtgui isn't compatible with the QWT 6 API.  It works 
> with QWT 5.2.1 and 5.1.2; I don't know about 5.0.2 or earlier.
> Does anyone know if there a (simple) way in CMake to check that the library 
> is -not- of a specific version?  For example:
> find_package(Qwt "< 6")
> where the "< 6" is used for version checking.  We could use 'find_package(Qwt 
> 5)' but then I don't know if the gr-qtgui is compatible with QWT 4.2.0 (and, 
> I'm not inclined to do so given that that version dates to 2004).  QWT does 
> not install a PKGCONFIG, not a "qwt-config" type of script; as far as I can 
> tell, the only way to verify its version is by either checking that of the 
> installed library or its headers (and, for cross-OS compatibility I'd guess 
> the latter).
> I'd love to see an updated gr-qtgui, but the QWT 6 API is quite different 
> than that from 5 & there are a number of changes that would be required in 
> the GR code -- so, probably not anytime soon given the number of changes that 
> would be required.
> Anyway, wondering if anyone knows of a simple solution.  Thanks! - MLD

gr-qtgui /should/ be compatible with QWT6. I've been running it on
QWT6 on my systems since 12.04 came out. If there are specific
problems, we can patch it.

If you look inside the code, there are quite a few places where you'll
see #if's checking for the QWT version to do the right thing.


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