Re: [gpsd-users] versioning. Was: Shared memory interface with gpsd restart results in no data for client

[Charles Curley]

On Fri, 15 Jun 2018 16:13:41 -0700
"Gary E. Miller" <address@hidden> wrote:

> > Not entirely. My GnomeGPS minimal brain-dead client does survive a
> > gpsd restart.  
> 
> Oh, I was thinking gpsd included clients.
> 
> > https://github.com/charlescurley/gnome-gps  
> 
> I grabbed a copy, does not compile for me:
> 
> # make
> cd src && make production
> make[1]: Entering directory '/u/local/src/GPS/gnome-gps/src'
> gcc -O2 -o gnome-gps.o -Wall -c -Wno-deprecated-declarations
> gnome-gps.c `pkg-config --cflags --libs gtk+-2.0 libgps`
> gnome-gps.c:32:2: error: #error Unknown gps API protocol version; see
> gps.h for the current value of GPSD_API_MAJOR_VERSION #error Unknown
> gps API protocol version; see gps.h for the current value of
> GPSD_API_MAJOR_VERSION ^~~~~ make[1]: *** [Makefile:26: gnome-gps.o]
> Error 1 make[1]: Leaving directory '/u/local/src/GPS/gnome-gps/src'
> make: *** [Makefile:5: production] Error 2

That would be because someone bumped the version number when I wasn't
looking. I'll do a quick update. Thanks. 


> 
> You want to check the version at runtime, not when you compile.

Ah, OK. That makes for a more flexible client.

I see two problems here.

* Aesthetic. This would require one or more tests for version number in
  the run time. My ancient embedded programming habits tell me the
  fewer branches the better. None the less, do-able.

* Library loading: How do I tell the library loader which version of
  libgps I want? Or does the loader handle that for me?

-- 
"When we talk of civilization, we are too apt to limit the meaning of
the word to its mere embellishments, such as arts and sciences; but
the true distinction between it and barbarism is, that the one
presents a state of society under the protection of just and
well-administered law, and the other is left to the chance government
of brute force."
- The Rev. James White, Eighteen Christian Centuries, 1889
Key fingerprint = CE5C 6645 A45A 64E4 94C0  809C FFF6 4C48 4ECD DFDB
https://charlescurley.com