[Freeciv-Dev] detection of "inline" broken (PR#2104)

[jdorje@xxxxxxxxxxxxxxxxxxxxx]

I use Debian Sid.  My system:

+ checking for autoconf >= 2.52 ... found 2.54, ok.
+ checking for automake >= 1.4 ... found 1.5, ok.
+ checking for xgettext >= 0.10.36 ... found 0.11.5, ok.
+ checking for msgfmt >= 0.10.36 ... found 0.11.5, ok.

for some time now I have been unable to compile either GTK or GTK2 
clients.  I hadn't really looked into it since I figured it was a debian 
issue, but now I see otherwise.
It happens because config.h contains

  /* Define as `__inline' if that's what the C compiler calls it,
     or to nothing if it is not supported. */
  #define inline

which basically removes the ability to do inlining.  This breaks glib, 
whose header files include some "inline" functions and (the part that I 
think breaks) some custom code to properly #define "inline".
When I change the above to

  #define inline __inline

compilation works fine.

So the question is: why is inline incorrectly defined?

jason