Today, I helped gehmehgeh get UFO:AI building on FreeBSD. The original build error had very little to do with the true cause.


It started off as a compile error about Com_DPrintf() being declared twice. We traced this down to HARD_LINKED_CGAME not being seen by the preprocessor. We finally traced this down to ${TARGET_OS}-config.h (i.e. freebsd-config.h) not being hard-coded into config.h. (The file "freebsd-config.h" was generated by ./configure.)


# I'm attaching a patch to config.h to add freebsd as a build target platform.
# I'm attaching a second patch to config.h to #error out if compiling on an unsupported build target platform. Debugging the issue was interesting, but it's something that can be largely avoided. With this #error, the problem will be obvious.


I also have a suggestion. Couldn't ./configure just write directly to config.h, or to a hard-coded target-platform-config.h, or perhaps the preprocessor could auto-generate the correct *-config.h filename? If we could do that, this issue will just go away for future unexpected build target platforms.