When mac integration or binary relocation are disabled, the compiled
object file contains no symbols because the guards in the source files
hide all code. On OS X there's a warning during compilation saying:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib:
file: .libs/libgeany.a(libgeany_la-prefix.o) has no symbols
If these features are disabled, don't compile the corresponding
sources to avoid the warnings.
Interestingly, waf compilation works without warnings - it appears
linking is done through g++ which doesn't produce these warnings.
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