Make std lib detection a bit more lightweight #40
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…stddef is enough to detect BOOST_STDLIB_CONFIG. Backup to <utility> (which has become heavier in C++11) if std lib has not been detected.
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My only concern about this is that we might not correctly detect replacement libraries - for example STLPort or libc++ which are sitting on top of something else - by which I mean if including doesn't detect STLPort (for example) but does detect the underlying library then we go badly wrong. |
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Currently STLport is detected only including cstddef so the patch does not change this detection. libc++'s initial SVN import: http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/cstddef?revision=103490&view=markup shows that <__config> is included and it should be detected by the patch. I can't speak for other STLs. |
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OK, I applied a slightly different fix d978d31 |
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Great. Thanks John! |
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Update, issue: #58 reintroduces a dependency on and we're trying to figure out what to do about it :( |
...on environments where cstddef is enough to detect BOOST_STDLIB_CONFIG. Backup to
<utility>(which has become heavier in C++11, as it needs traits for move_if_noexcept..) if std lib has not been detected.The patch splits the detection in an auxiliary header and includes it twice in case cstddef is not enough.