compile problems on Android ndk r16 beta 1 about filesystem

[berkus]

Xref https://svn.boost.org/trac10/ticket/13274

[pdimov]

See also android/ndk#518 and android/ndk#501

will be fixed in r16beta2.

[enh]

this bug can be closed: the released NDK added the missing defined() last year.

[alexeikh]

It should be noted that:

• This issue (#56) is about compilation failure of #include <cstdio> if _FILE_OFFSET_BITS=64 is defined.
• This issue (#56) should not be confused with issue #65, which is about compilation failure of BOOST_RESIZE_FILE(...) if _FILE_OFFSET_BITS=64 is defined.
• This issue (#56) is only fixed in Android NDK for libc++ (LLVM STL). If using libstdc++ (GNU STL), the issue remains.
• Issue #65 is not fixed yet. Android NDK developers' opinion is that it must be fixed in the Boost.Filesystem code.
• Pull request #69 aims to fix both issue #56 for GNU STL and issue #65.

I am publishing this information here, so that #65 and #69 will not be mistakenly closed as duplicates for this issue (#56).

[berkus]

@alexeikh libstdc++ is no longer supported in latest NDKs and is slated for removal. I don't think any significant work will be done to remedy this in libstdc++.