i.e. allow minetestmapper to query the database for a list of
blocks in a specific range (corresponding to the requested geometry),
instead of always obtaining a full list off all blocks.
As postgresql is the only database which supports this efficiently,
this option is only effective for postgresql.
<stream>.eof() may require the stream to be read (peeked) before giving the
correct result. But it can't be peeked if already at EOF - see below.
<stream>.peek() is not idempotent:
If the stream is at EOF, but not known to be, it sets eofbit.
However, if the stream is known to be at EOF, it sets the failbit :-(
Previously, the HTML documentation would be generated even if there were
warnings, and a subsequent build would consider the documentation
up-to-date.
It seems like CMake has no option to remove a (possibly partially generated!)
target if the command exits with a non-zero status...
INT64_MIN was causing problems ('not declared'), because C99 requires some
C++-specific behavior, which C++11 prohibits...
Comments from clang's stdint implementation (http://clang.llvm.org/doxygen/stdint_8h_source.html):
// C99 7.18.3 Limits of other integer types
//
// Footnote 219, 220: C++ implementations should define these macros only when
// __STDC_LIMIT_MACROS is defined before <stdint.h> is included.
//
// Footnote 222: C++ implementations should define these macros only when
// __STDC_CONSTANT_MACROS is defined before <stdint.h> is included.
//
// C++11 [cstdint.syn]p2:
//
// The macros defined by <cstdint> are provided unconditionally. In particular,
// the symbols __STDC_LIMIT_MACROS and __STDC_CONSTANT_MACROS (mentioned in
// footnotes 219, 220, and 222 in the C standard) play no role in C++.
//
// C11 removed the problematic footnotes.
When using --disable-blocklist-prefetch, the database key format for every leveldb
block, which is normally determined when prefetching the block list, is not known.
In order to avoid duplicate queries using both key formats, the key format can now
be specified using --database-format
This introduces a speed tradeoff.
When mapping a small part of a large world, the prefetch time dominates
the mapping time, and it is more advantageous to skip the prefetch and
query all possible blocks in the mapped space.
When mapping a large fraction of a world, in particular when a lot of
the mapped space is empty, the time spent querying non-existing blocks can
dominate mapping time, and it is more advantageous to prefetch the list
of existing blocks, so that querying huge numbers of non-existing blocks
can be avoided.
