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gabor@google.com f57e23351f Platform detection during build, plus compatibility patches for machines without <cstdatomic>. This revision adds two major changes: 1. build_detect_platform which generates build_config.mk with platform-dependent flags for the build process 2. /port/atomic_pointer.h with anAtomicPointerimplementation for platforms without <cstdatomic> Some of this code is loosely based on patches submitted to the LevelDB mailing list at https://groups.google.com/forum/#!forum/leveldb Tip of the hat to Dave Smith and Edouard A, who both sent patches. The presence of Snappy (http://code.google.com/p/snappy/) and cstdatomic are now both detected in the build_detect_platform script (1.) which gets executing during make. For (2.), instead of broadly importing atomicops_* from Chromium or the Google performance tools, we chose to just implement AtomicPointer and the limited atomic load and store operations it needs. This resulted in much less code and fewer files - everything is contained in atomic_pointer.h. git-svn-id: https://leveldb.googlecode.com/svn/trunk@34 62dab493-f737-651d-591e-8d6aee1b9529		vor 13 Jahren
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arena.cc	@20776309	vor 13 Jahren
arena.h	reverting disastrous MOE commit, returning to r21	vor 13 Jahren
arena_test.cc	reverting disastrous MOE commit, returning to r21	vor 13 Jahren
cache.cc	Platform detection during build, plus compatibility patches for machines without <cstdatomic>.	vor 13 Jahren
cache_test.cc	reverting disastrous MOE commit, returning to r21	vor 13 Jahren
coding.cc	@20776309	vor 13 Jahren
coding.h	reverting disastrous MOE commit, returning to r21	vor 13 Jahren
coding_test.cc	reverting disastrous MOE commit, returning to r21	vor 13 Jahren
comparator.cc	@20776309	vor 13 Jahren
crc32c.cc	reverting disastrous MOE commit, returning to r21	vor 13 Jahren
crc32c.h	reverting disastrous MOE commit, returning to r21	vor 13 Jahren
crc32c_test.cc	reverting disastrous MOE commit, returning to r21	vor 13 Jahren
env.cc	reverting disastrous MOE commit, returning to r21	vor 13 Jahren
env_chromium.cc	sync with upstream @ 21409451	vor 13 Jahren
env_posix.cc	sync with upstream @ 21409451	vor 13 Jahren
env_test.cc	reverting disastrous MOE commit, returning to r21	vor 13 Jahren
hash.cc	reverting disastrous MOE commit, returning to r21	vor 13 Jahren
hash.h	reverting disastrous MOE commit, returning to r21	vor 13 Jahren
histogram.cc	reverting disastrous MOE commit, returning to r21	vor 13 Jahren
histogram.h	reverting disastrous MOE commit, returning to r21	vor 13 Jahren
logging.cc	@20776309	vor 13 Jahren
logging.h	reverting disastrous MOE commit, returning to r21	vor 13 Jahren
mutexlock.h	reverting disastrous MOE commit, returning to r21	vor 13 Jahren
options.cc	@20776309	vor 13 Jahren
random.h	@20776309	vor 13 Jahren
status.cc	sync with upstream @ 21409451	vor 13 Jahren
testharness.cc	reverting disastrous MOE commit, returning to r21	vor 13 Jahren
testharness.h	reverting disastrous MOE commit, returning to r21	vor 13 Jahren
testutil.cc	reverting disastrous MOE commit, returning to r21	vor 13 Jahren
testutil.h	reverting disastrous MOE commit, returning to r21	vor 13 Jahren