Kefu Chai ff8d6a730b cmake: error out if rocksdb is incompatible w/ tcmalloc ... the commit d406f228 in gperf implements a c11 feature used by a recent change in rocksdb: 16e03882, which uses aligned_alloc(). and 16e03882 in rocksdb was merged after v5.7 was tagged, while 16e03882 in gperf was merged after v2.6.1 was tagged. because aligned_alloc() is not implemented by tcmalloc until the not-yet-released 2.6.2, if we call aligned_alloc() in an application linked against tcmalloc, what gets called will be the glibc's aligned_alloc(). but if we free() the memory chunk allocated by aligned_alloc(), the tcmalloc's implementation kicks in, then InvalidFree() is called, because the memory chunk being freed was allocated by tcmalloc. in short, "mixing allocators", quote from Dan Mick. in rocksdb, aligned_alloc() is used if _ISOC11_SOURCE is defined, this makes sense, because aligned_alloc() is a C11 function. we could avoid using it by not defining _ISOC11_SOURCE. but as long as _GNU_SOURCE is defined, glibc defines _ISOC11_SOURCE. and libstdc++ requires _GNU_SOURCE, because it uses a fair amount of GNU extensions. Fixes: http://tracker.ceph.com/issues/21422 Signed-off-by: Kefu Chai <kchai@redhat.com>		2017-09-20 10:23:16 +08:00
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modules	cmake: error out if rocksdb is incompatible w/ tcmalloc	2017-09-20 10:23:16 +08:00