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Get jemalloc building and passing `make check_unit` with cray 8.4. An inlining bug in 8.4 results in internal errors while trying to build jemalloc. This has already been reported and fixed for the 8.5 release. In order to work around the inlining bug, disable gnu compatibility and limit ipa optimizations. I copied the msvc compiler check for cray, but note that we perform the test even if we think we're using gcc because cray pretends to be gcc if `-hgnu` (which is enabled by default) is used. I couldn't come up with a principled way to check for the inlining bug, so instead I just checked compiler versions. The build had lots of warnings I need to address and cray doesn't support -MM or -MT for dependency tracking, so I had to do `make CC_MM=`.
jemalloc is a general purpose malloc(3) implementation that emphasizes fragmentation avoidance and scalable concurrency support. jemalloc first came into use as the FreeBSD libc allocator in 2005, and since then it has found its way into numerous applications that rely on its predictable behavior. In 2010 jemalloc development efforts broadened to include developer support features such as heap profiling, Valgrind integration, and extensive monitoring/tuning hooks. Modern jemalloc releases continue to be integrated back into FreeBSD, and therefore versatility remains critical. Ongoing development efforts trend toward making jemalloc among the best allocators for a broad range of demanding applications, and eliminating/mitigating weaknesses that have practical repercussions for real world applications. The COPYING file contains copyright and licensing information. The INSTALL file contains information on how to configure, build, and install jemalloc. The ChangeLog file contains a brief summary of changes for each release. URL: http://www.canonware.com/jemalloc/