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On MSVC, log is an intrinsic that doesn't require libm. However, AC_SEARCH_LIBS does not successfully detect this, as it will try to compile a program using the wrong signature for log. Newer versions of MSVC CL detects this and rejects the program with the following messages: conftest.c(40): warning C4391: 'char log()': incorrect return type for intrinsic function, expected 'double' conftest.c(44): error C2168: 'log': too few actual parameters for intrinsic function Since log is always available on MSVC (it's been around since the dawn of time), we simply always assume it's there if MSVC is detected.
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 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: https://jemalloc.net/