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* Remove -fno-builtin. -fno-builtin suppresses optimizations such as turning calls to `sqrt` or `fabs` into `f64.sqrt` or `f64.abs` instructions inline. Libc code itself benefits from these optimizations. I originally added this flag because historically it was needed when building libc to avoid the compiler pattern-matching the body of memcpy into a memcpy call, however clang no longer requires this. * Expand the comment about why we use USE_DL_PREFIX in dlmalloc. |
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