> Date: Sat, 1 Jul 2023 06:57:40 -0700 > From: Jason Thorpe <thor...@me.com> > > Oh look, the entirety of jemalloc seems to be included in the > binary. WTF knows why that's happening, but apparently it is, and > jemalloc pulls in a ton of additional stuff.
Comes in from at least two different things: 1. jemalloc.c defines a constructor which brings in most of jemalloc. 2. csu/common/crt0-common.c calls atexit, which brings in libc/stdlib/atexit.c, which calls malloc. For a statically linked program that doesn't use malloc, these aren't necessary: we don't need the jemalloc constructor, and the crt exit handlers calls could be served by a static-only __atexit that atexit also uses to wire up to dynamic exit handlers. But someone would have to do the work to make this happen. Not 100% sure this covers everything -- easy to test kicking out atexit.c by defining __cxa_finalize, __cxa_atexit, __libc_atexit_init, and atexit in your .c file; not sure offhand how to kick out the jemalloc constructor without building a new libc.
