Unable to build jemaloc using musl on Ubuntu aarch64

[bazhenov]

When trying to build jemalloc on aarch64 Ubuntu using musl, jemalloc could not determine appropriate atomic support.

Steps to reproduce:

# apt install musl-tools musl-dev
$ ./configure CC=aarch64-linux-musl-gcc
$ make
In file included from include/jemalloc/internal/jemalloc_internal_externs.h:5,
                 from include/jemalloc/internal/tsd_internals.h:11,
                 from include/jemalloc/internal/tsd_tls.h:7,
                 from include/jemalloc/internal/tsd.h:13,
                 from include/jemalloc/internal/ckh.h:5,
                 from include/jemalloc/internal/prof_structs.h:5,
                 from include/jemalloc/internal/jemalloc_internal_includes.h:51,
                 from src/jemalloc.c:2:
include/jemalloc/internal/atomic.h:22:4: error: #error "Don't have atomics implemented on this platform."
   22 | #  error "Don't have atomics implemented on this platform."
      |    ^~~~~

The problem, as far as I can understand, is that jemalloc configure script is not able to test atomic support. The following output is found in config.log

configure:14978: checking whether C11 atomics is compilable
configure:15008: aarch64-linux-musl-gcc -o conftest -std=gnu11 -Wall -Wextra -Wsign-compare -Wundef -Wno-format-zero-length -Wpointer-arith -Wno-missing-braces -Wno-missing-field-initializers -Wno
-missing-attributes -pipe -g3 -fvisibility=hidden -Wimplicit-fallthrough -Wdeprecated-declarations -O3 -funroll-loops -D_GNU_SOURCE -D_REENTRANT  conftest.c -pthread >&5
/usr/bin/ld: /usr/lib/gcc/aarch64-linux-gnu/14/libgcc.a(lse-init.o): in function `init_have_lse_atomics':
(.text.startup+0x10): undefined reference to `__getauxval'
collect2: error: ld returned 1 exit status

It seems like a problem with out-of-line atomics support. I've tried to disable it using -mno-outline-atomics and it works:

$ ./configure CC=aarch64-linux-musl-gcc CFLAGS=-mno-outline-atomics

Can I somehow build jemalloc on aarch64 using musl without specifying CFLAGS=-mno-outline-atomics?