Blog/content/posts/2022/c/detect-musl.md

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2022-07-31 16:03:57 +03:00
---
title: "Detect Musl"
date: 2022-07-31T16:00:15+03:00
draft: false
tags: [linux, c, shell, musl]
---
Пост — чистейшая копипаста с [SoF](https://stackoverflow.com/questions/58177815/how-to-actually-detect-musl-libc).
```sh
#! /bin/sh
tmpf=/tmp/musl.log
# Detect Musl C library.
libc=$(ldd /bin/ls | grep 'musl' | head -1 | cut -d ' ' -f1)
if [ -z $libc ]; then
# This is not Musl.
rm -f ${tmpf}
exit 1
fi
$libc >${tmpf} 2>&1
vstr=$(cat ${tmpf} | grep "Version" | cut -d ' ' -f2)
v_major=$(echo $vstr | cut -d '.' -f1)
v_minor=$(echo $vstr | cut -d '.' -f2)
v_patch=$(echo $vstr | cut -d '.' -f3)
rm -f ${tmpf}
echo "-D__MUSL__ -D__MUSL_VER_MAJOR__=${v_major} -D__MUSL_VER_MINOR__=${v_minor} -D__MUSL_VER_PATCH__=${v_patch}"
```
```sh
$ ./detect-musl.sh
-D__MUSL__ -D__MUSL_VER_MAJOR__=1 -D__MUSL_VER_MINOR__=1 -D__MUSL_VER_PATCH__=24
```
```sh
$ /lib/ld-musl-x86_64.so.1
musl libc (x86_64)
Version 1.2.3
Dynamic Program Loader
Usage: /lib/ld-musl-x86_64.so.1 [options] [--] pathname [args]
```