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Musl: Difference between revisions

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* [[Chimera Linux]]
* [[Chimera Linux]]
* [[Void Linux]]
* [[Void Linux]]
The seL4 microkernel ships with musl, for binaries that have been linked against [[glibc]], [[gcompat]], glibmus-hq. can be used to execute them on musl-based distros.
The seL4 microkernel ships with musl, for binaries that have been linked against [[glibc]]. [[gcompat]] and glibmus-hq can be used to execute them on musl-based distros.
 
=== Comparisons between different C library implementations. ===
{| class="wikitable sortable"
|+
![[Bloat]] comparison
!musl
!uClibc
!dietlibc
![[glibc]]
|-
!Complete .a set
|426k
|500k
|120k
|2.0M †
|-
!Complete .so set
|527k
|560k
|185k
|7.9M †
|-
!Smallest static C program
|1.8k
|5k
|0.2k
|662k
|-
!Static hello (using printf)
|13k
|70k
|6k
|662k
|-
!Dynamic overhead (min. dirty)
|20k
|40k
|40k
|48k
|-
!Static overhead (min. dirty)
|8k
|12k
|8k
|28k
|-
!Static stdio overhead (min. dirty)
|8k
|24k
|16k
|36k
|-
!Configurable featureset
|no
|yes
|minimal
|minimal
|-
!Behavior on resource exhaustion
!musl
!uClibc
!dietlibc
![[glibc]]
|-
!Thread-local storage
|reports failure
|aborts
|n/a
|aborts
|-
!SIGEV_THREAD timers
|no failure
|n/a
|n/a
|lost overruns
|-
!pthread_cancel
|no failure
|aborts
|n/a
|aborts
|-
!regcomp and regexec
|reports failure
|crashes
|reports failure
|crashes
|-
!fnmatch
|no failure
|unknown
|no failure
|reports failure
|-
!printf family
|no failure
|no failure
|no failure
|reports failure
|-
!strtol family
|no failure
|no failure
|no failure
|no failure
|-
!Performance comparison
!musl
!uClibc
!dietlibc
![[glibc]]
|-
!Tiny allocation & free
|0.005
|0.004
|0.013
|0.002
|-
!Big allocation & free
|0.027
|0.018
|0.023
|0.016
|-
!Allocation contention, local
|0.048
|0.134
|0.393
|0.041
|-
!Allocation contention, shared
|0.050
|0.132
|0.394
|0.062
|-
!Zero-fill (memset)
|0.023
|0.048
|0.055
|0.012
|-
!String length (strlen)
|0.081
|0.098
|0.161
|0.048
|-
!Byte search (strchr)
|0.142
|0.243
|0.198
|0.028
|-
!Substring (strstr)
|0.057
|1.273
|1.030
|0.088
|-
!Thread creation/joining
|0.248
|0.126
|45.761
|0.142
|-
!Mutex lock/unlock
|0.042
|0.055
|0.785
|0.046
|-
!UTF-8 decode buffered
|0.073
|0.140
|0.257
|0.351
|-
!UTF-8 decode byte-by-byte
|0.153
|0.395
|0.236
|0.563
|-
!Stdio putc/getc
|0.270
|0.808
|7.791
|0.497
|-
!Stdio putc/getc unlocked
|0.200
|0.282
|0.269
|0.144
|-
!Regex compile
|0.058
|0.041
|0.014
|0.039
|-
!Regex search (a{25}b)
|0.188
|0.188
|0.967
|0.137
|-
!Self-exec (static linked)
|234µs
|245µs
|272µs
|457µs
|-
!Self-exec (dynamic linked)
|446µs
|590µs
|675µs
|864µs
|-
!ABI and versioning comparison
!musl
!uClibc
!dietlibc
![[glibc]]
|-
!Stable ABI
|yes
|no
|unofficially
|yes
|-
!LSB-compatible ABI
|incomplete
|no
|no
|yes
|-
!Backwards compatibility
|yes
|no
|unofficially
|yes
|-
!Forwards compatibility
|yes
|no
|unofficially
|no
|-
!Atomic upgrades
|yes
|no
|no
|no
|-
!Symbol versioning
|no
|no
|no
|yes
|-
!Algorithms comparison
!musl
!uClibc
!dietlibc
![[glibc]]
|-
!Substring search (strstr)
|twoway
|naive
|naive
|twoway
|-
!Regular expressions
|dfa
|dfa
|backtracking
|dfa
|-
!Sorting (qsort)
|smoothsort
|shellsort
|naive quicksort
|introsort
|-
!Allocator (malloc)
|musl-native
|dlmalloc
|diet-native
|ptmalloc
|-
!Features comparison
!musl
!uClibc
!dietlibc
![[glibc]]
|-
!Conformant printf
|yes
|yes
|no
|yes
|-
!Exact floating point printing
|yes
|no
|no
|yes
|-
!C99 math library
|yes
|partial
|no
|yes
|-
!C11 threads API
|yes
|no
|no
|no
|-
!C11 thread-local storage
|yes
|yes
|no
|yes
|-
!GCC libstdc++ compatibility
|yes
|yes
|no
|yes
|-
!POSIX threads
|yes
|yes, on most archs
|broken
|yes
|-
!POSIX process scheduling
|stub
|incorrect
|no
|incorrect
|-
!POSIX thread priority scheduling
|yes
|yes
|no
|yes
|-
!POSIX localedef
|no
|no
|no
|yes
|-
!Wide character interfaces
|yes
|yes
|minimal
|yes
|-
!Legacy 8-bit codepages
|no
|yes
|minimal
|slow, via gconv
|-
!Legacy CJK encodings
|no
|no
|no
|slow, via gconv
|-
!UTF-8 multibyte
|native; 100% conformant
|native; nonconformant
|dangerously nonconformant
|slow, via gconv; nonconformant
|-
!Iconv character conversions
|most major encodings
|mainly UTFs
|no
|the kitchen sink
|-
!Iconv transliteration extension
|no
|no
|no
|yes
|-
!Openwall-style TCB shadow
|yes
|no
|no
|no
|-
!Sun RPC, NIS
|no
|yes
|yes
|yes
|-
!Zoneinfo (advanced timezones)
|yes
|no
|yes
|yes
|-
!Gmon profiling
|no
|no
|yes
|yes
|-
!Debugging features
|no
|no
|no
|yes
|-
!Various Linux extensions
|yes
|yes
|partial
|yes
|-
!Target architectures comparison
!musl
!uClibc
!dietlibc
![[glibc]]
|-
!i386
|yes
|yes
|yes
|yes
|-
!x86_64
|yes
|yes
|yes
|yes
|-
!x86_64 x32 ABI (ILP32)
|experimental
|no
|no
|non-conforming
|-
!ARM
|yes
|yes
|yes
|yes
|-
!Aarch64 (64-bit ARM)
|yes
|no
|no
|yes
|-
!MIPS
|yes
|yes
|yes
|yes
|-
!SuperH
|yes
|yes
|no
|yes
|-
!Microblaze
|yes
|partial
|no
|yes
|-
!PowerPC (32- and 64-bit)
|yes
|yes
|yes
|yes
|-
!Sparc
|no
|yes
|yes
|yes
|-
!Alpha
|no
|yes
|yes
|yes
|-
!S/390 (32-bit)
|no
|no
|yes
|yes
|-
!S/390x (64-bit)
|yes
|no
|yes
|yes
|-
!OpenRISC 1000 (or1k)
|yes
|no
|no
|not upstream
|-
!Motorola 680x0 (m68k)
|yes
|yes
|no
|yes
|-
!MMU-less microcontrollers
|yes, elf/fdpic
|yes, bflt
|no
|no
|-
!Build environment comparison
!musl
!uClibc
!dietlibc
![[glibc]]
|-
!Legacy-code-friendly headers
|partial
|yes
|no
|yes
|-
!Lightweight headers
|yes
|no
|yes
|no
|-
!Usable without native toolchain
|yes
|no
|yes
|no
|-
!Respect for C namespace
|yes
|LFS64 problems
|no
|LFS64 problems
|-
!Respect for POSIX namespace
|yes
|LFS64 problems
|no
|LFS64 problems
|-
!Security/hardening comparison
!musl
!uClibc
!dietlibc
![[glibc]]
|-
!Attention to corner cases
|yes
|yes
|no
|too much malloc
|-
!Safe UTF-8 decoder
|yes
|yes
|no
|yes
|-
!Avoids superlinear big-O's
|yes
|sometimes
|no
|yes
|-
!Stack smashing protection
|yes
|yes
|no
|yes
|-
!Heap corruption detection
|yes
|no
|no
|yes
|-
!Misc. comparisons
!musl
!uClibc
!dietlibc
![[glibc]]
|-
!License
|MIT
|LGPL 2.1
|GPL 2
|LGPL 2.1+ w/exceptions
|}
Official benchmarks <ref>Etalabs [https://www.etalabs.net/compare_libcs.html]https://www.etalabs.net/compare_libcs.html</ref>


=== See also ===
=== See also ===
Line 653: Line 36:
* [[uClibc]]
* [[uClibc]]


==Notes==
[[Category:Software]]
<references />

Latest revision as of 05:30, 15 November 2024

musl

musl

musl ldd command output.
Release Status Maintained
Last Release 1.2.5 (2024-02-29, commit[1])
Language(s) C
Developer(s) Rich Felker (dalias) and others
Website musl.libc.org

musl is a C standard library intended for operating systems based on the Linux kernel, released under the MIT License. It was developed by Rich Felker to write a clean, efficient, and standards-conformant libc implementation.

Usage on Operating Systems

Linux distributions which use musl as their standard C library (some use only musl) include but are not limited to:

The seL4 microkernel ships with musl, for binaries that have been linked against glibc. gcompat and glibmus-hq can be used to execute them on musl-based distros.

See also

Retrieved from "https://atl.wiki/index.php?title=Musl&oldid=1295"