LLVM-SIZE(1)

💖 llvm-size — print size information 💖

okay bestie, pull up a chair, we're doing llvm-size from the LLVM fam and it's literally the glow-up of GNU's size. 🫶

✨ SYNOPSIS ✨

llvm-size [options] [input...]

🌸 DESCRIPTION 🌸

So llvm-size is that tool that prints size information for binary files, and no cap it's built to be a drop-in replacement for GNU's size. Same energy, better vibes. 💅

It prints size info for every input you hand it. And if you hand it nothing? Chill, it just prints size info for a.out. If you pass - as an input file, it reads a file straight from the standard input stream. And if one of your inputs is an archive? Obsessed — it displays size information for all of its members. every single one. periodt.

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👑 OPTIONS 👑

• -A — Equivalent to --format with a value of sysv.
• --arch=<arch> — Architecture(s) from Mach-O universal binaries to display information for.
• -B — Equivalent to --format with a value of berkeley.
• --common — Include ELF common symbol sizes in bss size for berkeley output format, or as a separate section entry for sysv output. If you don't specify it, those symbols just get ignored, bestie. 🙈
• --exclude-pagezero — Do not include the __PAGEZERO segment when calculating size information for Mach-O files. __PAGEZERO is a virtual memory region used for memory protection that does not contribute to actual size, so excluding it can give you a better representation of actual size. ✨
• -d — Equivalent to --radix with a value of 10.
• -l — Display verbose address and offset information for segments and sections in Mach-O files in darwin format.
• --format=<format> — Set the output format to the <format> you specify. Available <format> options are berkeley (the default), sysv and darwin.

Berkeley output summarises text, data and bss sizes in each file, like this for a typical pair of ELF files:

   $ llvm-size --format=berkeley test.o test2.o
      text    data     bss     dec     hex filename
       182      16       5     203      cb test.elf
        82       8       1      91      5b test2.o

For Mach-O files the output format is slightly different:

   $ llvm-size --format=berkeley macho.obj macho2.obj
   __TEXT  __DATA  __OBJC  others  dec     hex
   4       8       0       0       12      c       macho.obj
   16      32      0       0       48      30      macho2.obj

Sysv output displays size and address information for most sections, with each file listed separately:

   $ llvm-size --format=sysv test.elf test2.o
      test.elf  :
      section       size      addr
      .eh_frame       92   2097496
      .text           90   2101248
      .data           16   2105344
      .bss             5   2105360
      .comment       209         0
      Total          412

      test2.o  :
      section             size   addr
      .text                 26      0
      .data                  8      0
      .bss                   1      0
      .comment             106      0
      .note.GNU-stack        0      0
      .eh_frame             56      0
      .llvm_addrsig          2      0
      Total                199

darwin format only affects Mach-O input files. If you feed it an input of a different file format, llvm-size falls back to berkeley format. When producing darwin format, the tool displays information about segments and sections:

   $ llvm-size --format=darwin macho.obj macho2.obj
      macho.obj:
      Segment : 12
              Section (__TEXT, __text): 4
              Section (__DATA, __data): 8
              total 12
      total 12
      macho2.obj:
      Segment : 48
              Section (__TEXT, __text): 16
              Section (__DATA, __data): 32
              total 48
      total 48

• --help, -h — Display a summary of command line options.
• -m — Equivalent to --format with a value of darwin.
• -o — Equivalent to --radix with a value of 8.
• --radix=<value> — Display size information in the specified radix. Permitted values are 8, 10 (the default) and 16 for octal, decimal and hexadecimal output respectively.

Example:

   $ llvm-size --radix=8 test.o
      text    data     bss     oct     hex filename
      0152      04      04     162      72 test.o

   $ llvm-size --radix=10 test.o
      text    data     bss     dec     hex filename
       106       4       4     114      72 test.o

   $ llvm-size --radix=16 test.o
      text    data     bss     dec     hex filename
      0x6a     0x4     0x4     114      72 test.o

• --totals, -t — Applies only to berkeley output format. Display the totals for all listed fields, in addition to the individual file listings. slay.

Example:

   $ llvm-size --totals test.elf test2.o
      text    data     bss     dec     hex filename
       182      16       5     203      cb test.elf
        82       8       1      91      5b test2.o
       264      24       6     294     126 (TOTALS)

• --version — Display the version of the llvm-size executable.
• -x — Equivalent to --radix with a value of 16.
• @<FILE> — Read command-line options from response file <FILE>.

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🦋 EXIT STATUS 🦋

llvm-size exits with a non-zero exit code if there's an error. Otherwise? It exits with code 0. clean. ✨

💀 BUGS 💀

To report bugs, please visit <https://github.com/llvm/llvm-project/labels/tools:llvm-size/>. (yes bestie, go tell them, they wanna know 👑)

🎀 Author 🎀

Maintained by the LLVM Team (https://llvm.org/).

💜 Copyright 💜

2003-2026, LLVM Project

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and that's the whole page, no notes 🫶 this came out of the LLVM fam, dated 2026-07-16, and it's giving iconic. go print some sizes, you got this 💅✨🌸