LLVM-SIZE(1)

✨ NAME ✨

Okay bestie, welcome to LLVM-SIZE(1) — the manual for llvm-size, the tool that prints size information 💖

🌸 SYNOPSIS 🌸

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

💅 DESCRIPTION 💅

So llvm-size is literally the tool that prints size information for binary files. It is intended to be a drop-in replacement for GNU's size, no cap 🫶

The tool prints size information for each input specified. If no input is specified, the program prints size information for a.out. If - is specified as an input file, llvm-size reads a file from the standard input stream. If an input is an archive, size information will be displayed for all its members 💖

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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 not specified, these symbols are ignored.
• -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> specified. Available <format> options are berkeley (the default), sysv and darwin.

Berkeley output summarises text, data and bss sizes in each file, as shown below 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 being 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 an input of a different file format is specified, 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.

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>.

🔥 EXIT STATUS 🔥

llvm-size exits with a non-zero exit code if there is an error. Otherwise, it exits with code 0. periodt 💅

🐛 BUGS 🐛

To report bugs, please visit <https://github.com/llvm/llvm-project/labels/tools:llvm-size/> 🫶

👑 AUTHOR 👑

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

🌈 COPYRIGHT 🌈

2003-2025, LLVM Project 💜

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and that's the whole LLVM-SIZE(1) manual, bestie — page 19 of the LLVM manual, dated 2025-01-17. mwah 💋