llvm-size1

Print size information

Usage

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

Overview

llvm-size is a tool that prints size information for binary files. It is intended to be a drop-in replacement for GNU's size.

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.

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.

--exclude-pagezero: Do not include the __PAGEZERO segment when calculating size information for Mach-O files. The __PAGEZERO segment is a virtual memory region used for memory protection that does not contribute to actual size, and excluding can provide 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> 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.

Releases

5 releases since Debian 10 (Buster); the text changed 4 times.

10
11
12
13
Arch

--arch since Arch Linux 2026-11-01; --common since Debian 12 (Bookworm); --exclude-pagezero since Arch Linux 2026-11-01; --format since Arch Linux 2026-11-01; --help since Debian 12 (Bookworm); --radix since Debian 12 (Bookworm); --totals since Debian 12 (Bookworm); --version since Debian 12 (Bookworm); -A since Debian 12 (Bookworm); -B since Debian 12 (Bookworm); -d since Debian 12 (Bookworm); -h since Debian 12 (Bookworm); -l since Debian 12 (Bookworm); -m since Debian 12 (Bookworm); -o since Debian 12 (Bookworm); -t since Debian 12 (Bookworm); -x since Debian 12 (Bookworm).