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llvm-size - print size information


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


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.


Equivalent to --format with a value of sysv.

Architecture(s) from Mach-O universal binaries to display information for.

Equivalent to --format with a value of berkeley.

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.

Equivalent to --radix with a value of 10.

Display verbose address and offset information for segments and sections in Mach-O files in darwin 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

Segment : 12
Section (__TEXT, __text): 4
Section (__DATA, __data): 8
total 12
total 12
Segment : 48
Section (__TEXT, __text): 16
Section (__DATA, __data): 32
total 48
total 48

Display a summary of command line options.

Equivalent to --format with a value of darwin.

Equivalent to --radix with a value of 8.

Display size information in the specified radix. Permitted values are 8, 10 (the default) and 16 for octal, decimal and hexadecimal output respectively.


$ 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

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


$ 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)

Display the version of the llvm-size executable.

Equivalent to --radix with a value of 16.

Read command-line options from response file <FILE>.


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


To report bugs, please visit <>.


Maintained by the LLVM Team (


2003-2023, LLVM Project

2023-06-16 16