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Linux Systemhaus Herford
Code sizes
There are many sources on the web telling you how to write small C code.
But different versions of gcc produce different code sizes.
I made a small test with different gcc-versions:
- gcc 3.2.3 (exactly: "gcc (GCC) 3.2.3 20030502 (Red Hat Linux 3.2.3-54)")
- gcc 3.3.3 (exactly: "gcc (GCC) 3.3.3 20040412 (Red Hat Linux 3.3.3-7)")
- gcc 3.3.5 (exactly: "gcc (GCC) 3.3.6-hammer 20050117 (prerelease)")
- gcc 3.3.6 (original GNU code)
- gcc 3.4.6 (exactly: "gcc (GCC) 3.4.6 20060404 (Red Hat 3.4.6-3)")
- gcc 4.1.0 (exactly: "gcc (GCC) 4.1.0 20060304 (Red Hat 4.1.0-3)")
With each gcc I built the dietlibc-0.30
with standard dietlibc options/flags and got the following file sizes of bin-i386/dietlibc.a:
- gcc 3.2.3: 681214
- gcc 3.3.3: 631384
- gcc 3.3.5: 631336
- gcc 3.3.6: 631504
- gcc 3.4.6: 627568
- gcc 4.1.0: 627204
Then I used each compiled dietlibc with each gcc to compile some small tools.
The executables were stripped ("strip -s -R .note -R .comment").
The matrix values are the sums of the tools file sizes:
|
diet323 |
diet333 |
diet335 |
diet336 |
diet346 |
diet410 |
| gcc323 |
26300 |
24060 |
24140 |
24204 |
24172 |
26180 |
| gcc333 |
24108 |
23816 |
23904 |
23816 |
23940 |
25896 |
| gcc335 |
24120 |
23828 |
23916 |
23828 |
23952 |
25908 |
| gcc336 |
24280 |
24016 |
24112 |
24016 |
24176 |
26124 |
| gcc346 |
24172 |
23880 |
23968 |
23880 |
23972 |
25960 |
| gcc410 |
24356 |
24064 |
24152 |
24064 |
24188 |
26144 |
Short note about the old-fashioned gcc-2.95.3: The file sizes I got with it are even inferior to gcc-3.2.3
and nearly bad as gcc-4.1.0.
A last test shows file sizes when compiling a tool with gcc-3.4.6:
| diet -Os gcc -Os; strip |
3776 |
| diet -Os gcc -Os |
7358 |
| diet gcc -Os |
7418 |
| diet gcc -O2 |
7578 |
| gcc -Os |
7730 |
| gcc -O2 |
7854 |
| gcc -O2 -g |
13966 |
| gcc -Os -static |
550334 |
Last note: With sstrip or elftrunc (dietlibc contrib)
you can strip symbols and section headers from ELF executables to get smaller
files.
Copyright © 2004-2021 Frank W. Bergmann
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