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Re: GCC compilation options [message #24156 is a reply to message #24153]

Tue, 29 December 2009 21:50

Zbych
Messages: 326
Registered: July 2009

Senior Member

luzr wrote on Tue, 29 December 2009 17:36

At least in Linux and BSD, it did not seem to result in any difference in binary size.

You will not see huge size reduction of big applications, because such applications use a lot of functions from u++, so there is almost nothing to remove.
The biggest difference is in small applications.
I've made simple MT tcp/ip server. Without --gc-sections size of application was ~1,5MB. After I added --gc-sections size decreased to 0,4MB. For me it is a huge difference.

Compilation results for some applications from u++ package:

Application	| size [B] without dead code removal	| size [B] with dead code removal	|	Size reduction
------------------------------------------------------------------------------------------------|----------------------
ide		|	5809896				|	5148244				|	11,4%
Gui01		|	1760072				|	1090132				|	38%
HomeBudget	|	3641508				|	2037696				|	44%

gcc version 4.4.1, all applications optimized for size.

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