Re: Using std::string leads to large size of executable

[Benjamin Kosnik <bkoz at redhat dot com>]

>1)
>#include <string>
>int main()
>{
>  std::string("a");
>  return 0;
>}
>
>lead to ~200k .exe file.

On linux:

%COMP.sh "-O2" string_size.cc

%ll a.out
-rwxrwxr-x    1 bkoz     bkoz          12K May 15 18:51 a.out*

Note the difference. Try to use shared libraries, if possible on your
platform. Then, try to eliminate unused debug info (in 3.4, not 3.3 or
3.2). 

>2)
>#include <vector>
>int main()
>{
>  std::vector <char> a;
>  return 0;
>}
>
>lead to ~50k .exe file.

%COMP.sh "-O2" vector_size.cc

%ll a.out
-rwxrwxr-x    1 bkoz     bkoz          12K May 15 18:53 a.out*

>I want to use std::string but it too exspensive with such size wasting. I
>have tried next compilers for first example and got:
>mingw-3.2: 200k
>mingw-3.2 with STLport: 89k
>bcc-5.5: 64k
>bcc-5.6: 62k

I have yet to run across smaller binaries than g++ 3.x and libstdc++ on
linux. Cygwin/mingw may have other issues, like the inability to deal
with weak: see if __GXX_WEAK__ is being defined on your platform. That
would explain the size issue.

>So IMHO subj depend on GNU GCC implementation of std::string.

I think it depends on many things, including debugging information,
compilation flags, object file format, etc.

-benjamin