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Mail Archives: djgpp/2002/04/15/11:30:01

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Date: Mon, 15 Apr 2002 11:29:55 -0400
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From: DJ Delorie <dj AT delorie DOT com>
To: djgpp AT delorie DOT com
In-reply-to: <a9eqki$9s9$1@violet.singnet.com.sg> (gohyongkwang@hotmail.com)
Subject: Re: Creating small-sized EXE
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The FAQ has an entry on "Why are DJGPP .exe files so large?"  Based on
that, I get these file sizes with gcc 3.0.4:

#include <stdio.h>
main()
{
  printf("Hello World\n");
  return 0;
}

> gcc hello.c
111,384 hello.exe
> strip hello.exe
 51,606
> gcc -O2 hello.c
 97,241
> strip hello.exe
 43,926

The C library info files have an entire category for "startup functions"
that tell you how to reduce the size of your code:

#include <stdio.h>
__crt0_glob_function() { return 0; }
__crt0_load_environment_file() {}
__ctrO_setup_arguments() {}
main()
{
  printf("Hello World\n");
  return 0;
}

> gcc hello.c
 95,089
> strip hello.exe
 43,414
> gcc -O2 hello.c
 80,946
> strip hello.exe
 35,734

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