From: myknees AT aol DOT com (Myknees)
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Simple == Big
Date: 16 Oct 1997 01:07:09 GMT
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In article <Pine DOT SUN DOT 3 DOT 91 DOT 971014133514 DOT 14821B-100000 AT is>, Eli Zaretskii
<eliz AT is DOT elta DOT co DOT il> writes:

>No, it probably means that the options you set in RHIDE somehow don't get 
>to gcc.  I don't use RHIDE, so I won't know why that might happen, but it 
>seems like the simplest explanation to everything you report.
>
>Just to make sure that I'm right, try compiling your program from the DOS 
>prompt and see if -O3 and -s (lower-case) have any effect on the size of 
>the .exe file.  They should.
[snip]

Well, this thread is interesting even if it is overkill to worry so much
about little programs.  Just for the sake of curiousity, I followed up on
your suggestions and also got together some info on the type of results I
got with different switches & options.  The code I used is at the bottom
(and yes, it is unrealistically simple, but yes, I do use the resulting .exe!)

================================
Before each test, the c80.exe and c80.o files were
deleted.

From RHIDE1.4
no switches:            102,166
-O3 compiler option:    102,040
-O2 compiler option:    102,040

-O3 compiler +
-s linker options:       45,568

-O2 compiler +
-s linker options:       45,568

After running the djp compressor on the 46K
file, it was 28,864 bytes in size.


From the command line:
gcc c80.cc -O2 -s -o c80.exe
...resulted in a 45,568 byte .exe file, as did
gcc -o c80.exe -O3 -s c80.cc

(My first time using the command line, so might
not be right.)
===============================
/*
        The point of this prog is to set the textmode to
        C80 format. textmode() is in conio.h.
*/

#include <conio.h>
#include <crt0.h>

int main()
{
        textmode(C80);
        return 0;
}

/* The three following functions are supposed to turn
   off some of the overhead code (for dealing with
   command line arguments, etc. If I did it right!)
*/

__crt0_glob_function()
{
        return 0;
}

__crt0_load_environment_file()
{
        return 0;
}

__crt0_setup_arguments_function()
{
        return 0;
}