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Different C++ compiler exec. sizes

Out of curiosity, I wanted to test executable file sizes of the same
program from different compilers...

The 2 compilers I tested (both old, on purpose) were Borland C++ 3.1
and DJGPP 2.03...

The program was nothing but a simple hello world program using the
iostream header file...

I compiled and linked (both copies) with those 2 different
compilers... The Borland c++ 3.1 compiler gave me an executable with
size like 20-30KB (i don't remember) and DJGPP gave me an executable
with size like 220-240KB...

I can assume 2 things here... Either DJGPP produces WAY more
compicated executables (kind of odd though) or DJGPP's header files
contain kinda different info....

Anyone seen anything like that? Anyone know why?
Jul 19 '05
11 6708

"Jerry Coffin" <jc*****@taeus. com> wrote in message news:MP******** *************** *@news.clspco.a delphia.net...
It starts to go wrong at fib(46). Here's a cut-n-paste of output:

Fib [44] = 701408733
Fib [45] = 1134903170
Fib [46] = 124406183631190 3
Fib [47] = 124406297121507 3
Fib [48] = 248812480752697 6
Fib [49] = 373218777874204 9
Fib [50] = 622031258626902 5
CPU time used : 0 sec

Anytime it gains more than one digit in an iteration, something's
clearly wrong...


Weird output.


* GNU gcc (Cygwin, Cygwin with STLport, Mingw, DJGPP : Optimization 0-3) and
* Digital Mars C++ compiler (No optimization, Space, Speed) .

All those executables generate the same (valid) output

$ fib.exe all 50
Fib [40] = 102334155
Fib [41] = 165580141
Fib [42] = 267914296
Fib [43] = 433494437
Fib [44] = 701408733
Fib [45] = 1134903170
Fib [46] = 1836311903
Fib [47] = 2971215073
Fib [48] = 4807526976
Fib [49] = 7778742049
Fib [50] = 12586269025
CPU time used : 0 sec
Unfortunaly I don't have Borland compiler. So, I am unable to analyze what is reason for that.

=============== =============== =======
Alex Vinokur
mailto:al****@c onnect.to
=============== =============== =======

Jul 19 '05 #11
In article <bo************ *@ID-79865.news.uni-berlin.de>,
al****@bigfoot. com says...

[ ... ]
Weird output.
Yes, to put it mildly.

* GNU gcc (Cygwin, Cygwin with STLport, Mingw, DJGPP : Optimization 0-3) and
* Digital Mars C++ compiler (No optimization, Space, Speed) .

All those executables generate the same (valid) output

In case you care, so do VC++ and Comeau (Ver. 7.1 and 4.3 respectively).


The universe is a figment of its own imagination.
Jul 19 '05 #12

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