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From:	Alex Vinokur <alexvn AT bigfoot DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	What does a program know of its optimization level?
Date:	Sun, 24 Feb 2002 15:46:43 +0200
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===============================================================
Windows98
gpp : GNU C++ version 2.95.3 20010315/djgpp (release) (djgpp)
      compiled by GNU C version 2.95.3 20010315/djgpp (release).
===============================================================

Here is some program.

// ----- C++-code : BEGIN -----

// File aaa.c

#include <iostream>

int main()
{
#ifdef __OPTIMIZE__
  cout << "Optimize = <" << __OPTIMIZE__ << ">" << endl;
#else
  cout << "Optimize = Not Defined" << endl;
#endif

  return 0;
}

// ----- C++-code : END -------



// ----- Compiling & Running : BEGIN -----
%gpp aaa.c
a.exe
Optimize = Not Defined

%gpp -O1 aaa.c
a.exe
Optimize = <1>

%gpp -O2 aaa.c
a.exe
Optimize = <1>

// ----- Compiling & Running : END -------


The program "knows" if it was compiled with optimization,
  however it doesn't know which level of optimization (O1, O2) was used.

Is there any possibility to know within a program
  which level of optimization was used?


  ===========================
  Alex Vinokur
    mailto:alexvn AT bigfoot DOT com
    mailto:alexvnw AT yahoo DOT com
    http://up.to/alexvn
    http://go.to/alexv_math
  ===========================

- Raw text -