Date: Mon, 25 May 92 17:17:11 +0300
From: tlehtone AT cs DOT Helsinki DOT FI (Tapio Lehtonen)
To: djgpp AT sun DOT soe DOT clarkson DOT edu
Subject: Problems
Status: O

The following program compiles but does not link.

--getopt.cc--
#include <getopt.h>
#include <stream.h>

int main (int argc, char* argv[]) {

    GetOpt getopt(argc, argv, "abc");
    int opt;
    opt=getopt();
    cout << "Opt on nyt " << opt << '\n';
}
--end of file---

--output of gcc -v  ----
Reading specs from c:/djgpp/lib/specs
gcc version 2.1
 c:/djgpp/bin/cpp.exe -lang-c++ -v -undef -D__GNUC__=2 -D__GNUG__=2 -D__cplusplus -Dunix -Di386 -D__unix__ -D__i386__ -D__unix -D__i386 -D__GO32__ -D__MSDOS__ -DGO32 -DMSDOS -noprecomp testgeto.cc /tmp/cc000042.i
GNU CPP version 2.1 (80386, BSD syntax)
 c:/djgpp/bin/cc1plus.exe /tmp/cc000042.i -quiet -dumpbase testgeto.cc -version -o /tmp/cc000042.s
GNU C++ version 2.1 (80386, BSD syntax) compiled by GNU C version 2.1.
 c:/djgpp/bin/as.exe -o testgeto.o /tmp/cc000042.s
 c:/djgpp/bin/ld.exe c:/djgpp/lib/crt0.o -Lc:/djgpp/lib/ -Lc:/djgpp/lib/ testgeto.o -lgcc -lc -lgcc
alloca.o: Undefined symbol _xmalloc referenced from text segment
--end of output----

Is it possible to use the class GetOpt somehow? 


Another problem concerns for loop.
--excerpt of code---- 
    cout << "Veikkaustietokanta tarkistuksen vuoksi\n\n";
    cout << "vfirst=" << vfirst << '\n';

/*This code writes veikkaaja=0x0 and segmentation violates.
    for (veikkaaja=vfirst; veikkaaja != NULL; veikkaaja=veikkaaja->next); {
        cout << "veikkaaja=" << veikkaaja << '\n';
        if (veikkaaja!=NULL) cout << "veikkaaja->next=" << veikkaaja->next << '\n';
        tulostaveikkaaja(cout, veikkaaja);
    }//endfor
*/
/*This while -version works OK*/
    veikkaaja=vfirst;
    while (veikkaaja != NULL) {
        cout << "veikkaaja=" << veikkaaja << '\n';
        if (veikkaaja!=NULL) cout << "veikkaaja->next=" << veikkaaja->next << '\n';
        tulostaveikkaaja(cout, veikkaaja);
        veikkaaja=veikkaaja->next;
    }
  
    cout << "\nOnnellinen voittaja on " << veiknimi << '\n';

--end excerpt---

Seems that the for-loop sets veikkaaja=NULL, but the equivalent while
version of the for construct works. 

Third problem is 387 emulation. Using djgpp 1.05 the following program
ran, but produced incorrect results. Using 2.1 produces segmentation
violation. Perhaps there is something wrong with some functions in
math.h, or the 387 emulation does not work perfectly.

--power.cc---
#include <iostream.h>
#include <math.h>

//extern float pow(float x, int i);
//extern float pow(float c, float y);
 
int main() {
    for (int i = 0; i<20; i++) cout << pow(2,i)
                                    << '\t'
                                    << pow((float) 2, (float) i)
                                    << '\n';
    
}
--end of file---
     
I have an IBM PS/2 model 80, DOS 4.

-- 
Tapio Lehtonen                        PHONE + 358 0 7084206    Room A417
Dept. Comp. Sci., Univ. of Helsinki   TELEX 122785 TSK SF  FAX 708 4441
Teollisuuskatu 23, SF-00510 Helsinki  INTERNET tlehtone AT cs DOT Helsinki DOT FI
Finland                               TLEHTONEN AT FINUH    HYLK::TLEHTONEN