C++ with gcc

C++ with gcc

[machrouh Youssef]

I try to compile C++ programs with the gcc version coming with the gnat
compiler (3.12p).

While compilation seems to work well, I got errors during linking.
When I compile the following program:

#include <iostream.h>

void main()
{

  cout<<"Quel est le prix HT ? : ";

}


I obtain the message:

gcc -v exo1.cpp
Reading specs from C:\GNAT\lib\gcc-lib\pentium-mingw32msv\2.8.1\specs
gcc version 2.8.1
 C:\GNAT\lib\gcc-lib\pentium-mingw32msv\2.8.1\cpp.exe -lang-c++ -v
-undef -D__GNUC__=2 -D__GNUG__=2 -D__cplusplus -D__GNUC_MINOR__=8 -Di386
-D_WIN32 -DWIN32 -D__WIN32__ -D__MINGW32__ -DWINNT -D_X86_=1
-D__STDC__=1 -D__stdcall=__attribute__((__stdcall__))
-D__cdecl=__attribute__((__cdecl__)) -D__i386__ -D_WIN32 -D__WIN32__
-D__WIN32__ -D__MINGW32__ -D__WINNT__ -D_X86_=1 -D__STDC__=1
-D__stdcall=__attribute__((__stdcall__))
-D__cdecl=__attribute__((__cdecl__)) -D__i386 -D__WIN32 -D__WINNT
-Asystem(winnt) -Acpu(i386) -Amachine(i386) -D__EXCEPTIONS -remap -Di386
-Di586 -Asystem(unix) -Acpu(i386) -Amachine(i386) -D__i386__ -D__i586__
-Asystem(unix) -Acpu(i386) -Amachine(i386) exo1.cpp C:\TEMP\cca00247.ii
GNU CPP version 2.8.1 (80386, BSD syntax)
#include "..." search starts here:
#include <...> search starts here:
 C:\GNAT\lib\gcc-lib\pentium-mingw32msv\2.8.1\include
 C:\GNAT\mingw32\include
End of search list.
 cc1plus C:\TEMP\cca00247.ii -quiet -dumpbase exo1.cc -version -o
C:\TEMP\cca00247.s
GNU C++ version 2.7.2.1 (80386, BSD syntax) compiled by GNU C version
2.7.2.1.
 as -o C:\TEMP\cca002471.o C:\TEMP\cca00247.s
 ld C:\GNAT\lib\crt2.o -LC:\GNAT\lib\gcc-lib\pentium-mingw32msv\2.8.1
-LC:\GNAT\lib -LC:\GNAT\lib C:\TEMP\cca002471.o -lmingw32 -lgcc
-lmoldname -lmsvcrt -lkernel32 -ladvapi32 -lshell32 -lmingw32 -lgcc
-lmoldname -lmsvcrt
C:\TEMP\cca002471.o(.text+0x28):exo1.cc: undefined reference to `cout'
C:\TEMP\cca002471.o(.text+0x2d):exo1.cc: undefined reference to
`ostream::operator<<(char const *)'

Compilation exited abnormally with code 1 at Fri Mar 24 15:02:49


I suspect that some library is not referenced correctly.

Could someone help me.

Re: C++ with gcc

[Robert Dewar]

In article <38DB7762.90530BAE@limsi.fr>,
  machrouh Youssef <machrouh@limsi.fr> wrote:
> I try to compile C++ programs with the gcc version coming with
> the gnat compiler (3.12p).

GNAT as distributed will not support g++. Any attempt to build
a combined version that handles both GNAT and g++ will fail
in one manner or another, since the two compilers currently
require different versions of gcc (in particular GNAT requires
a patched version of gcc 2.8.1 that has never been tested with
g++, and in fact it is known that g++ cannot be built with this
version of gcc).

We are working hard to merge the two versions of gcc, so this
is a problem which will disappear in the future (if you watch
the gcc mailing list, you will be very aware of the activity
in this area!)

Robert Dewar
Ada Core Technologies


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Re: C++ with gcc

[Gisle S�lensminde]

In article <38DB7762.90530BAE@limsi.fr>, machrouh Youssef wrote:
>I try to compile C++ programs with the gcc version coming with the gnat
>compiler (3.12p).
>
>While compilation seems to work well, I got errors during linking.
>When I compile the following program:
>
>#include <iostream.h>
>
>void main()
>{
>
>  cout<<"Quel est le prix HT ? : ";
>
>}

Since GNAT patches the gcc backend, and the impact on the c++ frontend
is untested, so it's recomended to have seperate installations of 
Ada and C++. Another reason to have two install two compilers, is that
GNAT is based on gcc 2.8.1 backend, but the latest version of g++ 
is based on gcc 2.95. The newer versions of g++ is much closer to the
standard than the C++ frontend of gcc 2.8.1. 

Besides from that it looks like you not have compiled the standard c++
library, or put it in the wrong place. I see you use mingwin on the
windows platform, and I have no experience in compiling gcc on windows,
so I can't help you there. 



--
Gisle S�lensminde ( gisle@ii.uib.no )   

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