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You left out a pretty relevant piece of information: the command used to
invoke the compiler. If your source is in a file called (or
hello.ccp or hello.cxx), then you can compile your source below with the

g++ -o hello

I suspect that you used "gcc -o hello". By default, gcc does not
link in the C++ runtime library. You could use gcc if you want to manually
specify the C++ runtime:

gcc -o hello -lstdc++

Hope that helps,

Rick Rankin

> -----Original Message-----
> From:
> []On Behalf Of Dave Braze
> Sent: Sunday, March 28, 1999 5:15 PM
> To:
> Subject:
> I am having problems compiling C++ programs with b20.1 on Windows 95 sr2.
> Since I am trying to use cygwin to learn C++ and unix style tools both, I
> don't have a good handle on the relevant terminology, but here it is.
> I can't compile a simple "hello world" program. Here it is:
>      #include  <iostream>
>      int main()
>      {
>        std::cout << "Hello world!\n";
>        exit(0);
>      }
> I get an error like this (sorry for the long line):
> c:\CYGNUS\CYGWIN-B20\H-I586-CYGWIN32\BIN\..\lib\gcc-lib\i586-cygwi
> n32\egcs-2.91.57\collect2.exe
> -o hello.exe -s
> c:\CYGNUS\CYGWIN-B20\H-I586-CYGWIN32\BIN\..\lib\gcc-lib\i586-cygwi
> n32\egcs-2.91.57\..\..\..\..\i586-cygwin32\lib\crt0.o
> -Lc:\CYGNUS\CYGWIN-B20\H-I586-CYGWIN32\BIN\..\lib\gcc-lib\i586-cyg
> win32\egcs-2.91.57
> -Lc:\CYGNUS\CYGWIN-B20\H-I586-CYGWIN32\BIN\..\lib\gcc-lib
> -L\cygnus\cygwin-b20\H-i586-cygwin32\lib\gcc-lib\i586-cygwin32\egc
> s-2.91.57
> -Lc:\CYGNUS\CYGWIN-B20\H-I586-CYGWIN32\BIN\..\lib\gcc-lib\i586-cyg
> win32\egcs-2.91.57\..\..\..\..\i586-cygwin32\lib
> -L\cygnus\cygwin-b20\H-i586-cygwin32\lib\gcc-lib\i586-cygwin32\egc
> s-2.91.57\..\..\..\..\i586-cygwin32\lib
> -Lc:\CYGNUS\CYGWIN-B20\H-I586-CYGWIN32\BIN\..\lib\gcc-lib\i586-cyg
> win32\egcs-2.91.57\..\..\..
> hello.o -lgcc -lcygwin -lkernel32 -ladvapi32 -lshell32 -lgcc
> hello.o(.text+0x1e) undefined reference to `cout'
> hello.o(.text+0x23) undefined reference to
> `ostream::operator<<(char
> const *)'
> collect2: ld returned 1 exit status
> make: *** [hello.exe] Error 1
> Incidently I have no problem compiling a 'c'  version of "hello world". It
> seems like the problem has to do with linking to the c++
> libraries, but I'm
> not sure where the problem might be in my installation. When I installed
> cygwin I accepted the default install directory. Also, the same
> error occurs
> whether I  use gcc from the command line, or use a trivial make
> file. I can't
> imagine that this should cause a problem, but I do have a version of djgpp
> installed on my system (poverty of imagination?).
> In any event, all help will be very much appreciated.
> -Dave Braze
> ____________________________________________________________________
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