Very Computer

Perhaps this question would be better off in a gnu group, but since I use the
Slackware distribution:
        I am trying to compile c++ programs, but they seem unable to find or
use the c include files like <stdio.h> and <math.h>. For C everything works fine.
Did I miss some setup things? Or what am I doing wrong? I do have the c++
libraries and include files installed ...

An example of what happens:
#include <math.h>
#include <stdio.h>

main(){
  float x;
  x = cos(3.14);
  printf("Hallo");

Quote:}

Compilation exited abnormally with code 1 at Sun Sep 25 13:40:34

Thanks for any help,
Peter

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Peter Tieleman

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[summary: missing C include files, has C++ files installed]

Make sure you install the C compiler, C libraries, and the package extralib.
Even if you only use C++, you still need all the vanilla C stuff.

Hope this works,
jafager

: Perhaps this question would be better off in a gnu group, but since I use the
: Slackware distribution:
:       I am trying to compile c++ programs, but they seem unable to find or
: use the c include files like <stdio.h> and <math.h>. For C everything works fine.
: Did I miss some setup things? Or what am I doing wrong? I do have the c++
: libraries and include files installed ...

: An example of what happens:
: #include <math.h>
: #include <stdio.h>

: main(){
:   float x;
:   x = cos(3.14);
:   printf("Hallo");
: }

: gcc -o test test.cc
: /tmp/cca041071.o: Undefined symbol _cos referenced from text segment

: Compilation exited abnormally with code 1 at Sun Sep 25 13:40:34

try:
gcc -o test test.cc -lm

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Have a good one,

-Mark
--
Mark J. Bobak
Application Developer
Truck Operations, Ford Motor Company

: An example of what happens:
: #include <math.h>
: #include <stdio.h>

: main(){
:   float x;
:   x = cos(3.14);
:   printf("Hallo");
: }
: gcc -o test test.cc
: /tmp/cca041071.o: Undefined symbol _cos referenced from text segment

Link with the maths library !! Add -lm to get gcc -o test test.cc -lm

gary...

Quote:>         I am trying to compile c++ programs, but they seem unable to find or
> use the c include files like <stdio.h> and <math.h>. For C everything works
>  fine.
> Did I miss some setup things? Or what am I doing wrong? I do have the c++
> libraries and include files installed ...

> An example of what happens:
> #include <math.h>
> #include <stdio.h>

> main(){
>   float x;
>   x = cos(3.14);
>   printf("Hallo");
> }

> gcc -o test test.cc
> /tmp/cca041071.o: Undefined symbol _cos referenced from text segment

You're not linking in the maths library. The -lm cures that. You shouldn't
have been able to compile the above as c or c++ without it. I'd also be
careful of calling your executable test. I've got Slackware 2 installed and,
if you do a man 1 test, you'll find the manpage for Gnu test. On my system,
that lives in /usr/bin, which was before my home directory in my path. Oh,
cos returns a double as well.   :-)

--
Steve Whorwood                     :Resurgam