Problem with math.h

Problem with math.h

[Blinder Pablo]

Dear GNU help desk:
                 While trying to compile an ANSI C source  code I
constantly get the 'Undeclared identifier' error for any math
function. The same source code compiled properly under a different
operating system (under strict ANSI).
        Both header files 'math.h' and 'bits/mathcalls.h' are present in
the include folder. What is wrong?

Thanks,

Pablo.

==================================================================
Pablo Blinder
<blinderp@bgumail.bgu.ac.il>
Shazar 25/8
Beer-Sheva (84894)
Israel
972-7-6472624 (lab)
972-7-6289235 (home)
972-54-583469 (cellular)
===================================================================

Re: Problem with math.h

[Alexandre Oliva]

On Feb 15, 2001, Blinder Pablo  <blinderp@bgumail.bgu.ac.il> wrote:

> What is wrong?

Ask Amos Bouskila :-)

-- 
Alexandre Oliva   Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer                  aoliva@{cygnus.com, redhat.com}
CS PhD student at IC-Unicamp        oliva@{lsd.ic.unicamp.br, gnu.org}
Free Software Evangelist    *Please* write to mailing lists, not to me

RE: Problem with math.h

[David Korn]

  Hi Pablo, Amos,

[ I assume you two guys know each other since you have email addresses in
the same domain and reported the same problem within a few moments of each
other! ]

>Dear GNU help desk:

  We're not really a help desk.  We're just subscribers to the mailing list.
Some people here are members of the Gcc development teams at Cygnus and
Code Sourcery, others are just amateur hackers or end users.  Still glad
to help, if we can.

>                 While trying to compile an ANSI C source  code I
>constantly get the 'Undeclared identifier' error for any math
>function. The same source code compiled properly under a different
>operating system (under strict ANSI).
>        Both header files 'math.h' and 'bits/mathcalls.h' are 
>present in
>the include folder. What is wrong?

  Good question, and not one that can be easily answered by taking a guess
from half-way round the planet.  Good bug reports should include full
details of the system you are using (what OS and CPU), which version of the
compiler you're using (the output from gcc -v tells you), the *exact* text
of the error message in question, the *exact* command line you used to start
the compiler with, and if at all possible a few lines of cut and paste from
the code showing where the error is.

  So give this test case a try:

------mtest.c--------------
#include <math.h>

int main(void)
{
double n;

  n = sqrt(2);
  return (int)n - 1;
}
----------------------------

 Cut and paste it into a file 'mtest.c' and try building it with the 
command line

 gcc -v mtest.c -o mtest

and capture the output into a text file.  Then post all the output back to
the list.  If that doesn't tell us enough, we'll also need to try

 gcc -v mtest.c -o mtest.i -E

to have a look at the pre-processed source code.

     cheers,
        DaveK
-- 
we are not seats or eyeballs or end users or consumers.
we are human beings - and our reach exceeds your grasp.
                    deal with it.                      - cluetrain.org 


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Re: problem with math.h

[Alexandre Oliva]

On Feb 15, 2001, Amos Bouskila <bouskila@bgumail.bgu.ac.il> wrote:

> Surpriseingly the same error appeares whit and without  the
> #include <math.h> in the header file.

math.h contains declarations, relevant at compile time.  The
definitions are in libm, required at link time.  It can be linked in
with the `-lm' switch.

-- 
Alexandre Oliva   Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer                  aoliva@{cygnus.com, redhat.com}
CS PhD student at IC-Unicamp        oliva@{lsd.ic.unicamp.br, gnu.org}
Free Software Evangelist    *Please* write to mailing lists, not to me

problem with math.h

[Amos Bouskila]

Dear gcc help desk:
			While trying to compile under gcc on a  linux (both on Red hat and
Suse) machine, all ANSI math functions causes an 'Undeclared identifier'
error. Surpriseingly the same error appeares whit and without  the
#include <math.h> in the header file. The same pice of code compiled
properly under a different operating system. What is wrong?

thanks !