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* [Bug c++/21287] New: Problems while compiling with some math functions.
@ 2005-04-29 17:26 sreevatsan at gmail dot com
2005-04-29 17:52 ` [Bug c++/21287] " pcarlini at suse dot de
0 siblings, 1 reply; 2+ messages in thread
From: sreevatsan at gmail dot com @ 2005-04-29 17:26 UTC (permalink / raw)
To: gcc-bugs
I am trying to complie a simple program with math functions sqrt() and fabs
using gcc 3.4.3 (Red Hat 3.4.3-9.EL4). I am not able to compile without
including #include <math.h> but same code works with earlier versions of gcc
3.3.3 (Suse ) and gcc 3.3.3 (Red Hat 3.2.3-42).
Code:
#include<iostream.h>
int main()
{
double k =1.4;
cout<<sqrt(k)<<endl;
cout<<fabs(k)<<endl;
return 1;
}
Compilation command: g++ -o main main.cpp -w
Error:
main.cpp: In function `int main()':
main.cpp:5: error: `sqrt' undeclared (first use this function)
main.cpp:5: error: (Each undeclared identifier is reported only once for each
function it appears in.)
main.cpp:6: error: `fabs' undeclared (first use this function)
I have a large piece of software that have code in this manner i.e, using math
functions without including #include<math.h> and would like to migrate to gcc 3.4.3.
Please do advice.
Thanks,
--
Summary: Problems while compiling with some math functions.
Product: gcc
Version: 3.4.3
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: sreevatsan at gmail dot com
CC: gcc-bugs at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21287
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug c++/21287] Problems while compiling with some math functions.
2005-04-29 17:26 [Bug c++/21287] New: Problems while compiling with some math functions sreevatsan at gmail dot com
@ 2005-04-29 17:52 ` pcarlini at suse dot de
0 siblings, 0 replies; 2+ messages in thread
From: pcarlini at suse dot de @ 2005-04-29 17:52 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pcarlini at suse dot de 2005-04-29 17:52 -------
Really, you have to include math.h: the ISO Standard that we are implementing
is *very* clear about that, sorry. Much better, please move to <iostream> and
<cmath> in namespace std:: take seriously the warning! Thanks.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution| |INVALID
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21287
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2005-04-29 17:26 [Bug c++/21287] New: Problems while compiling with some math functions sreevatsan at gmail dot com
2005-04-29 17:52 ` [Bug c++/21287] " pcarlini at suse dot de
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