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Old 10-05-2010, 12:52 PM   #1
gerry_bertier
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problem regarding executing c program in ubuntu


Hi,

i am a newbie in linux.
i have a c program which runs on linux....so i installed ubuntu 10.04 version on my system.

i tried to compile this program 'mygen.c' (using gcc -o mygen.c) but i was given some errors -

mygen.c.text+0x4fe): undefined reference to `exp'
mygen.c.text+0x569): undefined reference to `sqrt'
mygen.c.text+0x57a): undefined reference to `log'
mygen.c.text+0x5b9): undefined reference to `tan'
mygen.c.text+0x5e9): undefined reference to `floor'
mygen.c.text+0x631): undefined reference to `exp'
collect2: ld returned 1 exit status

i thought that maybe 'math.h' is missing.
so, i checked the folder /usr/include and it do contains the file 'math.h'.
but this math.h do not have anything related to 'exp','sqrt' or some other math functions.

i downloaded a new header file 'math.h' from internet.
i tried to save it in the folder /usr/include but i could not.
i don't have the permission to paste the header file in /usr/include.
i am the administrator then why don't i have the required permission to paste that file ?
i tried with the commands to change the permission for this folder...but met no success.

i would be more than happy if u could sort out my problem.

thanx in advace.
 
Old 10-05-2010, 01:01 PM   #2
GrapefruiTgirl
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I believe the header file you're looking for is tgmath.h and that it *might* not be on your Ubuntu machine by default. You need to install at least one additional package of stuff, before you can compile. The following command should help:
Code:
sudo apt-get install build-essential
EDIT On second look, I may have spoken before reading thoroughly; disregard this and try the next post first.

Last edited by GrapefruiTgirl; 10-05-2010 at 01:22 PM.
 
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Old 10-05-2010, 01:01 PM   #3
Tinkster
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hi, welcome to LQ!

That's a linker problem, not a compiler one. Just bind
the math library to your executable.

Code:
-lm
Cheers,
Tink

Last edited by Tinkster; 10-05-2010 at 01:02 PM.
 
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Old 10-05-2010, 01:07 PM   #4
GrapefruiTgirl
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Thanks Tink - So are the headers are all there by default on Ubuntu? I thought they were not included?
 
Old 10-05-2010, 01:59 PM   #5
Tinkster
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Quote:
Originally Posted by GrapefruiTgirl View Post
Thanks Tink - So are the headers are all there by default on Ubuntu? I thought they were not included?
Don't know about Ubunut and its defaults - but if it were
a header problem he'd see compiler errors, not linker ones.
"Undefined reference" is clearly a linker error.



Cheers,
Tink
 
Old 10-05-2010, 02:14 PM   #6
GrapefruiTgirl
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Yes, OP's post is similar to an earlier post and I wasn't paying attention when I read it. I'm going back to sleep now.
 
Old 10-15-2010, 07:44 AM   #7
gerry_bertier
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thank you everyone....
my problem is solved....
 
  


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