gcc 2.95.3 linker problems

gcc 2.95.3 linker problems

[Jakob Bucher]

Dear gcc-experts,

I´m using the gcc 2.95.3 compiler on a use linux 8.0 system.

Normal c-programs run fine. However when I use math-functions as "exp", or "log" the linker claims unresolved reference.
The math.h header has been included and the libc-devel been loaded using Yast2.

In the libc the math-functions appear not to be available.

My question is where to find the library of the math-functions and how to persuade the linker to use it.

Your advice will be highly appreciated.

Best regards

	Jakob Bucher 

Re: gcc 2.95.3 linker problems

[Eljay Love-Jensen]

Hi Jakob,

GCC does not normally include the math LIBRARY (libm.a or libm.so), even if you've included the math HEADER (math.h).  This practice is fairly common amonst compiler vendors, so GCC is not doing something wonky or strange.

You have to include the math LIBRARY by putting -lm (dash ell em) on your GCC link or compile+link line.

e.g.:
gcc -o myfoo foo.c -lm

HTH,
--Eljay

Re: gcc 2.95.3 linker problems

[Ishwar Rattan]

Try to include math-library with -lm option at the end of command-line

gcc prog.c -lm

-ishwar


On Sat, 13 Sep 2003, Jakob Bucher wrote:

> Dear gcc-experts,
>
> I´m using the gcc 2.95.3 compiler on a use linux 8.0 system.
>
> Normal c-programs run fine. However when I use math-functions as "exp", or "log" the linker claims unresolved reference.
> The math.h header has been included and the libc-devel been loaded using Yast2.
>
> In the libc the math-functions appear not to be available.
>
> My question is where to find the library of the math-functions and how to persuade the linker to use it.
>
> Your advice will be highly appreciated.
>
> Best regards
>
> 	Jakob Bucher
>
>

gcc 2.95.3 linker problems

[Jakob Bucher]

Dear gcc-experts,

I´m using the gcc 2.95.3 compiler on a
suse linux 8.0 system.

Normal c-programs run fine. However when I use math-functions
as "exp", or "log" the linker claims unresolved     external funktion.

Putting  -lm  into the command line, as recommended results in  "command not found".
On -l with the complete path of the libc.a library the linker claims not to find the dataset, which is definitely available.

Your advice will be highly appreciated.

Best regards

	J. Bucher