gcc questions

[Mike McCarty]

Dotan Cohen wrote:
> On 11/27/05, Matthew Miller <mattdm at mattdm.org> wrote:
> 
>>On Sun, Nov 27, 2005 at 12:57:29AM +0200, Dotan Cohen wrote:
>>
>>>>gcc -lm 1_3.c
>>>
>>>Thank you, it compiled now. I just spacebar'ed about 100 times in the
>>>gcc man page looking for the "m" option that you mention. I did find
>>>the "l" option (search the library named library when linking), but
>>>not the "m" option.
>>
>>Right -- "m" isn't an option, but actually the name of the library. Well,
>>actually, the library is "libm.so", but the -l assumes a prefix of lib and a
>>suffix of .so.
>>
> 
> 
> Why doesn't it include the math library when I put at the top of the file:
> # include <math.h>

The answer to this is that there is no "it". Creating a program
involves several steps. It may seem like you are doing one thing,
but really you are not. The "include" directive communicates with
the preprocessor (or compiler depending on how it is structured),
while the "-lm" communicates with the linker, which is
normally a completely separate program.

Mike
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