[vox-tech] math.h advice?

[Peter Jay Salzman]

heh.  i knew someone was going to call me on that a second after i sent
that email.   :)

right, *declarations* of global variables.

in other words, the type of stuff that normally goes into your own
header files.

pete


begin Jeff Newmiller <jdnewmil@dcn.davis.ca.us> 
> On Mon, 8 Jul 2002, Peter Jay Salzman wrote:
> 
> > yes.
> > 
> > #including a file doesn't bring in code.  it brings in things like
> > prototypes, global variables, includes, defines, etc.
>               ^^^^^^^^^^^^^^^^
> 
> ... to be precise, the declarations of global variables.  The global
> variables themselves are also in the library, brought in with the "-lm".
> 
>    extern int myglobal;   /* declaration... exists somewhere.... */
>    int myglobal;          /* allocates space for the variable,
>                              normally only used in a .c file  */
> 
> > 
> > everything except the actual code.
> > 
> > -lm brings in the code.
> > 
> > pete
> > 
> > begin Alexandra Thorn <amthorn@ucdavis.edu> 
> > > 
> > > Mike,
> > > 
> > > Thanks for your suggestion.  Now just to confirm that I understand you,
> > > are you saying that I just just add the option -lm at the end of the
> > > compile command line line?
> > > 
> > > Thanks again,
> > > Alex
> > > 
> > > On Mon, 8 Jul 2002 msimons@moria.simons-clan.com wrote:
> > > 
> > > >   Add "-lm" to your gcc link line... that asks gcc to link in the math
> > > > library.  "-l" says link in the following library "m" is the name of the
> > > > math library.
> > > >
> > > >   So "gcc -o run_me infile.c -lm" should produce a run_me...
> > > >
> > > >   If not please paste the error messages you see.
> > > >
> > > >     Good Luck,
> > > >       Mike
> > > > _______________________________________________
> > > 
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