[ale] gcc ques

[fletch at phydeaux.org (Fletch)]

>>>>> "John" == John J Cruz <casacruz at bellatlantic.net> writes:


[...]

    John> echo $PATH includes /usr/X11R6/lib

        PATH has to do with executing things, not compilation.

    John> I don't understand why gcc insist on looking in directory
    John> /usr/bin when the library in question is in /usr/X11R6/lib?
    John> For that matter how do I change gcc to look somewhere else?

        -L/usr/X11R6/lib

        man gcc and man ld

    John> The header file "includes <math.h> why should I have to add
    John> -lm to link with the math library?

        Including the header just provides the C prototypes for the
functions; it says nothing about linkage.  You've got to tell gcc to
pull in the math library.

        And yes, this can be a pain.  This is why you write a Makefile
or use automake and only type things out once.

-- 
Fletch                | "If you find my answers frightening,       __`'/|
fletch at phydeaux.org   |  Vincent, you should cease askin'          \ o.O'
770 933-0600 x211(w)  |  scary questions." -- Jules                =(___)=
770 294-0820 (m)      |                                               U

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