From: Mihnea Balta <dark_lkml@mymail.ro>
To: japan <ngmnhat@yahoo.com>, gcc-help@gcc.gnu.org
Subject: Re: I can't compile this program!
Date: Mon, 17 Feb 2003 16:02:00 -0000 [thread overview]
Message-ID: <200302171800.52857.dark_lkml@mymail.ro> (raw)
In-Reply-To: <20030217155852.59238.qmail@web11006.mail.yahoo.com>
On Monday 17 February 2003 17:58, japan wrote:
> Although I included math.h in the source code, why I must add -lm
> option when we compile one program using math functions???
>
> Ex: gcc -lm -o test test.c
>
> (test.c uses math functions and have already included math.h!)
>
> What libs we must link when compiling like that?
You included the header file, which contains the function prototypes,
#defines, etc. That's got nothing to do with the linker, which must be told
to link your code against the math library (libmath). The -lm flag tells it
to do that. Go learn the difference between a header and a shared library.
next prev parent reply other threads:[~2003-02-17 16:02 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-02-14 5:25 japan
2003-02-15 17:04 ` Jakub Ilski
2003-02-17 15:58 ` japan
2003-02-17 16:02 ` Mihnea Balta [this message]
2003-02-14 5:30 Ajay Bansal
2003-02-17 19:59 Dockeen
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