Very Computer

by **Uwe Boss** » Tue, 19 Jun 2001 00:05:01

I want to check, whether a password given by a user is correct or not.
I found the following manpage for crypt:

#define _XOPEN_SOURCE
#include <unistd.h>

char *crypt(const char *key, const char *salt);

... and thought, this is, what I have been looking for.
Take the users password, crypt it and compare the result with the
contents of /etc/passwd.
But the following went wrong:
first g++ didn't find the header of crypt. After a look at unistd.h I
changed
#define _XOPEN_SOURCE into
#define __USE_XOPEN
Now, the compilation succeeded, but the linker told me:
undefined reference to 'crypt'.

What is my mistake?

by **Carlos Moren** » Tue, 19 Jun 2001 00:29:43

> Now, the compilation succeeded, but the linker told me:
> undefined reference to 'crypt'.

> What is my mistake?

Did you use the switch -lcrypt when compiling?

Carlos
--

by **Eugene Mayevsk** » Tue, 19 Jun 2001 01:01:26

Quote:> Now, the compilation succeeded, but the linker told me:
> undefined reference to 'crypt'.
> What is my mistake?

Add -lcrypt to compiler command line.

--
Sincerely yours,
Eugene Mayevski

by **Harley_..** » Wed, 20 Jun 2001 03:35:28

OUtstanding....
You guys have answered a question that has haunted me for weeks.
This newsgroup is awesome.

Thanks,
Kelvin

> > Now, the compilation succeeded, but the linker told me:
> > undefined reference to 'crypt'.
> > What is my mistake?

> Add -lcrypt to compiler command line.

> --
> Sincerely yours,
> Eugene Mayevski

by **Uwe Boss** » Wed, 20 Jun 2001 04:14:22

Quote:> Did you use the switch -lcrypt when compiling?

No, I didn't, and now it works. Thank you. (I'm really a beginner).

Very Computer

crypt() won't be found by the linker

crypt() won't be found by the linker

crypt() won't be found by the linker

crypt() won't be found by the linker

crypt() won't be found by the linker

crypt() won't be found by the linker