Litte question about the Library

homerzhou · 09-20-2012, 03:41 AM

I often can't confirm that what the Library I should Link with the Header File.
For example, I use the Header File ---mysql.h ,I don't know which library I should link . However I can search the Internet to know the answer, I want to know how I can get the explicit location of Library from the Header File.

tronayne · 09-20-2012, 08:07 AM

In the specific case of MySQL, you would look in the MySQL Reference Manual in the Connectors and API section which shows example code and details the required header file for compiling and librar[y|ies] for linking.

In other cases, the manual page for a given function will include librar[y|ies) to be included; e.g., if you were to use the atan() function, the manual page for that function includes

Quote:

NAME
atan, atanf, atanl - arc tangent function

SYNOPSIS
#include <math.h>

double atan(double x);
float atanf(float x);
long double atanl( long double x);

Link with -lm.

Hope this helps some.

pan64 · 09-20-2012, 08:10 AM

you can use the command nm to check if a library contained the given function (not the header, but the function you use from that header)

Guttorm · 09-20-2012, 09:03 AM

Hi

On Debian-based distros you can also use "apt-file". I don't know if there's anything similar for RPM.