Question

I want to use hash tables in my c program.

I code:

...
#include <glib.h>

void main(int argc, char **argv)
{
  GHashTable *g_hash_table;
  ...  
  g_hash_table = g_hash_table_new(g_int_hash, g_int_equal);
...
}

Then I compile:

$ gcc -I/usr/include/glib-2.0
-I/usr/lib/i386-linux-gnu/glib-2.0/include
-lglib-2.0 -o test test.c

or the same command:

$ gcc `pkg-config --cflags --libs glib-2.0` -o test test.c

but anyway the result is:

test.c: underfined reference to `g_int_equal`
test.c: underfined reference to `g_int_hash` 
test.c: underfined reference to `g_hash_table_new`
collect2: ld returned 1 exit status

Why I cant compile my program? I do wrong include of glib library?

Answer 1

You need to specify libraries in the command line after the source and object files that use them:

gcc test.c `pkg-config --cflags --libs glib-2.0` -o test