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Author Message
 Shared libraries and global variables
I have a shared library that has a global variable and a funtion that
references that variable:


int g_var = 0;

void f1(void)
   if (g_var)
     // do something

Then I have an executable that links in the shared library, and
updates the global variable:


extern int g_var;

int main(void)
   g_var = 1;

When I'm inside main(), my de{*filter*} (gdb) tells me that g_var is
indeed equal to 1 before the call to fl().  &g_var contains
0x81823820. When I'm inside fl(), however, gdb tells me that g_var is
0!  When I ask gdb to display &g_var, it gives me 0x450340F0!  Why are
there two different versions of g_var!?!?!?  And how do I fix this?

 Tue, 19 Apr 2005 05:29:19 GMT   
 Shared libraries and global variables

Use pointers?

 Tue, 19 Apr 2005 13:00:02 GMT   
 Shared libraries and global variables

It appears to be a bug in gdb!  If I single-step through the code, it
functions correctly.  I'm using gdb 5.1.90CVS-5 on Red Hat 7.3.

 Tue, 19 Apr 2005 23:39:48 GMT   
   [ 3 post ] 

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