Richard W_M_ Jones commented:
There's actually a trick using `typeof` which avoids redefining each variable type (and it's more type safe). However I'm not sure if it requires a GCC extension or not. See example:
```
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <tss2/tss2_esys.h>
#include <dlfcn.h>
typeof(Esys_Initialize) (*my_Esys_Initialize);
typeof(Esys_Finalize) (*my_Esys_Finalize);
int
main ()
{
void *dl = dlopen ("libtss2-esys.so.0", RTLD_NOW);
assert (dl);
my_Esys_Initialize = dlsym (dl, "Esys_Initialize");
assert (my_Esys_Initialize);
my_Esys_Finalize = dlsym (dl, "Esys_Finalize");
assert (my_Esys_Finalize);
ESYS_CONTEXT *ctx;
if (my_Esys_Initialize (&ctx, NULL, NULL)) {
fprintf (stderr, "Esys_Initialize failed\n");
exit (1);
}
fprintf (stderr, "ctx = %p\n", ctx);
my_Esys_Finalize (&ctx);
exit (0);
}
```
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