Windows: Silence a spurious warning in the GetAdaptersAddresses cast

GetProcAddress() returns FARPROC, which is (long long int(*)()) on
64-bit Windows:
https://msdn.microsoft.com/en-us/library/windows/desktop/ms683212(v=vs.85).aspx

But GetAdaptersAddresses() is (long unsigned int(*)()), on both 32-bit
and 64-bit Windows:
https://docs.microsoft.com/en-us/windows/desktop/api/iphlpapi/nf-iphlpapi-getadaptersaddresses

So gcc 8 issues a spurious "incompatible function pointer" warning
about the cast to GetAdaptersAddresses_fn_t.

Silence this warning by casting to a void function pointer, before
the cast to GetAdaptersAddresses_fn_t.

This issue is already fixed by 26481 in 0.3.5 and later, by removing
the lookup and cast.

Fixes bug 27465; bugfix on 0.2.3.11-alpha.

1 files changed, 4 insertions, 1 deletions

diff --git a/src/common/address.c b/src/common/address.c
index 96b99fa082..794345a138 100644
--- a/src/common/address.c
+++ b/src/common/address.c
@@ -1492,7 +1492,10 @@ get_interface_addresses_win32(int severity, sa_family_t family)
     goto done;
   }
 
-  if (!(fn = (GetAdaptersAddresses_fn_t)
+  /* Cast through a void function pointer, to silence a spurious compiler
+   * warning on 64-bit Windows. This cast is safe, because we are casting to
+   * the correct type for GetAdaptersAddresses(). */
+  if (!(fn = (GetAdaptersAddresses_fn_t)(void(*)(void))
                   GetProcAddress(lib, "GetAdaptersAddresses"))) {
     log_fn(severity, LD_NET, "Unable to obtain pointer to "
            "GetAdaptersAddresses");