Improve handling of C++.

autotools:

Determine the size of a void *; we don't use it now except for the
following test, but we will be using it in the future to determine
whether we're doing a 32-bit or 64-bit build, so that we can bludgeon
pkg-config into finding the right versions of libraries.

Check to make sure that the C and C++ compiler don't generate code for
different data models; if they do, it means we can't build C and C++
code and combine them, and also means that CMAKE_SIZEOF_VOID_P won't
"reflect reality" because there's no single reality to reflect, and we
won't be able to use it to determine whether we're doing a 32-bit or
64-bit build (which we may have to do in the future to make pkg-config
work correctly on some platforms).  There's unlikely to be a mismatch in
Haiku, but we do this anyway for future-proofing.

CMake:

Only check for a C++ compiler on Haiku.

Check to make sure that the C and C++ compilers don't generate code for
different data models.

This is a first step for issue #1112.

(cherry picked from commit 914e40f62f3382256cc27d5e171661f92f840f81)

1 files changed, 6 insertions, 0 deletions

diff --git a/config.h.in b/config.h.in
index a7e2ee31..47afb7b0 100644
--- a/config.h.in
+++ b/config.h.in
@@ -322,6 +322,12 @@
 /* target host supports RDMA sniffing */
 #undef PCAP_SUPPORT_RDMASNIFF
 
+/* The size of `const void *', as computed by sizeof. */
+#undef SIZEOF_CONST_VOID_P
+
+/* The size of `void *', as computed by sizeof. */
+#undef SIZEOF_VOID_P
+
 /* Define to 1 if you have the ANSI C header files. */
 #undef STDC_HEADERS