Make sure asprintf() is declared if it's present.

GNU libc is a pain.  If you don't define _GNU_SOURCE, it doesn't declare
asprintf().  If you *do* define _GNU_SOURCE, the strerror_r() it
declares isn't POSIX-compliant.

We use asprintf() if present, so we need it to be declared; define
_GNU_SOURCE in ftmacros.h.

At configuration time, if we have strerror_r(), check whether it's
GNU-style or POSIX-style, and define different #defines for those two
cases.  Handle GNU-style strerror_r() and POSIX-style strerror_r()
differently in pcap_fmt_errmsg_for_errno().

Make sure everything that uses asprintf() includes ftmacros.h before
including stdio.h.

1 files changed, 2 insertions, 0 deletions

diff --git a/pcap-new.c b/pcap-new.c
index 6b333e4e..2cce433c 100644
--- a/pcap-new.c
+++ b/pcap-new.c
@@ -35,6 +35,8 @@
 #include <config.h>
 #endif
 
+#include "ftmacros.h"
+
 /*
  * sockutils.h may include <crtdbg.h> on Windows, and pcap-int.h will
  * include portability.h, and portability.h, on Windows, expects that