Issue #21085: add configure check for siginfo_t.si_band
Patch by Masayuki Yamamoto, reviewed and rebased by Erik Bray.
This is a first step on the long road toward resupporting Cygwin, which does
not provide siginfo_t.si_band.
diff --git a/configure b/configure
index 860135b..cff8683 100755
--- a/configure
+++ b/configure
@@ -13089,6 +13089,18 @@
fi
+# Issue #21085: In Cygwin, siginfo_t does not have si_band field.
+ac_fn_c_check_member "$LINENO" "siginfo_t" "si_band" "ac_cv_member_siginfo_t_si_band" "#include <signal.h>
+"
+if test "x$ac_cv_member_siginfo_t_si_band" = xyes; then :
+
+cat >>confdefs.h <<_ACEOF
+#define HAVE_SIGINFO_T_SI_BAND 1
+_ACEOF
+
+
+fi
+
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for time.h that defines altzone" >&5
$as_echo_n "checking for time.h that defines altzone... " >&6; }