When configuring for 64-bit support, check that the

C library functions for casting floating point values
to 64-bit integer values are not broken.

p4raw-id: //depot/perl@22750

1 files changed, 57 insertions, 0 deletions

diff --git a/hints/openbsd.sh b/hints/openbsd.sh
index 51a75a9e63..b7f4d794e8 100644
--- a/hints/openbsd.sh
+++ b/hints/openbsd.sh
@@ -125,6 +125,63 @@ $define|true|[yY]*)
 esac
 EOCBU
 
+# This script UU/use64bitint.cbu will get 'called-back' by Configure 
+# after it has prompted the user for whether to use 64-bitness.
+cat > UU/use64bitint.cbu <<'EOCBU'
+case "$use64bitint" in
+$define|true|[yY]*)
+	echo " "
+	echo "Checking if your C library has broken 64-bit functions..." >&4
+	$cat >check.c <<EOCP
+#include <stdio.h>
+typedef unsigned long long myULL;
+int main (void)
+{
+    struct {
+	double d;
+	myULL  u;
+    } *p, test[] = {
+	{4294967303.15, 4294967303ULL},
+	{4294967294.2,  4294967294ULL},
+	{4294967295.7,  4294967295ULL},
+	{0.0, 0ULL}
+    };
+    for (p = test; p->u; p++) {
+	myULL x = (myULL)p->d;
+	if (x != p->u) {
+	    printf("buggy\n");
+	    return 0;
+	}
+    }
+    printf("ok\n");
+    return 0;
+}
+EOCP
+	set check
+	if eval $compile_ok; then
+	    libcquad=`./check`
+	    echo "Your C library's 64-bit functions are $libcquad."
+	else
+	    echo "(I can't seem to compile the test program.)"
+	    echo "Assuming that your C library's 64-bit functions are ok."
+	    libcquad="ok"
+	fi
+	$rm -f check.c check
+
+	case "$libcquad" in
+	    buggy*)
+		cat >&4 <<EOM
+
+*** You have a C library with broken 64-bit functions.
+*** 64-bit support does not work reliably in this configuration.
+*** Cannot continue, aborting.
+EOM
+		exit 1
+		;;
+	esac
+esac
+EOCBU
+
 # When building in the OpenBSD tree we use different paths
 # This is only part of the story, the rest comes from config.over
 case "$openbsd_distribution" in