ISPC: Generated Headers suffix configurable with a better default

The target property `ISPC_HEADER_SUFFIX` and associated global
variable now can control the suffix used when generating the
C/C++ interoperability ISPC headers.

In addition the default suffix is now "_ispc.h" which matches the
common convention that the ISPC compiler team uses and recommends.

1 files changed, 17 insertions, 0 deletions

diff --git a/Tests/ISPC/CustomHeaderSuffix/extra.cxx b/Tests/ISPC/CustomHeaderSuffix/extra.cxx
new file mode 100644
index 0000000..0354e2d
--- /dev/null
+++ b/Tests/ISPC/CustomHeaderSuffix/extra.cxx
@@ -0,0 +1,17 @@
+#include <stdio.h>
+
+#include "extra___ispc.h"
+
+int extra()
+{
+  float vin[16], vout[16];
+  for (int i = 0; i < 16; ++i)
+    vin[i] = i;
+
+  ispc::extra(vin, vout, 16);
+
+  for (int i = 0; i < 16; ++i)
+    printf("%d: extra(%f) = %f\n", i, vin[i], vout[i]);
+
+  return 0;
+}