Initial import of libdpf.

Co-authored-by: Cursor <cursoragent@cursor.com>

thirdparty/hedley/test/constant.c

@@ -0,0 +1,28 @@
+#if defined(_MSC_VER)
+  #pragma warning(push)
+  #pragma warning(disable:4668)
+  #include <assert.h>
+  #include <stddef.h>
+  #pragma warning(pop)
+#else
+  #include <assert.h>
+  #include <stddef.h>
+#endif
+
+#include "../hedley.h"
+
+int main(int argc, char* argv[HEDLEY_ARRAY_PARAM(argc)]) {
+  char foo[HEDLEY_REQUIRE_CONSTEXPR(42)] = { 0, };
+
+  assert(argv[argc - 1] != NULL);
+  assert(foo[0] == 0);
+
+#if defined(HEDLEY__IS_CONSTEXPR)
+  assert(HEDLEY__IS_CONSTEXPR(1729) == 1);
+  assert(HEDLEY__IS_CONSTEXPR(argc) == 0);
+#endif
+
+  assert(HEDLEY_IS_CONSTANT(argc) == 0);
+
+  return 0;
+}