Initial project import

tools/v/vlib/builtin/builtin_backtraces_nix.c.v

@@ -0,0 +1,12 @@
+module builtin
+
+// <execinfo.h>
+fn C.backtrace(a &voidptr, size i32) i32
+fn C.backtrace_symbols(a &voidptr, size i32) &&char
+fn C.backtrace_symbols_fd(a &voidptr, size i32, fd i32)
+
+$if macos {
+	#include <mach-o/dyld.h>
+
+	fn C._dyld_get_image_header(image_index u32) voidptr
+}