add stack protector safety when linking libc

 * introduce zigrt file. it contains only weak symbols so that
   multiple instances can be merged. it contains __zig_panic
   so that multiple .o files can call the same panic function.
 * remove `@setFnVisible` builtin and add @setGlobalLinkage builtin
   which is more powerful
 * add `@panic` builtin function.
 * fix collision of symbols with extern prototypes and internal
   function names
 * add stack protector safety when linking against libc. To add
   the safety mechanism without libc requires implementing
   Thread Local Storage. See #276

1 files changed, 0 insertions, 12 deletions

diff --git a/std/special/panic.zig b/std/special/panic.zig
deleted file mode 100644
index 9b58a4d9c8..0000000000
--- a/std/special/panic.zig
+++ /dev/null
@@ -1,12 +0,0 @@
-// This file is included if and only if the user's main source file does not
-// include a public panic function.
-// If this file wants to import other files *by name*, support for that would
-// have to be added in the compiler.
-
-pub coldcc fn panic(message: []const u8) -> noreturn {
-    if (@compileVar("os") == Os.freestanding) {
-        while (true) {}
-    } else {
-        @import("std").debug.panic(message);
-    }
-}