From 1f943663b8730c94ce737bb989f8f27e586ea0a1 Mon Sep 17 00:00:00 2001
From: Tim Allen <screwtape@froup.com>
Date: Sat, 17 Oct 2020 10:17:56 +1100
Subject: [PATCH] C89 requires __STDC__ to be defined, but not __STDC_VERSION__

gcc defines it anyway, but clang doesn't.

Fixes #22.
---
 settings.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/settings.h b/settings.h
index bd65b151..8dbcec5a 100644
--- a/settings.h
+++ b/settings.h
@@ -14,7 +14,7 @@
   #if !defined(LIBCO_MP) /* Running in single-threaded environment */
     #define thread_local
   #else /* Running in multi-threaded environment */
-    #if defined(__STDC_VERSION__) /* Compiling as C Language */
+    #if defined(__STDC__) /* Compiling as C Language */
       #if defined(_MSC_VER) /* Don't rely on MSVC's C11 support */
         #define thread_local __declspec(thread)
       #elif __STDC_VERSION__ < 201112L /* If we are on C90/99 */
@@ -55,7 +55,7 @@
    - alignas (TYPE) is equivalent to alignas (alignof (TYPE)).
 */
 #if !defined(alignas) 
-  #if defined(__STDC_VERSION__) /* C Language */
+  #if defined(__STDC__) /* C Language */
     #if defined(_MSC_VER) /* Don't rely on MSVC's C11 support */
       #define alignas(bytes) __declspec(align(bytes))
     #elif __STDC_VERSION__ >= 201112L /* C11 and above */