fix(epicardium): Fix sphinx-doc errors

Signed-off-by: Rahix <rahix@rahix.de>

Documentation/conf.py

@@ -103,6 +103,7 @@ try:
     extensions.append("hawkmoth")
 
     cautodoc_root = os.path.abspath("..")
+    cautodoc_clang = "-D__SPHINX_DOC"
     has_hawkmoth = True
 except ImportError as e:
     if e.name == "clang":

epicardium/epicardium.h

 #ifndef _EPICARDIUM_H
 #define _EPICARDIUM_H
+
 #include <stdint.h>
-#include <stddef.h>
 #include <errno.h>
 
+#ifndef __SPHINX_DOC
+/* stddef.h is not recognized by hawkmoth for some odd reason */
+#include <stddef.h>
+#else
+typedef unsigned int size_t;
+#endif /* __SPHINX_DOC */
+
 /* clang-format off */
 #define API_INT_CTRL_C  1
 #define API_INT_BHI160  2
 #define API_INT_MAX     API_INT_BHI160
 
+/*
+ * These definitions are required for the code-generator.  Please don't touch!
+ */
 #ifndef API
 #define API(id, def) def
 #endif

epicardium/modules/stream.h

 #ifndef STREAM_H
 #define STREAM_H
 
-#include <stddef.h>
 #include <stdint.h>
 
+#ifndef __SPHINX_DOC
+/* stddef.h is not recognized by hawkmoth for some odd reason */
+#include <stddef.h>
+#else
+typedef unsigned int size_t;
+#endif /* __SPHINX_DOC */
+
 #include "FreeRTOS.h"
 #include "queue.h"