Merge pull request #12135 from benpicco/libb2-fix

pkg/libb2: rename config.h to avoid conflicts in the global namespace, set HAVE_ALIGNED_ACCESS_REQUIRED based on CPU (fixes build on esp8266)

cpu/native/include/cpu.h

@@ -26,6 +26,12 @@
 extern "C" {
 #endif
 
+/**
+ * @brief   The CPU supports unaligned memory access.
+ *          Even if the underlying architecture does not support it, the kernel will take care of it.
+ */
+#define CPU_HAS_UNALIGNED_ACCESS
+
 /**
  * @brief   Prints the address the callee will return to
  */

pkg/libb2/include/libb2_config.h

@@ -1,5 +1,7 @@
-#ifndef CONFIG_H
-#define CONFIG_H
+#ifndef LIBB2_CONFIG_H
+#define LIBB2_CONFIG_H
+
+#include "cpu.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -13,7 +15,11 @@ extern "C" {
 #define NATIVE_LITTLE_ENDIAN
 #endif
 
+#ifndef CPU_HAS_UNALIGNED_ACCESS
+#define HAVE_ALIGNED_ACCESS_REQUIRED
+#endif
+
 #ifdef __cplusplus
 }
 #endif
-#endif /* CONFIG_H */
+#endif /* LIBB2_CONFIG_H */