espradio: implement support for wifi/BLE on the ESP32-C3

This is a work in progress. It does not yet work.

espradio/blobs/headers/esp_compiler.h

@@ -0,0 +1,54 @@
+/*
+ * SPDX-FileCopyrightText: 2016-2022 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#pragma once
+
+#include "sdkconfig.h"
+
+/*
+ * The likely and unlikely macro pairs:
+ * These macros are useful to place when application
+ * knows the majority ocurrence of a decision paths,
+ * placing one of these macros can hint the compiler
+ * to reorder instructions producing more optimized
+ * code.
+ */
+#if (CONFIG_COMPILER_OPTIMIZATION_PERF)
+#ifndef likely
+#define likely(x)      __builtin_expect(!!(x), 1)
+#endif
+#ifndef unlikely
+#define unlikely(x)    __builtin_expect(!!(x), 0)
+#endif
+#else
+#ifndef likely
+#define likely(x)      (x)
+#endif
+#ifndef unlikely
+#define unlikely(x)    (x)
+#endif
+#endif
+
+/*
+ * Utility macros used for designated initializers, which work differently
+ * in C99 and C++ standards mainly for aggregate types.
+ * The member separator, comma, is already part of the macro, please omit the trailing comma.
+ * Usage example:
+ *   struct config_t { char* pchr; char arr[SIZE]; } config = {
+ *              ESP_COMPILER_DESIGNATED_INIT_AGGREGATE_TYPE_EMPTY(pchr)
+ *              ESP_COMPILER_DESIGNATED_INIT_AGGREGATE_TYPE_STR(arr, "Value")
+ *          };
+ */
+#if defined(__cplusplus) && __cplusplus >= 202002L
+#define ESP_COMPILER_DESIGNATED_INIT_AGGREGATE_TYPE_STR(member, value)  .member = value,
+#define ESP_COMPILER_DESIGNATED_INIT_AGGREGATE_TYPE_EMPTY(member) .member = { },
+#elif defined(__cplusplus) && __cplusplus < 202002L
+#define ESP_COMPILER_DESIGNATED_INIT_AGGREGATE_TYPE_STR(member, value)  { .member = value },
+#define ESP_COMPILER_DESIGNATED_INIT_AGGREGATE_TYPE_EMPTY(member) .member = { },
+#else
+#define ESP_COMPILER_DESIGNATED_INIT_AGGREGATE_TYPE_STR(member, value)  .member = value,
+#define ESP_COMPILER_DESIGNATED_INIT_AGGREGATE_TYPE_EMPTY(member)
+#endif