dep: Add cpuinfo

dep/cpuinfo/deps/clog/README.md

@@ -0,0 +1,57 @@
+# clog: C-style (a-la printf) logging library
+
+[![BSD (2 clause) License](https://img.shields.io/badge/License-BSD%202--Clause%20%22Simplified%22%20License-blue.svg)](https://github.com/pytorch/cpuinfo/blob/master/deps/clog/LICENSE)
+
+C-style library for logging errors, warnings, information notes, and debug information.
+
+## Features
+
+- printf-style interface for formatting variadic parameters.
+- Separate functions for logging errors, warnings, information notes, and debug information.
+- Independent logging settings for different modules.
+- Logging to logcat on Android and stderr/stdout on other platforms.
+- Compatible with C99 and C++.
+- Covered with unit tests.
+
+## Example
+
+```c
+#include <clog.h>
+
+#ifndef MYMODULE_LOG_LEVEL
+    #define MYMODULE_LOG_LEVEL CLOG_DEBUG
+#endif
+
+CLOG_DEFINE_LOG_DEBUG(mymodule_, "My Module", MYMODULE_LOG_LEVEL);
+CLOG_DEFINE_LOG_INFO(mymodule_, "My Module", MYMODULE_LOG_LEVEL);
+CLOG_DEFINE_LOG_WARNING(mymodule_, "My Module", MYMODULE_LOG_LEVEL);
+CLOG_DEFINE_LOG_ERROR(mymodule_, "My Module", MYMODULE_LOG_LEVEL);
+
+...
+
+void some_function(...) {
+    int status = ...
+    if (status != 0) {
+        mymodule_log_error(
+            "something really bad happened: "
+            "operation failed with status %d", status);
+    }
+
+    uint32_t expected_zero = ...
+    if (expected_zero != 0) {
+        mymodule_log_warning(
+            "something suspicious happened (var = %"PRIu32"), "
+            "fall back to generic implementation", expected_zero);
+    }
+
+    void* usually_non_null = ...
+    if (usually_non_null == NULL) {
+        mymodule_log_info(
+            "something unusual, but common, happened: "
+            "enabling work-around");
+    }
+
+    float a = ...
+    mymodule_log_debug("computed a = %.7f", a);
+}
+```