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diff --git a/mozglue/linker/Logging.h b/mozglue/linker/Logging.h
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef Logging_h
+#define Logging_h
+
+#include <cstdlib>
+#include "mozilla/Likely.h"
+#include "mozilla/MacroArgs.h"
+
+#ifdef ANDROID
+# include <android/log.h>
+# define LOG(...) \
+ __android_log_print(ANDROID_LOG_INFO, "GeckoLinker", __VA_ARGS__)
+# define WARN(...) \
+ __android_log_print(ANDROID_LOG_WARN, "GeckoLinker", __VA_ARGS__)
+# define ERROR(...) \
+ __android_log_print(ANDROID_LOG_ERROR, "GeckoLinker", __VA_ARGS__)
+#else
+# include <cstdio>
+
+/* Expand to 1 or m depending on whether there is one argument or more
+ * given. */
+# define MOZ_ONE_OR_MORE_ARGS_IMPL2(_1, _2, _3, _4, _5, _6, _7, _8, _9, N, \
+ ...) \
+ N
+# define MOZ_ONE_OR_MORE_ARGS_IMPL(args) MOZ_ONE_OR_MORE_ARGS_IMPL2 args
+# define MOZ_ONE_OR_MORE_ARGS(...) \
+ MOZ_ONE_OR_MORE_ARGS_IMPL((__VA_ARGS__, m, m, m, m, m, m, m, m, 1, 0))
+
+# define MOZ_MACRO_GLUE(a, b) a b
+
+/* Some magic to choose between LOG1 and LOGm depending on the number of
+ * arguments */
+# define MOZ_CHOOSE_LOG(...) \
+ MOZ_MACRO_GLUE(MOZ_CONCAT(LOG, MOZ_ONE_OR_MORE_ARGS(__VA_ARGS__)), \
+ (__VA_ARGS__))
+
+# define LOG1(format) fprintf(stderr, format "\n")
+# define LOGm(format, ...) fprintf(stderr, format "\n", __VA_ARGS__)
+# define LOG(...) MOZ_CHOOSE_LOG(__VA_ARGS__)
+# define WARN(...) MOZ_CHOOSE_LOG("Warning: " __VA_ARGS__)
+# define ERROR(...) MOZ_CHOOSE_LOG("Error: " __VA_ARGS__)
+
+#endif
+
+class Logging {
+ public:
+ static bool isVerbose() { return Singleton.verbose; }
+
+ private:
+ bool verbose;
+
+ public:
+ static void Init() {
+ const char* env = getenv("MOZ_DEBUG_LINKER");
+ if (env && *env == '1') Singleton.verbose = true;
+ }
+
+ private:
+ static Logging Singleton;
+};
+
+#define DEBUG_LOG(...) \
+ do { \
+ if (MOZ_UNLIKELY(Logging::isVerbose())) { \
+ LOG(__VA_ARGS__); \
+ } \
+ } while (0)
+
+#endif /* Logging_h */