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build/build_config.h

Index: build/build_config.h
diff --git a/build/build_config.h b/build/build_config.h
index fd5489f6459bedf3045a19cc3887821144a9eef6..35528561903f30cc71bb120b12b9d5e470e8c9aa 100644
--- a/build/build_config.h
+++ b/build/build_config.h
@@ -49,6 +49,8 @@
 #endif
 #elif defined(_WIN32)
 #define OS_WIN 1
+#elif defined(__Fuchsia__)
+#define OS_FUCHSIA 1
 #elif defined(__FreeBSD__)
 #define OS_FREEBSD 1
 #elif defined(__NetBSD__)
@@ -168,12 +170,11 @@
 // Type detection for wchar_t.
 #if defined(OS_WIN)
 #define WCHAR_T_IS_UTF16
-#elif defined(OS_POSIX) && defined(COMPILER_GCC) && \
-    defined(__WCHAR_MAX__) && \
+#elif (defined(OS_POSIX) || defined(OS_FUCHSIA)) && defined(COMPILER_GCC) && \
+    defined(__WCHAR_MAX__) &&                                                \
     (__WCHAR_MAX__ == 0x7fffffff || __WCHAR_MAX__ == 0xffffffff)
 #define WCHAR_T_IS_UTF32
-#elif defined(OS_POSIX) && defined(COMPILER_GCC) && \
-    defined(__WCHAR_MAX__) && \
+#elif defined(OS_POSIX) && defined(COMPILER_GCC) && defined(__WCHAR_MAX__) && \
     (__WCHAR_MAX__ == 0x7fff || __WCHAR_MAX__ == 0xffff)
 // On Posix, we'll detect short wchar_t, but projects aren't guaranteed to
 // compile in this mode (in particular, Chrome doesn't). This is intended for