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chromium/chromium-66.0.3359.170-gcc8...

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diff -up chromium-66.0.3359.170/mojo/public/c/system/macros.h.gcc8-alignof chromium-66.0.3359.170/mojo/public/c/system/macros.h
--- chromium-66.0.3359.170/mojo/public/c/system/macros.h.gcc8-alignof 2018-05-15 14:58:46.448912634 -0400
+++ chromium-66.0.3359.170/mojo/public/c/system/macros.h 2018-05-15 14:58:52.041784613 -0400
@@ -18,7 +18,13 @@
#endif
// Like the C++11 |alignof| operator.
-#if __cplusplus >= 201103L
+#if defined(__GNUC__) && __GNUC__ >= 8
+// GCC 8 has changed the alignof operator to return the minimal alignment
+// required by the target ABI, instead of the preferred alignment.
+// This means that on 32-bit x86, it will return 4 instead of 8.
+// Use __alignof__ instead to avoid this.
+#define MOJO_ALIGNOF(type) __alignof__(type)
+#elif __cplusplus >= 201103L
#define MOJO_ALIGNOF(type) alignof(type)
#elif defined(__GNUC__)
#define MOJO_ALIGNOF(type) __alignof__(type)