Submitted By:            Douglas R. Reno <renodr at linuxfromscratch dot org>
Date:                    2019-01-19
Initial Package Version: 5.12.0
Upstream Status:         Not submitted
Origin:                  Arch Linux 32 / Self (improvements in comments)
Description:             This fixes usage of the alignof operator to use
                         the proper behavior implemented before gcc8. Without
                         this change, alignof will return 4 instead of 8.

diff -Naurp qtwebengine-everywhere-src-5.12.0.orig/src/3rdparty/chromium/mojo/public/c/system/macros.h qtwebengine-everywhere-src-5.12.0/src/3rdparty/chromium/mojo/public/c/system/macros.h
--- qtwebengine-everywhere-src-5.12.0.orig/src/3rdparty/chromium/mojo/public/c/system/macros.h	2018-11-13 12:25:11.000000000 -0600
+++ qtwebengine-everywhere-src-5.12.0/src/3rdparty/chromium/mojo/public/c/system/macros.h	2019-01-19 11:45:57.175570538 -0600
@@ -27,7 +27,15 @@
   (sizeof(void*) == 4 ? 32 : 0)
 
 // Like the C++11 |alignof| operator.
-#if __cplusplus >= 201103L
+#if defined(__GNUC__) && __GNUC__ >= 8
+/*
+ * GCC 8 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 (i686), it will return 4 instead of 8.
+ * Use __alignof__ 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)