majnemer added inline comments.
================
Comment at: test/std/utilities/meta/meta.type.synop/endian.pass.cpp:39-42
+ union {
+ uint32_t i;
+ char c[4];
+ } u = {0x01020304};
----------------
This is undefined behavior as-is because you are reading from a union member
other than the active union member.
I'd recommend a sequence like:
uint32_t i = 0x01020304;
char c[4];
memcpy(c, &i, 4);
https://reviews.llvm.org/D35472
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