Turns out, this is due to the programmer's assumption that fcb->name[8]
and fcb->ext[3] can be accessed contiguously by fcb->name[0..10]. So,
the code is actually "lazy", if not bad. Obviously, this has worked in C
for a long time but no longer can be depended on.
** Changed in: gcc-9 (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1909838
Title:
gcc -O3 produces invalid code
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