Public bug reported:
Here is a sample program,
printf "#include <sys/uio.h>\nvoid foo(void) {\n (void)writev(1,
(void*)0, 0);\n }\n" | gcc -Wall -Wformat=2 -Wshadow -O1 -c -xc - -o
foo.o
If you change to '-O0', there is no warning. I have x86_64 but I doubt
that matters? The issue is to have the warnings, but ignore by casting
the result for that particular case (next statement is abort()).
The same things happens in 4.8, 4.9, and version 5. Maybe this is
desired?
** Affects: gcc-7 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1837329
Title:
C unsed results warning when optiming
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