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Everywhere: Switch from (void) to [[maybe_unused]] (#4473)

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Problem:
- `(void)` simply casts the expression to void. This is understood to
  indicate that it is ignored, but this is really a compiler trick to
  get the compiler to not generate a warning.

Solution:
- Use the `[[maybe_unused]]` attribute to indicate the value is unused.

Note:
- Functions taking a `(void)` argument list have also been changed to
  `()` because this is not needed and shows up in the same grep
  command.
This commit is contained in:
Lenny Maiorani 2020-12-20 16:09:48 -07:00 • committed by GitHub
parent 4421d98e30
commit 765936ebae
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GPG key ID: 4AEE18F83AFDEB23
103 changed files with 219 additions and 362 deletions
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12
DevTools/UserspaceEmulator/Emulator.cpp
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@ -1149,10 +1149,8 @@ int Emulator::virt$get_dir_entries(int fd, FlatPtr buffer, ssize_t size)
return rc;
}
int Emulator::virt$ioctl(int fd, unsigned request, FlatPtr arg)
int Emulator::virt$ioctl([[maybe_unused]] int fd, unsigned request, [[maybe_unused]] FlatPtr arg)
{
(void)fd;
(void)arg;
if (request == TIOCGWINSZ) {
struct winsize ws;
int rc = syscall(SC_ioctl, fd, TIOCGWINSZ, &ws);
@ -1493,8 +1491,8 @@ void Emulator::dispatch_one_pending_signal()
}
// Make sure the compiler doesn't "optimize away" this function:
extern void signal_trampoline_dummy(void);
void signal_trampoline_dummy(void)
extern void signal_trampoline_dummy();
void signal_trampoline_dummy()
{
// The trampoline preserves the current eax, pushes the signal code and
// then calls the signal handler. We do this because, when interrupting a
@ -1518,8 +1516,8 @@ void signal_trampoline_dummy(void)
".att_syntax" ::"i"(Syscall::SC_sigreturn));
}
extern "C" void asm_signal_trampoline(void);
extern "C" void asm_signal_trampoline_end(void);
extern "C" void asm_signal_trampoline();
extern "C" void asm_signal_trampoline_end();
void Emulator::setup_signal_trampoline()
{