http://llvm.org/bugs/show_bug.cgi?id=13815
Bug #: 13815
Summary: -Wunreachable-code cannot be silenced for default
cases in switches
Product: clang
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: -New Bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
The flag -Wcovered-switch-default enables warnings for default cases in
switches that cannot be reached, e.g. because all possible enum values have
been listed. For code where the defaults are added intentionally, the
-Wno-covered-switch-default can be used to silence the warning. However,
-Wunreachable-code also enables warnings for the same cases, but they cannot be
silenced without -Wno-unreachable-code, which disables all unreachable code
warnings.
Code snipped illustrating the behaviour follows.
#include <stdlib.h>
enum e {E1, E2};
int main(int argc, char* argv[])
{
enum e e = atoi(argv[argc-1]);
switch(e)
{
case E1: return 1;
case E2: return 2;
/* Both -Wcovered-switch-default and -Wunreachable-code trigger below */
default: return 3;
}
}
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