http://llvm.org/bugs/show_bug.cgi?id=22691
Bug ID: 22691
Summary: Incompatible behavior and warning for '#pragma GCC
diagnostic pop' with no corresponding push
Product: clang
Version: 3.4
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
https://gcc.gnu.org/onlinedocs/gcc/Diagnostic-Pragmas.html states that "if a
pop has no matching push, the command-line options are restored". This matches
the actual behavior for GCC (provided you extend it to also mean that defaults
are restored for things not specified on the command-line, which makes sense).
In clang, a pop without a corresponding push generates a warning and does not
seem to restore warnings.
Test case:
void f(void) {
#pragma GCC diagnostic ignored "-Wunused-value"
0;
#pragma GCC diagnostic pop
0;
}
GCC generates a warning for the second '0;'. clang only generates a "warning:
pragma diagnostic pop could not pop, no matching push".
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