https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66177
Bug ID: 66177
Summary: warn_unused_result doesn't always work
Product: gcc
Version: 4.9.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: gcc at bobbyperu dot info
Target Milestone: ---
Testcase fails to work with gcc, works with clang.
=====
struct QSize
{
QSize(int w, int h) : wd(w), ht(h) {}
QSize expandedTo() const __attribute__ ((__warn_unused_result__))
{
return QSize(2, 3);
}
private:
int wd;
int ht;
};
void foo()
{
QSize sz(2, 2);
sz.expandedTo();
}
=====
$ g++ testcase.cpp -c -Wunused-result
$ clang++ testcase.cpp -c -Wunused-result
testcase.cpp:18:5: warning: ignoring return value of function declared with
warn_unused_result attribute [-Wunused-result]
sz.expandedTo();
^~~~~~~~~~~~~
1 warning generated.
