| Summary: | missing warning on uninitialized variable if used within a ternary expression (?:) | ||
|---|---|---|---|
| Product: | gcc | Reporter: | peter.barth |
| Component: | c++ | Assignee: | Andrew Pinski <pinskia> |
| Status: | RESOLVED DUPLICATE | ||
| Severity: | normal | CC: | gcc-bugs, giovannibajo, nathan |
| Priority: | P3 | Keywords: | diagnostic |
| Version: | 3.0 | ||
| Target Milestone: | --- | ||
| Host: | Target: | ||
| Build: | Known to work: | ||
| Known to fail: | Last reconfirmed: | 2003-08-02 17:52:06 | |
Fix: ??? State-Changed-From-To: open->analyzed State-Changed-Why: confirmed. No warning at -W -Wall -O2 Responsible-Changed-From-To: unassigned->gdr Responsible-Changed-Why: Diagnostic mantainer Another `int j=j;' warning problems. I am working on a patch. |
GCC should issue a warning on int j = (j < 0) ? -i : i; that j is used uninitialized (some other compilers do). Complete code snippet --- #include <iostream> using namespace std; int f(int i) { int j = (j < 0) ? -i : i; // shouldn't that generate a warning that j is used uninitialized return j; } int main() { int h = 3; cout << h << " " << f(h) << "\n"; h = -3; cout << h << " " << f(h) << "\n"; return 0; } --- Release: gcc-2.95.3, gcc-3.0 Environment: SuSe Linux 7.3 How-To-Repeat: #include <iostream> using namespace std; int f(int i) { int j = (j < 0) ? -i : i; // shouldn't that generate a warning that j is used uninitialized return j; } int main() { int h = 3; cout << h << " " << f(h) << "\n"; h = -3; cout << h << " " << f(h) << "\n"; return 0; }