ID0000685: **This issue was created automatically from Mantis Issue 685. Further discussion may take place here.** --- | **Id** | **Project** | **Category** | **View** | **Due Date** | **Updated** | | --- | --- | --- | --- | --- | --- | | ID0000685 | Frama-C | Kernel | public | 2011-01-24 | 2012-09-19 | | | | | | | | | --- | --- | --- | --- | --- | --- | | **Reporter** | virgile | **Assigned To** | virgile | **Resolution** | fixed | | **Priority** | normal | **Severity** | feature | **Reproducibility** | always | | **Platform** | - | **OS** | - | **OS Version** | - | | **Product Version** | Frama-C Carbon-20101202-beta2 | **Target Version** | - | **Fixed in Version** | Frama-C Oxygen-20120901 | ### Description : When an execution path in a function may fall through, CIL adds automatically a return statement. If the path is not unfeasible, this would mask an undefined behavior (6.9.1.14), as shown in the example below, where Frama-C would conclude that z is 0, while gcc reports 12: int x; int f(void) { x++; if (x<=10) return x-1; } int main() { x = 11; int y = 42; int z = f(); return z; }