| Issue |
150536
|
| Summary |
[clang] clang 21.1.0_rc1 hangs while compiling GTK 3.24.49 with -Wmissing-noreturn
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
vimproved
|
While compiling GTK 3.24.49, clang 21.1.0_rc1 hangs indefinitely while building two files: `gtktoolbar.c` and `inspector/object-tree.c`. While reducing, I figured out that this is due to the `-Wmissing-noreturn` diagnostic (which is enabled by default by the GTK build system). This does not happen with clang 20.1.8. I have not tested HEAD (however I will do so if it is requested). The reductions of the two files are functionally the same but I've put them both here to be exhaustive.
## Reduction of `gtktoolbar.c`
```c
typedef void (*GtkCallback)();
int gtk_toolbar_forall_list;
void gtk_toolbar_forall() {
GtkCallback callback;
while (gtk_toolbar_forall_list)
;
callback();
}
```
<details>
<summary>Reduction script (gtktoolbar-reduce.c is preprocessed gtktoolbar.c)</summary>
```python
#!/usr/bin/env python3
import subprocess
try:
subprocess.run("clang -Wmissing-noreturn -o gtktoolbar-reduce.c.o -c gtktoolbar-reduce.c", shell=True, timeout=1)
except subprocess.TimeoutExpired:
subprocess.run("clang-20 -Wmissing-noreturn -o gtktoolbar-reduce.c.o -c gtktoolbar-reduce.c", shell=True)
else:
exit(1)
```
Tweak the timeout value as needed.
</details>
## Reduction of `inspector/object-tree.c`
```c
typedef void (*ObjectTreeForallFunc)();
int object_tree_widget_forall_i;
void object_tree_widget_forall() {
ObjectTreeForallFunc forall_func;
for (; object_tree_widget_forall_i;)
;
forall_func();
}
```
<details>
<summary>Reduction script (object-tree-reduce.c is preprocessed inspector/object-tree.c)</summary>
```python
#!/usr/bin/env python3
import subprocess
try:
subprocess.run("clang -Wmissing-noreturn -o object-tree-reduce.c.o -c object-tree-reduce.c", shell=True, timeout=1)
except subprocess.TimeoutExpired:
subprocess.run("clang-20 -Wmissing-noreturn -o object-tree-reduce.c.o -c object-tree-reduce.c", shell=True)
else:
exit(1)
```
Tweak the timeout value as needed.
</details>
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