https://bugs.llvm.org/show_bug.cgi?id=50639
Bug ID: 50639
Summary: Compiler hang when declaring an array of structures
Product: clang
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: C
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected],
[email protected]
Created attachment 24933
--> https://bugs.llvm.org/attachment.cgi?id=24933&action=edit
code that caused a compiler hang with -O0 and -O2
Hi,
I got a compiler hang when running:
```
clang -O2 -pedantic -w -Wextra test874084080-f2f58a.c
```
I attached the code after pre-processing (so all headers are in, but I can
supply the original code and the headers separately if needed).
I ran it for 12 hours with a pretty strong machine: Ubuntu-18,32GB, 64x, 4CPU.
It happens with clang-10, 11, 12 and 13.
GCC returns the errors in few seconds; this program is not supposed to pass
compilation, I hit this issue while using creduce for some testcases I got.
It seems to be related to this variable:
```
static struct S0 g_434[];
```
When replacing it to be
```
static struct S0 g_434;
```
and patching the use of it in the code, the problem disappeared.
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