seanm wrote:
I've tried another project: [opencv](https://github.com/opencv/opencv) and the
result also fails to compile.
One case I think is because two variables are declared together. i.e.:
```
int foo, bar;
```
instead of:
```
int foo;
int bar;
```
Concretely:
```c++
const char * const borderMap[] = { "BORDER_CONSTANT", "BORDER_REPLICATE",
"BORDER_REFLECT", "BORDER_WRAP", "BORDER_REFLECT_101" },
* const btype = borderMap[borderType & ~BORDER_ISOLATED];
```
Got changed to:
```
constexpr const char * borderMap[] = { "BORDER_CONSTANT",
"BORDER_REPLICATE", "BORDER_REFLECT", "BORDER_WRAP", "BORDER_REFLECT_101" },
* const btype = borderMap[borderType & ~BORDER_ISOLATED];
```
which is fine for `borderMap` but not for `btype`.
Resulting in:
```
/Users/sean/external/opencv/modules/imgproc/src/filter.dispatch.cpp:757:17:
error: constexpr variable 'btype' must be initialized by a constant expression
757 | * const btype = borderMap[borderType & ~BORDER_ISOLATED];
| ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
```
https://github.com/llvm/llvm-project/pull/146553
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