Re: need help to get bitoffsetof bitwidth for clang

[Dakota via Digitalmars-d-learn]

On Wednesday, 3 July 2024 at 21:47:32 UTC, Tim wrote:
If you only want to see the layout, you can use the following 
command to dump it:
```
clang test.c -Xclang -fdump-record-layouts -c
```
File test.c could contain the following:
```
struct S
{
    int a : 3;
    int b : 29;
};
struct S dummy;
```

The above clang command would then output:
```
*** Dumping AST Record Layout
         0 | struct S
     0:0-2 |   int a
    0:3-31 |   int b
           | [sizeof=4, align=4]
```

Inside a C/C++ program you could initialize a struct with all 
0xff, set one bitfield to zero and look at the bits. I have 
used this to compare the bitfield layout between D and C++ in a 
test added in https://github.com/dlang/dmd/pull/16590.

Thanks for the tips.

Then I guess there is no easy way to get equivalent in c for 
`bitoffsetof` and `bitwidth`