Bug 24303 – anonymous struct problems when typedef'd in separate C files

Dennis 2023-12-12 23:04:37 UTC submitted: Another example: (not sure if it's the same bug) a.c ```C typedef struct {} Slice; struct Lang { Slice *slices; }; ``` b.c ```C typedef struct {} Slice; struct Lang { Slice *slices; }; void langmap(struct Lang *self) { Slice slice = *self->slices; } ``` ``` dmd a.c // works dmd b.c // works dmd b.c a.c // works dmd a.c b.c // fails: b.c(11): Error: cannot implicitly convert expression `*(*self).slices` of type `__tag2` to `__tag3` ```

This is a victim of the compiler adding the missing tag name for the anonymous struct, but generating a different name for the two definitions. The type of the struct is keyed off of the tag name - so different tag names mean different types. The solution is to generate the same tag name for each. I have an idea how to do that by making use of the typedef identifier.

@WalterBright created dlang/dmd pull request #15958 "fix Issue 24303 - anonymous struct problems when typedef'd in separat…" fixing this issue: - fix Issue 24303 - anonymous struct problems when typedef'd in separate C files https://github.com/dlang/dmd/pull/15958

dlang/dmd pull request #15958 "fix Issue 24303 - anonymous struct problems when typedef'd in separat…" was merged into master: - 135e3c07b2c2548ecec0ea00478f5e1e2191947c by Walter Bright: fix Issue 24303 - anonymous struct problems when typedef'd in separate C files https://github.com/dlang/dmd/pull/15958