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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Class with same name as module causes compilation error due to incorrect resolution to forward declaration in another module"
href="https://bugs.llvm.org/show_bug.cgi?id=52138">52138</a>
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<th>Summary</th>
<td>Class with same name as module causes compilation error due to incorrect resolution to forward declaration in another module
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Modules
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>rhow@fb.com
</td>
</tr>
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<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=25349" name="attach_25349" title="test case">attachment 25349</a> <a href="attachment.cgi?id=25349&action=edit" title="test case">[details]</a></span>
test case
During a migration to using submodules for some of our libraries we have come
across an edge case where a type with the same name as its containing module is
not found in its imported module, but instead incorrectly located in an
unimported submodule that contains a forward declaration to that type.
I have attached a test case that illustrates the issue. Running the `build.sh`
script results in:
```
test.m:7:21: error: definition of 'c' must be imported from module 'b.b2'
before it is required
return a.cthing.d;
^
./b2.h:2:8: note: definition here is not reachable
@class c;
^
1 error generated.
```
Where test.m imports c.h that defines c:
```
#import "a.h"
#import "c.h"
int test(AClass *a);
int test(AClass *a) {
return a.cthing.d;
}
```
Changing the order of imports, the name of the module or the name of the class
will compile correctly.</pre>
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