http://llvm.org/bugs/show_bug.cgi?id=19277
Bug ID: 19277
Summary: if two sibling modules declare the same entity,
loading decl from one entity does not always load from
the other
Product: clang
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Modules
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
Testcase:
$ for i in *; do echo $i; cat -n $i; done
a.h
1 namespace N {
2 struct X;
3 extern X x;
4 }
b.h
1 namespace N {
2 struct X { int n; };
3 }
c.cc
1 #include "a.h"
2 #include "b.h"
3
4 int k = N::x.n;
module.map
1 module a { header "a.h" } module b { header "b.h" }
$ clang -fmodules -fcxx-modules c.cc -I.
c.cc:4:13: error: member access into incomplete type 'N::X'
int k = N::x.n;
^
./a.h:2:10: note: forward declaration of 'N::X'
struct X;
^
1 error generated.
The problem is that nothing in c.cc causes us to load N::X from module b.
For top-level declarations, loading the forward declaration causes us to load
the identifier, which causes us to load all declarations of that identifier,
but that just makes the problem slightly harder to reproduce (you need to
trigger the loading of the forward declaration between the import of module a
and the import of module b).
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