[cfe-dev] [Clang Modules] error: definition with same mangled name as another definition

[Dmitry Panin via cfe-dev]

Thanks for looking!
Submitted into bugzilla as: https://bugs.llvm.org/show_bug.cgi?id=33924


On Mon, Jul 24, 2017 at 7:52 PM, Bruno Cardoso Lopes <
bruno.cardoso at gmail.com> wrote:

> Hi Dmitry,
>
> On Sat, Jul 22, 2017 at 12:31 PM, Dmitry Panin via cfe-dev
> <cfe-dev at lists.llvm.org> wrote:
> > I am trying to use Clang Modules, but getting the following error:
> >
> >   error: definition with same mangled name as another definition
> >
> > Full message:
> >
> > In module 'foo1' imported from main.cpp:1:
> > In module 'format' imported from ./foo1.h:3:
> > ./format.h:6:8: error: definition with same mangled name as another
> > definition
> > void doFormat(T& out) {}
> >        ^
> > ./format.h:6:8: note: previous definition is here
> >
> > It seems like the error is happening when we pass lambda as templated
> > argument (see below for minimized example).
> >
> > Is this error expected? I am not sure how should I fix that as clang
> points
> > to exactly the same place for previous definition.
>
> Looks like it should work, can you file a bug?
>
> >
> > Using clang built from latest trunk shows the same error, but also the
> > following failed assertion:
> >
> > llvm/lib/IR/Value.cpp:402: void llvm::Value::doRAUW(llvm::Value*, bool):
> > Assertion `New->getType() == getType(
> > ) && "replaceAllUses of value with new value of different type!"' failed.
> >
> >
> > Here is the following self-contained example:
> > Commandline:
> > clang++ --std=c++14 -I .  -fmodules -fcxx-modules
> > -fmodules-cache-path=./modules_out/_module_cache -c main.cpp -o main.o
> >
> > Files:
> > // --- main.cpp
> > #include "foo1.h"
> > #include "foo2.h"
> >
> > int main () {
> >   return 0;
> > }
> >
> > // -- foo1.h
> > #pragma once
> >
> > #include "format.h"
> >
> > void foo1() {
> >   format(0);
> > }
> >
> > // -- foo2.h
> > #pragma once
> >
> > #include "format.h"
> >
> > void foo2() {
> >   format(0);
> > }
> >
> > // -- format.h
> > #pragma once
> >
> > class Formatter {
> > public:
> >   template <class T>
> >   void doFormat(T& out) {}
> > };
> >
> >
> > template <class T>
> > void format(T t) {
> >   Formatter f;
> >   auto lambda = [] {};
> >   f.doFormat(lambda);
> > }
> >
> >
> > // -- module.modulemap
> > module foo1 {
> >     header "foo1.h"
> >     export *
> > }
> >
> > module foo2 {
> >     header "foo2.h"
> >     export *
> > }
> >
> > module format {
> >     header "format.h"
> >     export *
> > }
> >
> > _______________________________________________
> > cfe-dev mailing list
> > cfe-dev at lists.llvm.org
> > http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-dev
> >
>
>
>
> --
> Bruno Cardoso Lopes
> http://www.brunocardoso.cc
>
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