https://bugs.llvm.org/show_bug.cgi?id=37980
Bug ID: 37980
Summary: modules reject-valid on an implicit non-trivial
function that references a type in another module
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Modules
Assignee: unassignedclangb...@nondot.org
Reporter: dblai...@gmail.com
CC: dgre...@apple.com, llvm-bugs@lists.llvm.org,
richard-l...@metafoo.co.uk
a.cppm:
export module a;
export struct a {
a();
};
b.cppm:
export module b;
import a;
export struct b {
a m; // make b's default ctor implicitly non-trivial & reference a's
default ctor (importantly, in another module)
};
use.cpp
import b; // importing 'a' here is a workaround
void f() {
b x; // anything that requires b's default ctor
};
$ clang++ -fmodules-ts -c -std=c++17 --precompile a.cppm
$ clang++ -fmodules-ts -c -std=c++17 --precompile b.cppm -fmodule-file=a.pcm
$ clang++ -fmodules-ts -c -std=c++17 x.cpp -fmodule-file=a.pcm
-fmodule-file=b.pcm
In file included from use.cpp:1:
b.cppm:3:15: error: definition of 'a' must be imported from module 'a'
before it is required
export struct b {
^
x.cpp:4:14: note: in implicit default constructor for 'b' first required here
void f() { b x; }
^
a.cppm:2:15: note: previous definition is here
export struct a {
^
1 error generated.
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