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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - modules reject-valid on an implicit non-trivial function that references a type in another module"
href="https://bugs.llvm.org/show_bug.cgi?id=37980">37980</a>
</td>
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<th>Summary</th>
<td>modules reject-valid on an implicit non-trivial function that references a type in another module
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Modules
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>dblaikie@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
</td>
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<p>
<div>
<pre>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.</pre>
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