https://bugs.llvm.org/show_bug.cgi?id=49771
Bug ID: 49771
Summary: clang++ chockes on modules when specifying c++20
Product: clang
Version: 11.0
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: C++2a
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected]
I have a program for prescanning source files. That program invokes
```
clang++ -std=20 ..include flags.. source.cpp -E > output
```
Say that i have a file called source.cpp:
```
import x;
```
Then when trying to expand it with -E i get an error that "module x is not
found". That seems to be a bug. Surely the lookup of modules does not need to
be performed to be able to expand the macros of a file?
This problem is only present if you specify the c++ version to be 20, and not
for example 17. My guess is that this makes modules enabled.
If this is not a bug, how do you expand macros in a file without getting a
error for imports?
tested with clang++-11 and clang++-12
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