https://bugs.llvm.org/show_bug.cgi?id=51607
Bug ID: 51607
Summary: Broken lambdas with C++ modules
Product: clang
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: release blocker
Priority: P
Component: C++2a
Assignee: unassignedclangb...@nondot.org
Reporter: artyom.lebe...@gmail.com
CC: blitzrak...@gmail.com, erik.pilking...@gmail.com,
llvm-bugs@lists.llvm.org, richard-l...@metafoo.co.uk
Consider the following code:
export module main;// <<< Remove this line to make it work correctly
import <iostream>;
export int
main()
{
([](){ std::cout << "callback 1\n"; })();
([](){ std::cout << "callback 2\n"; })();
return 0;
}
It has the following output:
callback 1
callback 1
Expected output (it is correct, when the code compiled without modules):
callback 1
callback 2
I use the following commands for compiling:
CXX="/opt/clang-12/bin/clang++"
CXX_FLAGS="-std=c++20 -stdlib=libc++ -Wall -Werror -g -O0"
CXX_FLAGS="$CXX_FLAGS -fmodules -fimplicit-modules
-fmodules-cache-path=modules-cache"
$CXX -c $CXX_FLAGS test.cpp -o test.o
$CXX $CXX_FLAGS test.o -o test_mod
clang version 13.0.0 (https://github.com/llvm/llvm-project.git
c1baf946e6cf611ae871e34db5cfea0f94f4b5a0)
Target: x86_64-unknown-linux-gnu
Also tested on: clang version 12.0.0 (https://github.com/llvm/llvm-project/
b978a93635b584db380274d7c8963c73989944a1)
Clang downloaded from GitHub release page.
I also created repository with reproduction code:
https://github.com/vagran/asio-awaitable-modules-problem-demo/tree/exp-lambdas
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