Are We Modules Yet?

Compilers

Tool	C++20 Modules	`import std;`	Header Units	Info
Ninja	✅ 1.11	✅ 1.11	❌
MSBuild	✅	✅	❌
CMake	✅ 3.28	⚙️ 3.30	❌	Support for `import std;` is experimental (blog post).
XMake	✅	✅	✅	Release
Zork++	✅	✅	❌	Project
Build2	✅	✅ 0.17.0	❌	Issue Link
qbs	✅ 2.5	✅ 3.1	❌	Tutorial
Meson	Partial	❌	❌	Issue Link
Gnu Make	✅	❌	❌	Demo Project
Cabin	❌	❌	❌
HMake	✅	✅	✅
GNU Autotools	❌	❌	❌
Scons	⚙️	❌	❌	PR for GCC support
ccache	⚙️	❌	❌	PR
sccache (clang)	✅	✅	❌
sccache (gcc/MSVC)	❌	❌	❌
Bazel	✅	⚙️	❌	Issue Link
Gradle	❌	❌	❌	Issue Link
fastbuild	❌	❌	❌	Issue Link
qmake	❌	❌	❌	💀 Deprecated and should no longer be used!

Tool	C++20 Modules	Info
Clangd	✅	C++20 Modules in clangd
vscode-cmake-tools	❌	Issue Link

Tool	C++20 Modules	`import std;`	Header Units	Info
Sonar	Experimental	✅	❌	Modules documentation

Tool	C++20 Modules	Info
Qt moc	⚙️ (6.12)	Update Sep 2026: Qt 6.12 adds basic C++ modules support to moc. When moc’ing module interfaces and partitions, the generated cpp file is now made part of the respective module. `Q_OBJECT` & friends are still not supported in implementation units and private module fragments. There is still a lot of work to be done (tracked in QTBUG-86697), and most other Qt modules will likely need small fixes to work with modules as well. As abbapoh points out, modules have so far been tested with Qt Creator as a proof of concept; there are currently no plans to add modules support to qtbase itself. The moc machinery has also been back-ported to Qbs, so modules should work with older Qt versions when building with Qbs. The same could probably be done with CMake, although it requires knowing the includes in order to patch the generated file properly. Background: the last mailing-list conversation happened mid December 2023 here, where fabiankosmale laid out the challenges.