C 20 Modules Gcc

Export int f int x return 2.

C 20 modules gcc. These include c 11 c 14 c 17 c 20 and later accepted revisions c 23 c 2b to the standard as well as various technical specifications. However with some flags and a development branch you can play around with the in progress implementation read more about it on gcc s modules wiki. First define the module interface file. C 2b featuresnote that this list may change as the draft c 2b standard evolves.

Still to be finished is the c modules support as one of the last big ticket items. Modules is one of the five prominent features of c 20. C 20 support is not complete which is fair enough given that we re in 2020. Gcc has experimental support for the next revision of the c standard which is expected to be published in 2020.

For example the separation of header and source files becomes as obsolete as the preprocessor. Concepts library c 20 diagnostics library. Gcc version 10 0 1 20200211 experimental devel c modules fe76dae46c6 20200212 0942 gcc which shows the git branch hash and build date. The standard became technically finalized by wg21 at the meeting in prague in february 2020.

Modules will overcome the restrictions of header files. The modules compiler s v output identifies itself with something like. C 20 features are available since gcc 8. They promise a lot.

Filesystem library c 17 regular expressions library c 11 atomic operations library c 11 thread support library. Let s take the same example files with a small change as in the vs blog post about experimental module support. The following table presents compiler support for new c features. Foo cppm export module m.

And c 20 technically doesn t exist yet. Due to the in development nature of the implementation things are undoubtedly buggy. The gcc wiki outlines the current in progress modules work. C 20 is the name for the revision of the iso iec standard for the c programming language following c 17.

Support add the command line parameter std c 20 use std c 2ain gcc 9 and earlier. By default clang recognizes files with cppm extension and some others as c module interface files. The c standards support for the gcc compiler show much of the c 20 language support is already in place if on gcc 10 while some features are already in gcc 8 9. C 20 is currently undergoing final editorial work after a draft was approved on 4th september 2020.

The global module fragment is only used to compose module interfaces and the semantics of this area borrows semantics described in the modules ts regarding entities attached to the global module. As of this commit clang has experimental support for the modules ts.