Does GCC support C++20 std::format?

Question

If it doesn't, do you know what compiler or version will?

See cppreference/format.

Solution 1

Does gcc support c++20 std::format?

Not yet!

I am the one expecting to use std::format, but there's no compiler support yet, even gcc 10. See Text formating in Library features.

Compiler support for C++20 library features

Solution 2

As of February 2022, NO, GCC doesn't support std::format yet.

MSVC (version 19.29 and above) is the only compiler that Fully supports std::format. Clang 14 (with libc++14) also Has almost full Support for std::format.

Since std::format is based on fmt library, you can use fmt::format till std::format arrives in GCC.

See Compiler support here

{fmt} library GitHub repo

Solution 3

As of today (12 Oct 2021), neither GCC 11.2 and Clang 13.0.0 support this feature. Or rather, their standard library implementation doesn't support it as it's a library feature.

Their standard library current status can be seen here:

• libstdc++ (GCC)

• libc++ (Clang)

P.S. (25 Jan 2022)

• libc++ of Clang 14.0.0 has std::format support but: "The paper is implemented but still marked as an incomplete feature. Not yet implemented LWG-issues will cause API and ABI breakage" as mentioned here