diff options
Diffstat (limited to 'libbuild2/cxx')
| -rw-r--r-- | libbuild2/cxx/init.cxx | 23 |
1 files changed, 9 insertions, 14 deletions
diff --git a/libbuild2/cxx/init.cxx b/libbuild2/cxx/init.cxx index 3023ad5..8948e6a 100644 --- a/libbuild2/cxx/init.cxx +++ b/libbuild2/cxx/init.cxx @@ -433,20 +433,15 @@ namespace build2 } case compiler_type::clang: { - // @@ TMP: revise + // Things (command line options, semantics) changed quite a bit + // around Clang 16 so we don't support anything earlier than + // that (it's not practically usable anyway). // - // At the time of this writing, support for C++20 modules in - // Clang is incomplete. And starting with Clang 9 (Apple Clang - // 11.0.3), they are enabled by default in the C++2a mode which - // breaks the way we set things up for partial preprocessing; - // see this post for details: - // - // http://lists.llvm.org/pipermail/cfe-dev/2019-October/063637.html - // - // As a result, for now, we only enable modules if forced with - // explicit cxx.features.modules=true. - // - // Also see Clang modules support hack in cc::compile. + // Clang enable modules by default in c++20 or later but they + // don't yet (as of Clang 18) define __cpp_modules. When they + // do, we can consider enabling modules by default on our side. + // For now, we only enable modules if forced with explicit + // cxx.features.modules=true. // if (modules.value) { @@ -459,7 +454,7 @@ namespace build2 // See https://github.com/llvm/llvm-project/issues/71364 // - prepend ("-D__cpp_modules=201704"); // p0629r0 + prepend ("-D__cpp_modules=201907L"); modules = true; } |