Chandler Carruth 444c18dfa3 Enable using our own C++ runtimes across the board (#6549) ...

This enables on-demand building of runtimes by default, and enables
their header files for all of the Clang invocations. This also switches
the default flags to use the LLVM-provided runtimes (compiler-rt,
libunwind, and libcxx).

This also switches even `llvm_symlinks_test` to use the Bazel prebuilt
runtimes, which requires having a way to pass a Carbon flag even when
invoking the busybox as `clang` or `clang++`. This uses the pattern that
has worked for other Clang wrappers of spelling flags:
`-X<tool-name>=--flag=value`

Last but not least, this updates the Carbon Bazel rules to use our
installed and the Bazel prebuilt runtimes. With that, we make the C++
interop hello-world be enabled by default as this should pass reliably
on both Linux and macOS now.

2026-01-07 00:16:50 +00:00

..

BUILD

Enable using our own C++ runtimes across the board (#6549)

2026-01-07 00:16:50 +00:00

hello_world.carbon

Support passing Carbon Optional(T*) to C++ T* parameter. (#6422)

2025-11-25 22:30:14 +00:00