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          On my local system, building the module with GCC 15 fails:

[build] In file included from ./proxy/build/installed/install/include/proxy/proxy.ixx:3:
[build] ./proxy/build/installed/install/include/proxy/proxy.h:1527:16: error: ‘consteval auto pro::details::normalize(pro::proxiable_ptr_constraints)’ exposes TU-local entity ‘pro::details::invalid_size’
[build]  1527 | consteval auto normalize(proxiable_ptr_constraints value) {
[build]       |                ^~~~~~~~~
[build] ./proxy/build/installed/install/include/proxy/proxy.h:1524:23: note: ‘pro::details::invalid_size’ declared with internal linkage
[build]  1524 | constexpr std::size_t invalid_size = std::numeric_limits<std::size_t>::max();
[build]       |                       ^~~~~~~~~~~~
[build] ninja: build stopped: subcommand failed.
[proc] The command: /home/ubuntu/.local/bin/cmake --build ./build/vscode --config Debug --target all  -- exited with code: 1
[driver] Build completed: 00:00:01.560
[build] Build finished with exit code 1

> g++-15 --version
g++-15 (Ubuntu 15-20250404-0ubuntu1) 15.0.1 20250404 (experimental) [master r15-9193-g08e803aa9be]
Copyright (C) 2025 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

> g++-14 --version
g++-14 (Ubuntu 14.2.0-19ubuntu2) 14.2.0
Copyright (C) 2024 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

This issue doesn't show up with GCC 14 (the version CI is using). I'm investigating.

Originally posted by @SidneyCogdill in https://github.com/microsoft/proxy/pull/293#discussion_r2090372381