Skip to content

Optimize libcxx-version for faster bootstrap startups #126467

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Closed
wants to merge 1 commit into from
Closed

Optimize libcxx-version for faster bootstrap startups #126467

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
13 changes: 8 additions & 5 deletions src/tools/libcxx-version/main.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -5,22 +5,25 @@
// It's nothing more than specifying the name of the standard library implementation (either libstdc++ or libc++)
// and its major version.

#include <iostream>
#include <cstdio>

int main() {
#ifdef _GLIBCXX_RELEASE
std::cout << "libstdc++ version: " << _GLIBCXX_RELEASE << std::endl;
#define name "libstdc++"
#define version _GLIBCXX_RELEASE
#elif defined(_LIBCPP_VERSION)
// _LIBCPP_VERSION follows "XXYYZZ" format (e.g., 170001 for 17.0.1).
// ref: https://github.com/llvm/llvm-project/blob/f64732195c1030ee2627ff4e4142038e01df1d26/libcxx/include/__config#L51-L54
//
// Since we use the major version from _GLIBCXX_RELEASE, we need to extract only the first 2 characters of _LIBCPP_VERSION
// to provide the major version for consistency.
std::cout << "libc++ version: " << std::to_string(_LIBCPP_VERSION).substr(0, 2) << std::endl;
#define name "libc++"
#define version _LIBCPP_VERSION / 10000
#else
std::cerr << "Coudln't recognize the standard library version." << std::endl;
return 1;
#error "Couldn't recognize the standard library version."
#endif

printf("%s version: %d\n", name, version);

return 0;
}