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Optimize libcxx-version for faster bootstrap startups #126467

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Optimize libcxx-version for faster bootstrap startups #126467

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13 changes: 8 additions & 5 deletions src/tools/libcxx-version/main.cpp
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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;
}
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