https://gcc.gnu.org/g:cb29396e67f5e2622e31bf83f253c6d66c51135d commit r13-2752-gcb29396e67f5e2622e31bf83f253c6d66c51135d Author: Jonathan Wakely <jwakely@redhat.com> Date: Wed Sep 21 00:48:12 2022 +0100 libstdc++: Add _Exit to <stdlib.h> for freestanding When I added std::_Exit to the freestanding declarations in <cstdlib> I should also have added it to <stdlib.h>. libstdc++-v3/ChangeLog: * include/c_compatibility/stdlib.h [!_GLIBCXX_HOSTED]: Add using-declaration for _Exit. Diff: --- libstdc++-v3/include/c_compatibility/stdlib.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/libstdc++-v3/include/c_compatibility/stdlib.h b/libstdc++-v3/include/c_compatibility/stdlib.h index 377b9107ded..70fa4c8e503 100644 --- a/libstdc++-v3/include/c_compatibility/stdlib.h +++ b/libstdc++-v3/include/c_compatibility/stdlib.h @@ -45,6 +45,9 @@ using std::exit; # ifdef _GLIBCXX_HAVE_QUICK_EXIT using std::quick_exit; # endif +# if _GLIBCXX_USE_C99_STDLIB + using std::_Exit; +# endif #endif #if _GLIBCXX_HOSTED