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The c++tools configure fragments need to be built with a C++ compiler. In addition, the stand-alone server uses diagnostic mechanisms in common with GCC, but needs to define implementations for gcc_assert and supporting output functions. Signed-off-by: Iain Sandoe <iain@sandoe.co.uk> PR c++/98821 - modules : c++tools configures with CC but code fragments assume CXX. PR c++/98821 c++tools/ChangeLog: * config.h.in: Regenerate. * configure: Regenerate. * configure.ac: Configure using C++. Pull logic to detect enabled checking modes; default to release checking. * server.cc (AI_NUMERICSERV): Define a fallback value. (gcc_assert): New. (gcc_unreachable): New. (fancy_abort): Only build when checking is enabled. Co-authored-by: Jakub Jelinek <jakub@redhat.com>