C++: Fix build on no-except compilers #1174
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…compiler does not support exceptions.
riidefi
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RUST_CXX_NO_EXCEPTIONS panic backend if exceptions are unsupported.
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This fix was necessary for my project (C++ depending on Rust) to compile. The approach here is conservative, only deferring from the existing behavior when the compiler explicitly does not support exceptions via feature-test macros. There may be other approaches here, like attempting to compile a test file with
throw.