Fix some compilation issues on modern macOS systems #6709
Merged
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Apple clang 15 doesn't like some of our coding practices, notably some use of:
where we're not interested in the return values, just the side-effects of the lambda functions. This PR adds dummy variables to hold the results, and marks them as
[[maybe_unused]]
, which appeases the compiler.I've also thrown in a workaround to boostorg/phoenix#111 which is preventing things from building when compiled against Boost 1.8x, which is the current version available in Homebrew on macOS.
I haven't actually tested anything here, I just know it all compiles cleanly on my Apple M1 machine now.
Should address most of #6707 - I didn't observe the issues with
std::unary_function
when using Boost 1.8x