…compile_commands.json for compilers which support it (clang), to enable Language Server Protocol (LSP) inspection of the sources. This is probably not terribly useful without the --disable-amalgamation flag, as the amalgamation is so large as to make IDE/LSP processing very slow.

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… do not assume that clang automatically supports -MJ for compile-commands output. i.e. make --compile-commands completely opt-in instead of sometimes-assumed.

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