--crate-type=bin causes no_mangle symbols to be ommitted. about rust

[bjorn3]

You need the unstable -Zexport-executable-symbols to export symbols from an executable.

[lolbinarycat]

here's the documentation that makes me believe this behavior is unintentional: https://doc.rust-lang.org/reference/abi.html

i ran into this problem when disassembling a program, but it could also cause issues for some dynamic libraries that expect the program that links against them to define some symbol for configuration.

workaround is to make sure that function is referenced from somewhere else in the program.

[eggyal]

The function is unused/dead code, so it's not being codegen'd (this has nothing to do with no_mangle: it'd be the same for any function). Perhaps you want it to be pub in a library crate?

[workingjubilee]

@lolbinarycat A close examination of the page you reference suggests its definition of "object file" excludes linked binaries, so this does seem to be "working as intended" currently, though the reference is confusingly written on this point.