Pass file's path when trying to export all symbols

[01Pollux]

Is your feature request related to a problem? Please describe.

Currently, there is no way to know the file path from which a symbol was exported.

Describe the solution you'd like

It would be useful to have a way to export all symbols from files inside the 'Public/' directory, for example. The pseudocode could look like this:

target("bar")
    set_kind("shared")
    add_files("src/bar.cpp")
    add_rules("utils.symbols.export_all", {export_filter = function (symbol, path)
        if path:find("Public/", 1, true) then
            return true
        end
    end})

Describe alternatives you've considered

No response

Additional context

No response

[waruqi]

If we pass sourcefile as path, the implementation is very complicated and it is not very accurate. This is because some rules automatically generate objectfiles and do not save the corresponding sourcefiles.

So I think it might be better and more accurate to pass objectfile as the path.

[waruqi]

try this patch. https://github.com/xmake-io/xmake/pull/5608

target("bar")
    set_kind("shared")
    add_files("src/bar.cpp")
    add_rules("utils.symbols.export_all", {export_filter = function (symbol, opt)
        local filepath = opt.sourcefile or opt.objectfile
        if filepath and filepath:find("bar.cpp", 1, true) and symbol:find("add", 1, true) then
            print("export: %s at %s", symbol, filepath)
            return true
        end
    end})