Export php binary external debug symbol files

[crazywhalecc]

What does this PR do?

Closes #949

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[henderkes]

I think we should refactor the debug copy out to its own function and put it in buildroot/debug. And of course also do it for shared libs.

[crazywhalecc]

I think we should refactor the debug copy out to its own function and put it in buildroot/debug. And of course also do it for shared libs.

I'm not quite sure if it's necessary to generate both of them simultaneously. But I think we could just keep the unstripped version in source. That is, strip after copy. WDYT?

[henderkes]

No, it should behave the same way for all binaries.
My idea is to create a function:

function extractDebugInfo($path) {
     $file = filename($path);
     $dir = basename($path);
     shell()->cd($dir)
          ->exec("objcopy ---only-debug-info $file $file.debug");
     ...
     mv($file . '.debug', BUILD_DEBUG_PATH);
}

And then call that for every binary in BIN/LIB/MODULES paths.

[crazywhalecc]

And then call that for every binary in BIN/LIB/MODULES paths.

It looks impossible for current situation, we have no defines for the executables that should be stripped. But we could separate functions stripBinary(), extractDebugInfo() and deployBinary() and call them when needed.

[henderkes]

Looks good now, but we still need to call extractDebugInfo() on all *.so files in BUILD_LIB_PATH and BUILD_MODULES_PATH.

[henderkes]

Looks good now, I'll spin it up tonight.