cc_library uses object files of static library

[andreash...@gmail.com]

I'm trying to build a C++ node add-on and detected different behavior while linking on mac and linux. mac uses the static linked '.a' for dependencies but with linux the linker command uses a parameter file containing all object files of the dependencies. this causes come duplicated symbol problems. I tried to edit the Crosstool feature 'libraries_to_link'

```
flag_group {
flag_group {
flag: "-Wl,--start-lib"
expand_if_equal {
variable: "libraries_to_link.type"
value: "object_file_group"
}
}
flag_group {
flag_group {
flag: "%{libraries_to_link.object_files}"
expand_if_false: "libraries_to_link.is_whole_archive"
}
flag_group {
flag: "-Wl,-force_load,%{libraries_to_link.object_files}"
expand_if_true: "libraries_to_link.is_whole_archive"
}
iterate_over: "libraries_to_link.object_files"
expand_if_equal {
variable: "libraries_to_link.type"
value: "object_file_group"
}
}
flag_group {
flag: "-Wl,--end-lib"
expand_if_equal {
variable: "libraries_to_link.type"
value: "object_file_group"
}
}
}
```

but i think at this point it is to late to use the static libraries instead of the object files.

Does anyone know how to fix this?

[Marcel Hlopko]

Hi Andreas,

Objects should be wrapped in --start-lib --end-lib block, which makes gold linker treat them as if they were in a .a archive. Can you isolate (even without bazel, just gcc/gold invocations) the problem so I can take a look what you mean?

Quick and dirty "fix" would be to uninstall gold, run bazel clean --expunge, and see if it's fixed (bfd ld doesn't support --start-lib --end-lib so bazel will produce proper .a).

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Marcel Hlopko | Software Engineer | hlo...@google.com | 

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