问题
I want to link an external static lib in one of my bazel based c++ project. I need "whole-archive" option for linking the library like gcc or g++ build:
g++ main.cc -Wl,--whole-archive -lhttp -Wl,--no-whole-archive
Can anybody suggest what is the alternate to "--whole-archive" in bazel?
回答1:
Sadly, alwayslink doesn't work with precompiled libraries, only with cc_library compiled and linked by Bazel. There is one undocumented hack (I guess I'm just documenting it by mentioning it here), and it's to rename .a file to .lo file. Then Bazel will link it as whole archive.
Beware that this is a hack, and will stop working without warning. We have plans for some variation of cc_import rule exactly for this use case, to import a precompiled binary into the workspace with the ability to set whole archiveness on it. It's just not there yet.
回答2:
https://bazel.build/versions/master/docs/be/c-cpp.html#cc_library.alwayslink
alwayslink
Boolean; optional; nonconfigurable; default is 0
If 1, any binary that depends (directly or indirectly) on this C++ library will link in all the object files for the files listed in srcs, even if some contain no symbols referenced by the binary. This is useful if your code isn't explicitly called by code in the binary, e.g., if your code registers to receive some callback provided by some service.
来源：https://stackoverflow.com/questions/44674163/alternate-to-whole-archive-in-bazel