Ryan Prichard acf8b0ff00
Stop linking libdl.a into static bins ...
libdl.a has a no-op dlopen, which breaks static libraries that need a real
dlopen. Instead of automatically linking libdl.a into static executables,
make it optional.
Until recently, the libunwind_llvm.a unwinder, used on arm32, needed the
no-op dladdr, but it's now built using -D_LIBUNWIND_USE_DLADDR=0.
The HWASan run-time uses dlsym and dladdr, so add a libdl dependency for
HWASan-built static binaries. We could also remove the dependency from
libclang_rt.hwasan_static-*.a, but this is also easy to do.
Bug: http://b/141485154
Test: bionic unit tests, device boots, verify that static and dynamic
executables can throw/catch an exception
Test: verify that a static executable using dlopen doesn't link (unless it
adds an explicit dependency on libdl)
Change-Id: Id26741f79dca50256a2dc23453af3026a6c88dca
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