Failed to build with external abseil-cpp #1065
Description
It's simple to understand so I didn't follow the template.
The opentelemetry-cpp vendor parts of the absl source code within the API but without change the namespace. If I build a cpp target included both opentelementry-cpp & abseil-cpp, it would occurred an error (build with bazel & llvm-13):
external/com_google_absl/absl/meta/type_traits.h:162:8: error: redefinition of 'is_detected_convertible_impl<typename std::enable_if<std::is_convertible<Op<Args...>, To>::value>::type, To, Op, Args...>'
struct is_detected_convertible_impl<
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
bazel-out/k8-fastbuild/bin/external/io_opentelemetry_cpp/api/_virtual_includes/api/opentelemetry/nostd/./absl/types/../types/internal/../../meta/type_traits.h:154:8: note: previous definition is here
struct is_detected_convertible_impl<
^
The critical rule is to use an alternative namespace than the original namespace absl when vendoring any source code.