'SpanContext' is not a member of 'opentelemetry::v1::sdk::trace'

[qinyeli]

I am trying to add the OpenTelemetry SDK as a dependency into our project, and I am consistently hitting this compile issue.

Describe your environment Describe any aspect of your environment relevant to the problem, including your platform, build system, version numbers of installed dependencies, etc. If you're reporting a problem with a specific version of a library in this repo, please check whether the problem has been fixed on main branch.

• CentOS in Parallel 18
• The latest release opentelemetry-cpp-1.12.0.tar.gz downloaded

Steps to reproduce
Describe exactly how to reproduce the error. Include a code sample if applicable.

When I include certain dependencies from metrics SDK, for example any of the following

#include <opentelemetry/sdk/metrics/export/periodic_exporting_metric_reader_factory.h>
#include <opentelemetry/sdk/metrics/meter.h>
#include <opentelemetry/sdk/metrics/meter_provider.h>
#include <opentelemetry/sdk/metrics/meter_provider_factory.h>

and compile with either Bazel or CMake, I get compile error.

My Makefile:

build: download-src
	${MKDIR_P} build
	cd build && \
	${CMAKE} -DCMAKE_INSTALL_PREFIX=../installed \
		-DCMAKE_CXX_STANDARD=17 \
		-DWITH_STL=CXX17 \
		-DWITH_ABSEIL=ON \
		-Dabsl_ROOT=../../abseil/installed \
		-DBUILD_TESTING=OFF \
		../src

Bazel targets includes the following targets in the dependency

        "@io_opentelemetry_cpp//api",
        "@io_opentelemetry_cpp//exporters/ostream:ostream_metric_exporter",
        "@io_opentelemetry_cpp//exporters/ostream:ostream_span_exporter",
        "@io_opentelemetry_cpp//sdk:headers",
        "@io_opentelemetry_cpp//sdk/src/metrics",
        "@io_opentelemetry_cpp//sdk/src/trace",
        "@opentelemetry-protos//:otel_exporter_protos",

What is the expected behavior?
That it compiles.

What is the actual behavior?
What did you see instead?

bazel-out/aarch64-fastbuild/bin/external/io_opentelemetry_cpp/sdk/_virtual_includes/headers/opentelemetry/sdk/metrics/data/exemplar_data.h:29:53: error: 'SpanContext' is not a member of 'opentelemetry::v1::sdk::trace'
   29 |   static ExemplarData Create(std::shared_ptr<trace::SpanContext> context,
      |                                                     ^~~~~~~~~~~
bazel-out/aarch64-fastbuild/bin/external/io_opentelemetry_cpp/sdk/_virtual_includes/headers/opentelemetry/sdk/metrics/data/exemplar_data.h:29:64: error: template argument 1 is invalid
   29 |   static ExemplarData Create(std::shared_ptr<trace::SpanContext> context,
      |                                                                ^
bazel-out/aarch64-fastbuild/bin/external/io_opentelemetry_cpp/sdk/_virtual_includes/headers/opentelemetry/sdk/metrics/data/exemplar_data.h:50:16: error: 'SpanContext' in namespace 'opentelemetry::v1::sdk::trace' does not name a type
   50 |   const trace::SpanContext &GetSpanContext() const noexcept { return context_; }

Additional context

Compiling with these header files would work properly

#include <opentelemetry/exporters/ostream/metric_exporter_factory.h>
#include <opentelemetry/exporters/ostream/span_exporter_factory.h>
#include <opentelemetry/metrics/provider.h>
#include <opentelemetry/sdk/metrics/aggregation/default_aggregation.h>
#include <opentelemetry/sdk/metrics/aggregation/histogram_aggregation.h>
#include <opentelemetry/sdk/metrics/push_metric_exporter.h>
#include <opentelemetry/sdk/metrics/view/instrument_selector_factory.h>
#include <opentelemetry/sdk/metrics/view/meter_selector_factory.h>
#include <opentelemetry/sdk/metrics/view/view_factory.h>
#include <opentelemetry/sdk/trace/exporter.h>
#include <opentelemetry/sdk/trace/processor.h>
#include <opentelemetry/sdk/trace/simple_processor_factory.h>
#include <opentelemetry/sdk/trace/tracer_provider_factory.h>
#include <opentelemetry/trace/provider.h>
#include <opentelemetry/trace/span_context.h>

I can even compile with a declaration of SpanContext

   std::shared_ptr<opentelemetry::v1::trace::SpanContext> context;

I have been wrestling with it for a while and I'd appreciate some help.

[sfc-gh-sgiesecke]

This seems to be a bug in several opentelemetry/sdk headers which fail to use fully qualified namespaces when referencing opentelemetry::trace::SpanContext.