[CI] build examples with IWYU (open-telemetry#3450)

Author: marcalff

.github/workflows/iwyu.yml

@@ -53,6 +53,8 @@ jobs:
             -DWITH_STL=CXX14 \
             -DCMAKE_CXX_INCLUDE_WHAT_YOU_USE="include-what-you-use;-w;-Xiwyu;--mapping_file=${TOPDIR}/.iwyu.imp;" \
             -DBUILD_TESTING=ON \
+            -DWITH_EXAMPLES=ON \
+            -DWITH_EXAMPLES_HTTP=ON \
             -DBUILD_W3CTRACECONTEXT_TEST=ON \
             -DWITH_OTLP_GRPC=ON \
             -DWITH_OTLP_HTTP=ON \

examples/http/client.cc

@@ -1,12 +1,30 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
+#include "opentelemetry/context/propagation/global_propagator.h"
+#include "opentelemetry/context/propagation/text_map_propagator.h"
+#include "opentelemetry/context/runtime_context.h"
+#include "opentelemetry/ext/http/client/http_client.h"
 #include "opentelemetry/ext/http/client/http_client_factory.h"
 #include "opentelemetry/ext/http/common/url_parser.h"
+#include "opentelemetry/nostd/function_ref.h"
+#include "opentelemetry/nostd/shared_ptr.h"
+#include "opentelemetry/nostd/string_view.h"
 #include "opentelemetry/semconv/http_attributes.h"
 #include "opentelemetry/semconv/url_attributes.h"
+#include "opentelemetry/trace/span.h"
+#include "opentelemetry/trace/span_metadata.h"
+#include "opentelemetry/trace/span_startoptions.h"
+#include "opentelemetry/trace/tracer.h"
 #include "tracer_common.h"
 
+#include <stdint.h>
+#include <stdlib.h>
+#include <map>
+#include <string>
+#include <type_traits>
+#include <utility>
+
 namespace
 {
 

examples/http/server.cc

@@ -1,16 +1,31 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#include "server.h"
+#include "opentelemetry/context/propagation/global_propagator.h"
+#include "opentelemetry/context/propagation/text_map_propagator.h"
+#include "opentelemetry/context/runtime_context.h"
+#include "opentelemetry/nostd/shared_ptr.h"
+#include "opentelemetry/nostd/variant.h"
 #include "opentelemetry/semconv/client_attributes.h"
 #include "opentelemetry/semconv/incubating/http_attributes.h"
 #include "opentelemetry/semconv/server_attributes.h"
 #include "opentelemetry/semconv/url_attributes.h"
 #include "opentelemetry/trace/context.h"
+#include "opentelemetry/trace/scope.h"
+#include "opentelemetry/trace/span.h"
+#include "opentelemetry/trace/span_context.h"
+#include "opentelemetry/trace/span_metadata.h"
+#include "opentelemetry/trace/span_startoptions.h"
+#include "opentelemetry/trace/tracer.h"
 #include "tracer_common.h"
 
+#include <stdlib.h>
+#include <chrono>
 #include <iostream>
+#include <map>
 #include <thread>
+#include <utility>
+#include "server.h"
 
 namespace
 {

examples/http/server.h

@@ -2,9 +2,12 @@
 // SPDX-License-Identifier: Apache-2.0
 
 #pragma once
+
+#include "opentelemetry/ext/http/server/http_server.h"
+
+#include <stdint.h>
 #include <atomic>
 #include <string>
-#include "opentelemetry/ext/http/server/http_server.h"
 
 namespace
 {