Build with external abseil not working, ambiguous references

[maxlein]

Describe your environment Ubuntu 22.04 CMake build

I want to add tracing to my already existing app where we also use and link against grpc/abseil.

Steps to reproduce

I made a little install script for otel:

#!/bin/bash

mkdir -p build 
cd build

cmake -DBUILD_TESTING:BOOL=OFF \
    -DBUILD_SHARED_LIBS:BOOL=ON \
    -DCMAKE_POSITION_INDEPENDENT_CODE:BOOL=ON \
    -DWITH_JAEGER:BOOL=OFF \
    -DWITH_OTLP_HTTP:BOOL=OFF \
    -DWITH_OTLP_GRPC:BOOL=OFF \
    -DWITH_PROMETHEUS:BOOL=OFF \
    -DWITH_ZIPKIN:BOOL=OFF \
    -DWITH_EXAMPLES:BOOL=OFF \
    -DOTELCPP_VERSIONED_LIBS:BOOL=ON \
    -DBUILD_PACKAGE=ON \
    -DWITH_ABSEIL=ON \
    -DWITH_STL=ON \
    -DCMAKE_PREFIX_PATH=/usr/alpen \
    ..

cmake --build .

cpack

and I added some output to see if otel finds my installed version of abseil:

if(WITH_ABSEIL)
  if(NOT TARGET absl::strings)
    find_package(absl CONFIG REQUIRED)
    message(STATUS "Found Abseil: ${absl_DIR}")
  else ()
    message(STATUS "Using external Abseil")
  endif()
endif()

Output: Found Abseil: /usr/alpen/lib/cmake/absl

Then in my app I created a little testing lib to see if it will build:

find_package(opentelemetry-cpp CONFIG REQUIRED)

add_library(tracer_lib SHARED src/tracer_common.cpp)
target_include_directories(tracer_lib PUBLIC
        $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
        $<INSTALL_INTERFACE:include>)
target_link_libraries(tracer_lib PUBLIC
        ${COMMON_LIBS}
        ${OPENTELEMETRY_CPP_LIBRARIES}
)
set_property(TARGET tracer_lib PROPERTY POSITION_INDEPENDENT_CODE 1)

#include <grpcpp/grpcpp.h>
#include "msg/task_service.grpc.pb.h"

namespace grpc::tracing
{
class TaskServer : public grpc::task::TaskService::Service

...

But when compile I always get this error: reference to ‘base_internal’ is ambiguous

What is the expected behavior? I can build without interfering header files from different abseil libs.

What is the actual behavior?

I see this error:

from /home/XXX/alpen/service_lib/tests/tracing/server.cpp:5:
/usr/alpen/include/absl/synchronization/internal/per_thread_sem.h:80:47: error: reference to ‘base_internal’ is ambiguous

/usr/include/opentelemetry/nostd/internal/absl/base/internal/invoke.h:49:11: note: candidates are: ‘namespace absl::otel_v1::base_internal { }’

/usr/alpen/include/absl/base/internal/low_level_alloc.h:59:11: note:                 ‘namespace absl::lts_20220623::base_internal { }’

Additional context

I looked at the hints here, but they had no effect.