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Build fails due to symbol redefinition in abseil-cpp when using gRPC v1.72.0 #39592

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BohdanBuinich opened this issue May 17, 2025 · 2 comments
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Build fails due to symbol redefinition in abseil-cpp when using gRPC v1.72.0 #39592

BohdanBuinich opened this issue May 17, 2025 · 2 comments
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@rishesh007
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kind/bug lang/core priority/P2 untriaged

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@BohdanBuinich
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What version of gRPC and what language are you using?

1.72.0

What operating system (Linux, Windows,...) and version?

Ubuntu 24.04

What runtime / compiler are you using (e.g. python version or version of gcc)

gcc (Ubuntu 13.3.0-6ubuntu2~24.04) 13.3.0

What did you do?

Tried building gRPC v1.72.0 using either CPMAddPackage or FetchContent. Compilation fails due to multiple symbol redefinitions in Abseil's time-related sources.
Reproduction Steps:

Using FetchContent:

# Using FetchContent (same issue with CPMAddPackage)
set(protobuf_INSTALL OFF)
set(utf8_range_ENABLE_INSTALL OFF)

FetchContent_Declare(
  gRPC
  GIT_REPOSITORY https://github.com/grpc/grpc
  GIT_TAG v1.72.0
  GIT_SHALLOW TRUE
)
FetchContent_MakeAvailable(gRPC)

add_library(gRPC::grpc++ ALIAS grpc++)
add_executable(gRPC::grpc_cpp_plugin ALIAS grpc_cpp_plugin)

Using CPM:

CPMAddPackage(URI "gh:grpc/grpc@1.72.0" OPTIONS "protobuf_INSTALL OFF" "utf8_range_ENABLE_INSTALL OFF")

add_library(gRPC::grpc++ ALIAS grpc++)
add_executable(gRPC::grpc_cpp_plugin ALIAS grpc_cpp_plugin)

What did you expect to see?

Successful build of gRPC and dependencies without errors.

What did you see instead?

Build fails due to symbol redefinitions caused by Abseil being compiled with unity builds enabled:

[53/490] Building CXX object _deps/grpc-build/third_party/abseil-cpp/absl/time/CMakeFiles/absl_time.dir/Unity/unity_0_cxx.cxx.o
FAILED: _deps/grpc-build/third_party/abseil-cpp/absl/time/CMakeFiles/absl_time.dir/Unity/unity_0_cxx.cxx.o 
/usr/bin/c++  -isystem test_cpp/cmake-build-debug/_deps/grpc-src/third_party/abseil-cpp -g -std=c++20 -fPIC -fdiagnostics-color=always -Wall -Wextra -Wcast-qual -Wconversion-null -Wformat-security -Wmissing-declarations -Wnon-virtual-dtor -Woverlength-strings -Wpointer-arith -Wundef -Wunused-local-typedefs -Wunused-result -Wvarargs -Wvla -Wwrite-strings -DNOMINMAX -MD -MT _deps/grpc-build/third_party/abseil-cpp/absl/time/CMakeFiles/absl_time.dir/Unity/unity_0_cxx.cxx.o -MF _deps/grpc-build/third_party/abseil-cpp/absl/time/CMakeFiles/absl_time.dir/Unity/unity_0_cxx.cxx.o.d -o _deps/grpc-build/third_party/abseil-cpp/absl/time/CMakeFiles/absl_time.dir/Unity/unity_0_cxx.cxx.o -c test_cpp/cmake-build-debug/_deps/grpc-build/third_party/abseil-cpp/absl/time/CMakeFiles/absl_time.dir/Unity/unity_0_cxx.cxx
In file included from test_cpp/cmake-build-debug/_deps/grpc-build/third_party/abseil-cpp/absl/time/CMakeFiles/absl_time.dir/Unity/unity_0_cxx.cxx:16:
test_cpp/cmake-build-debug/_deps/grpc-src/third_party/abseil-cpp/absl/time/time.cc:54:40: error: redefinition of ‘absl::lts_20250127::time_internal::cctz::time_point<std::chrono::duration<long int> > absl::lts_20250127::{anonymous}::unix_epoch()’
   54 | inline cctz::time_point<cctz::seconds> unix_epoch() {
      |                                        ^~~~~~~~~~
In file included from test_cpp/cmake-build-debug/_deps/grpc-build/third_party/abseil-cpp/absl/time/CMakeFiles/absl_time.dir/Unity/unity_0_cxx.cxx:13:
test_cpp/cmake-build-debug/_deps/grpc-src/third_party/abseil-cpp/absl/time/format.cc:47:40: note: ‘absl::lts_20250127::time_internal::cctz::time_point<std::chrono::duration<long int> > absl::lts_20250127::{anonymous}::unix_epoch()’ previously defined here
   47 | inline cctz::time_point<cctz::seconds> unix_epoch() {
      |                                        ^~~~~~~~~~
[54/490] Building CXX object _deps/grpc-build/third_party/abseil-cpp/absl/time/CMakeFiles/absl_time_zone.dir/Unity/unity_0_cxx.cxx.o
FAILED: _deps/grpc-build/third_party/abseil-cpp/absl/time/CMakeFiles/absl_time_zone.dir/Unity/unity_0_cxx.cxx.o 
/usr/bin/c++  -Itest_cpp/cmake-build-debug/_deps/grpc-src/third_party/abseil-cpp -g -std=c++20 -fPIC -fdiagnostics-color=always -Wall -Wextra -Wcast-qual -Wconversion-null -Wformat-security -Wmissing-declarations -Wnon-virtual-dtor -Woverlength-strings -Wpointer-arith -Wundef -Wunused-local-typedefs -Wunused-result -Wvarargs -Wvla -Wwrite-strings -DNOMINMAX -MD -MT _deps/grpc-build/third_party/abseil-cpp/absl/time/CMakeFiles/absl_time_zone.dir/Unity/unity_0_cxx.cxx.o -MF _deps/grpc-build/third_party/abseil-cpp/absl/time/CMakeFiles/absl_time_zone.dir/Unity/unity_0_cxx.cxx.o.d -o _deps/grpc-build/third_party/abseil-cpp/absl/time/CMakeFiles/absl_time_zone.dir/Unity/unity_0_cxx.cxx.o -c test_cpp/cmake-build-debug/_deps/grpc-build/third_party/abseil-cpp/absl/time/CMakeFiles/absl_time_zone.dir/Unity/unity_0_cxx.cxx
In file included from test_cpp/cmake-build-debug/_deps/grpc-build/third_party/abseil-cpp/absl/time/CMakeFiles/absl_time_zone.dir/Unity/unity_0_cxx.cxx:25:
test_cpp/cmake-build-debug/_deps/grpc-src/third_party/abseil-cpp/absl/time/internal/cctz/src/time_zone_posix.cc:31:12: error: redefinition of ‘const char absl::lts_20250127::time_internal::cctz::{anonymous}::kDigits []’
   31 | const char kDigits[] = "0123456789";
      |            ^~~~~~~
In file included from test_cpp/cmake-build-debug/_deps/grpc-build/third_party/abseil-cpp/absl/time/CMakeFiles/absl_time_zone.dir/Unity/unity_0_cxx.cxx:4:
test_cpp/cmake-build-debug/_deps/grpc-src/third_party/abseil-cpp/absl/time/internal/cctz/src/time_zone_fixed.cc:35:12: note: ‘const char absl::lts_20250127::time_internal::cctz::{anonymous}::kDigits [11]’ previously defined here
   35 | const char kDigits[] = "0123456789";
      |            ^~~~~~~
@rishesh007
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@BohdanBuinich you have to set this before declaring anything using abseil

set(ABSL_ENABLE_INSTALL ON CACHE BOOL "" FORCE)

@BohdanBuinich
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@rishesh007 Apologies, it was my mistake. I had enabled Unity builds in CMake using:

set(CMAKE_UNITY_BUILD ON)

This caused the build to fail because multiple translation units were combined, leading to conflicts. Disabling Unity builds resolved the issue.

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