gtest/[0.13.0, 0.14.0]: Undefined references to "basic_string" on clang-17 with "compiler.libcxx=libstdc++11" #22547
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Hello @matheusgomes28 ! It's not totally clear how you are consuming the Conan package. Your profile looks okay, but how do you consume that library? Please, make sure you are using |
uilianries
added
Feedback please!
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@uilianries sorry if it wasn't clear. I am using I've used Conan before and am familiar with the ABI issue, but can't seem to fix here 😕 For context, I am building this on a CI in this branch of my project |
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@matheusgomes28 Could you please point the exact link to the build that's failing? So I can have a better view. Plus, you should prefer https://docs.conan.io/2/reference/conanfile_txt.html#test-requires |
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@uilianries I can, its the "Ubuntu Debug" build that builds unit tests. However, don't worry about that, I think it's counter productive trying to understand my CI pipeline. I've made a minimal reproducible project that also fails. Firstly, install the Project File Setup (all same dir)CMakeLists.txt: cmake_minimum_required(VERSION 3.25)
project(ConanGtest LANGUAGES CXX)
set(CMAKE_CXX_STANDARD 20)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)
find_package(GTest REQUIRED)
add_executable(tests main.cpp)
target_link_libraries(tests PRIVATE GTest::gtest)main.cpp: #include <gtest/gtest.h>
#include <string>
// NOLINTNEXTLINE
TEST(MyTestCase, MyTestName)
{
std::string const expected{"Hello World!"};
ASSERT_EQ(expected, "Hello World!");
}
int main(int argc, char** argv)
{
testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}conanfile.txt [requires]
gtest/1.13.0
[generators]
CMakeDeps
CMakeToolchainCommands Used to BuildConan dependency install CC="clang-17" CXX="clang-17" conan install . -of "conan/deb" -sbuild_type=Debug --build=missingCMake configure cmake -DCMAKE_TOOLCHAIN_FILE="conan/deb/conan_toolchain.cmake" -DCMAKE_CXX_COMPILER="clang-17" -DCMAKE_BUILD_TYPE="Debug" -DCMAKE_CXX_COMPILER="clang-17" . -BbuildCMake build cmake --build ./buildAnd you should get the linking errors on the build stage. Note that I have used the same profile as mentioned before. |
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@matheusgomes28 It's working fine for me: Some important considerations:
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@uilianries Thank you very much for trying it out and providing your workflow. I figured the issue is the Is there a reason why Conan supports
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@matheusgomes28 Now I see your error, is about C++20, not C++17 like you described in your Conan profile in this issue description!!!
Not true!! I'll explain: There is another related issue (spdlog) with same error somewhere (I couldn't find). The thing is: You are consuming the pre-built binary of GTest from Conan Center. It was built using C++14, which Conan takes as ABI compatible. However, there is a breaking in C++20 that does not make it compatible (it works for C++17). Right now, we have a new feature to Conan (conan-io/conan#15348) to make it incompatible between C++14 and C++20. You have to do: Build GTest from sources It will cache a new package of Gtest, using your defined compiler.cppstd. |
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@uilianries I had built from source as well with the std set to 20 in the profile before btw, but no luck. I'll run a few more tests after work and I'll port the findings here! I.e. I was not consuming a pre built package, I also tried |
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@matheusgomes28 It should work, if you are doing it locally, please remove all your cache related to gtest: |
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@uilianries Confirmed locally, works on |
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@matheusgomes28 Thank you for your feedback 😸 |
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Description
Linking Google Test with Clang 17 does not seem to be working, we get the errors shown in the logs.
Obviously, I am well aware of the many issues reported regarding the
std::basic_stringABI differences between building withlibstd++andlibstdc++11. But even after setting compiler.libcxx=libstdc++11 it does NOT work when linking the lib to a binary.I've also tried to manually tweek the
_GLIBCXX_USE_CXX11_ABI, but no fixes so far.Is this a bug, or am I missing something?
Package and Environment Details
General Info
Environment Variables Defined
Conan profile
======== Input profiles ========
Profile host:
[settings]
arch=x86_64
build_type=Debug
compiler=clang
compiler.cppstd=17
compiler.libcxx=libstdc++11
compiler.version=17
os=Linux
Profile build:
[settings]
arch=x86_64
build_type=Debug
compiler=clang
compiler.cppstd=17
compiler.libcxx=libstdc++11
compiler.version=17
os=Linux
Steps to reproduce
helper script used (called
conan-install.sh):So I'm calling the script above with
COMPILER="clang" COMPILER_VERSION="17" COMPILER_CPPSTD="20" COMPILER_LIBCXX="libstdc++11" ./scripts/helpers/conan-install.shLogs
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