GoogleMock segfaults if built with option "-D gtest_disable_pthreads=ON"

[ingo-h]

Describe the bug

I built GoogleTest without pthread on Linux and successful compile tests with it using mocks. When running these tests all of them crash with a final message "Segmentation fault". They should pass.

Steps to reproduce the bug

I cloned GoogleTest and stay in its root directory. Here I use this simple test program:

~$ cat test_simple.cpp
#include "gmock/gmock.h"
#include "gtest/gtest.h"

// simple mocked class
// -------------------
class Foo {
    virtual int GetInt() const = 0;
};

class MockFoo : public Foo {
  public:
    MOCK_METHOD(int, GetInt, (), (const, override));
};

// simple testsuite
//-----------------
TEST(simpleTestSuite, simpleMockTest) {
    MockFoo mockedFoo;

    EXPECT_CALL(mockedFoo, GetInt()).Times(1);
    EXPECT_EQ(mockedFoo.GetInt(), 0);
}

// main entry
// ----------
int main(int argc, char** argv) {
    ::testing::InitGoogleTest(&argc, argv);
    return RUN_ALL_TESTS();
}

Now verify that it runs successful with default configure/build of GoogleTest:

~$ cmake -S . -B build
~$ cmake --build build

and compile the simple test:

~$ g++ -std=c++11 -otest_simple -I./googletest/include/ -I./googlemock/include/ ./test_simple.cpp ./build/lib/libgtest.a ./build/lib/libgmock.a -lpthread

run it:

~$ ./test_simple
[==========] Running 1 test from 1 test suite.
[----------] Global test environment set-up.
[----------] 1 test from simpleTestSuite
[ RUN      ] simpleTestSuite.simpleMockTest
[       OK ] simpleTestSuite.simpleMockTest (0 ms)
[----------] 1 test from simpleTestSuite (0 ms total)

[----------] Global test environment tear-down
[==========] 1 test from 1 test suite ran. (0 ms total)
[  PASSED  ] 1 test.

So far so good. Now build GoogleTest with option -D gtest_disable_pthreads=ON and compile the simple test:

~$ rm -rf build
~$ cmake -S . -B build -D gtest_disable_pthreads=ON
~$ cmake --build build

On compiling the simple test I do not need option -lpthread of course.

 ~$ g++ -std=c++11 -otest_simple -I./googletest/include/ -I./googlemock/include/ ./test_simple.cpp ./build/lib/libgtest.a ./build/lib/libgmock.a
/usr/bin/ld: /tmp/ccGIohZm.o: in function `testing::internal::ThreadLocal<testing::Sequence*>::GetOrCreateValue() const':
test_simple.cpp:(.text._ZNK7testing8internal11ThreadLocalIPNS_8SequenceEE16GetOrCreateValueEv[_ZNK7testing8internal11ThreadLocalIPNS_8SequenceEE16GetOrCreateValueEv]+0x16): undefined reference to `pthread_getspecific'
/usr/bin/ld: test_simple.cpp:(.text._ZNK7testing8internal11ThreadLocalIPNS_8SequenceEE16GetOrCreateValueEv[_ZNK7testing8internal11ThreadLocalIPNS_8SequenceEE16GetOrCreateValueEv]+0x79): undefined reference to `pthread_setspecific'
collect2: error: ld returned 1 exit status

Huh? Why that? Ok, appended -lpthread again, compile and run the test:

~$ ./test_simple
[==========] Running 1 test from 1 test suite.
[----------] Global test environment set-up.
[----------] 1 test from simpleTestSuite
[ RUN      ] simpleTestSuite.simpleMockTest
Segmentation fault

Does the bug persist in the most recent commit?

Yes.

What operating system and version are you using?

~$ cat /etc/os-release
PRETTY_NAME="Debian GNU/Linux 11 (bullseye)"
NAME="Debian GNU/Linux"
VERSION_ID="11"
VERSION="11 (bullseye)"
VERSION_CODENAME=bullseye
ID=debian
HOME_URL="https://www.debian.org/"
SUPPORT_URL="https://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/"

What compiler and version are you using?

~$ g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/10/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none:amdgcn-amdhsa:hsa
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 10.2.1-6' --with-bugurl=file:///usr/share/doc/gcc-10/README.Bugs --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++,m2 --prefix=/usr --with-gcc-major-version-only --program-suffix=-10 --program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --enable-bootstrap --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-plugin --enable-default-pie --with-system-zlib --enable-libphobos-checking=release --with-target-system-zlib=auto --enable-objc-gc=auto --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-offload-targets=nvptx-none=/build/gcc-10-Km9U7s/gcc-10-10.2.1/debian/tmp-nvptx/usr,amdgcn-amdhsa=/build/gcc-10-Km9U7s/gcc-10-10.2.1/debian/tmp-gcn/usr,hsa --without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu --with-build-config=bootstrap-lto-lean --enable-link-mutex
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 10.2.1 20210110 (Debian 10.2.1-6)

What build system are you using?

~$ cmake --version
cmake version 3.18.4

CMake suite maintained and supported by Kitware (kitware.com/cmake).

Additional context

This should be seen in context with #3577

[Toptachamann]

Hello,
I was able to reproduce the same bug on

~$ cat /etc/os-release
NAME="Ubuntu"
VERSION="20.04.4 LTS (Focal Fossa)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 20.04.4 LTS"
VERSION_ID="20.04"
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
VERSION_CODENAME=focal
UBUNTU_CODENAME=focal

Are there any updates on this issue?