[Bug 255123] cmake compiler test fails with pthread

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255123

--- Comment #4 from Mohammad S. Babaei <info at babaei.net> ---
This is the simplest program I can reproduce it with:

$ cat main.cpp

int main()
{
        return 0
}


$ cat CMakeLists.txt

cmake_minimum_required(VERSION 3.14...3.20)

project(Barandazstorm
    VERSION 0.0.0
    DESCRIPTION "A Twitter analysis tool dedicated to #IranRegimeChange"
    HOMEPAGE_URL "https://twitter.com/Barandazstorm"
    LANGUAGES C CXX
)

set(THREADS_PREFER_PTHREAD_FLAG TRUE)
find_package(Threads REQUIRED)

add_executable(hello main.cpp)

target_link_libraries(hello
    PRIVATE
    Threads::Threads
)


$ cmake -GNinja -S . -B build

-- The C compiler identification is Clang 10.0.1
-- The CXX compiler identification is Clang 10.0.1
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Looking for pthread.h
-- Looking for pthread.h - found
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Failed
-- Check if compiler accepts -pthread
-- Check if compiler accepts -pthread - yes
-- Found Threads: TRUE  
-- Configuring done
-- Generating done
-- Build files have been written to: /usr/home/mamadou/test-cmake/build


$ cat build/CMakeFiles/CMakeError.log

Performing C SOURCE FILE Test CMAKE_HAVE_LIBC_PTHREAD failed with the following
output:
Change Dir: /usr/home/mamadou/test-cmake/build/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/local/bin/ninja cmTC_230ca && [1/2] Building C object
CMakeFiles/cmTC_230ca.dir/src.c.o
[2/2] Linking C executable cmTC_230ca
FAILED: cmTC_230ca 
: && /usr/bin/cc   CMakeFiles/cmTC_230ca.dir/src.c.o -o cmTC_230ca   && :
ld: error: undefined symbol: pthread_create
>>> referenced by src.c
>>>               CMakeFiles/cmTC_230ca.dir/src.c.o:(main)
cc: error: linker command failed with exit code 1 (use -v to see invocation)
ninja: build stopped: subcommand failed.


Source file was:
#include <pthread.h>

static void* test_func(void* data)
{
  return data;
}

int main(void)
{
  pthread_t thread;
  pthread_create(&thread, NULL, test_func, NULL);
  pthread_detach(thread);
  pthread_cancel(thread);
  pthread_join(thread, NULL);
  pthread_atfork(NULL, NULL, NULL);
  pthread_exit(NULL);

  return 0;
}

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