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link管理  ›  [SOLVED] CMake add_package problem / Newbie Corner / Arch Linux Forums
gcc cmake gnu linux绯荤粺
https://bbs.archlinux.org/viewtopic.php?id=238931
老实的人字拖
1 年前

[SOLVED] CMake add_package problem

Hello,
I am unable to create a cmake project.
To be specific add_package( Threads ) throws an error. 


[z3lt-lu@Arch thread]$ cmake ./
CMake Error at /usr/share/cmake-3.11/Modules/FindPackageHandleStandardArgs.cmake:137 (message):
  Could NOT find Threads (missing: Threads_FOUND)
Call Stack (most recent call first):
  /usr/share/cmake-3.11/Modules/FindPackageHandleStandardArgs.cmake:378 (_FPHSA_FAILURE_MESSAGE)
  /usr/share/cmake-3.11/Modules/FindThreads.cmake:205 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
  CMakeLists.txt:10 (find_package)
-- Configuring incomplete, errors occurred!
See also "/home/z3lt/Code/Cpp/thread/CMakeFiles/CMakeOutput.log".
CMake Error: Unable to open check cache file for write. /home/z3lt/Code/Cpp/thread/CMakeFiles/cmake.check_cache
[z3lt-lu@Arch thread]$

this last error can be "fixed" by using sudo, its after effect of doing 'cmake ./' as root(i think)
anyways not a problem


g++ -o app -std=c++17 -pthread main.cpp
Works just fine.
now that i look at CMakeOutput.log it seems like i should use -std=c++1z flag instead of -std=c++17
anyways... 

cmake_minimum_required (VERSION 3.0)
project (Threads)
set( CMAKE_C_FLAGS "-Wall -g -std=c++17 -pthread" )
set( CMAKE_EXPORT_COMPILE_COMMANDS ON )
set(THREADS_PREFER_PTHREADS_FLAG ON)
set(CMAKE_THREAD_PREFER_PTHREADS TRUE)
find_package( Threads REQUIRED )
add_executable( thread main.cpp )
#target_link_libraries( thread ${CMAKE_THREAD_LIBS_INIT} )
target_link_libraries( thread Threads::Threads )

I tried quite a few solutions i found online but none of it works (thats why my CMakeLists.txt looks like that) but none of it works.
Any ideas?

Last edited by z3lt (2018-07-19 05:54:22)

Re: [SOLVED] CMake add_package problem

Welcome to the arch linux forums z3lt.  Works for me.  Please use code tags not quote tags for commands and their outputs. 

$ cat CMakeLists.txt 
cmake_minimum_required (VERSION 3.0)
project (Threads)
set( CMAKE_C_FLAGS "-Wall -g -std=c++17 -pthread" )
set( CMAKE_EXPORT_COMPILE_COMMANDS ON )
set(THREADS_PREFER_PTHREADS_FLAG ON)
set(CMAKE_THREAD_PREFER_PTHREADS TRUE)
find_package( Threads REQUIRED )
add_executable( thread main.cpp )
#target_link_libraries( thread ${CMAKE_THREAD_LIBS_INIT} )
target_link_libraries( thread Threads::Threads )
$ touch main.cpp
$ cmake ./
-- The C compiler identification is GNU 8.1.1
-- The CXX compiler identification is GNU 8.1.1
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Looking for pthread.h
-- Looking for pthread.h - found
-- Looking for pthread_create
-- Looking for pthread_create - found
-- Found Threads: TRUE  
-- Configuring done
-- Generating done
-- Build files have been written to: /tmp/testcmake

Re: [SOLVED] CMake add_package problem

Other modules like OpenAL or SDL work just fine. 

cmake_minimum_required (VERSION 3.0)
project (Threads)
find_package( OpenAL REQUIRED )
find_package( SDL REQUIRED )
find_package( Threads REQUIRED )
add_executable( thread main.cpp )

produces same error 

[z3lt-lu@Arch thread]$ cmake ./
-- Could NOT find Threads (missing: Threads_FOUND) 
CMake Error at /usr/share/cmake-3.11/Modules/FindPackageHandleStandardArgs.cmake:137 (message):
  Could NOT find Threads (missing: Threads_FOUND)
Call Stack (most recent call first):
  /usr/share/cmake-3.11/Modules/FindPackageHandleStandardArgs.cmake:378 (_FPHSA_FAILURE_MESSAGE)
  /usr/share/cmake-3.11/Modules/FindThreads.cmake:205 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
  CMakeLists.txt:6 (find_package)
-- Configuring incomplete, errors occurred!
See also "/home/z3lt/Code/Cpp/thread/CMakeFiles/CMakeOutput.log".

btw ty for the welcome

Re: [SOLVED] CMake add_package problem

Here it is CMakeOutput.log. 

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Compiling the C compiler identification source file "CMakeCCompilerId.c" succeeded.
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The C compiler identification is GNU, found in "/home/z3lt/Code/Cpp/thread/CMakeFiles/3.11.4/CompilerIdC/a.out"
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" succeeded.
Compiler: /usr/bin/c++ 
Build flags: 
Id flags:  
The output was:
Compilation of the CXX compiler identification source "CMakeCXXCompilerId.cpp" produced "a.out"
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make[1]: Entering directory '/home/z3lt/Code/Cpp/thread/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_b7c24.dir/feature_tests.cxx.o
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Linking CXX executable cmTC_b7c24
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Detecting CXX [-std=c++98] compiler features compiled with the following output:
Change Dir: /home/z3lt/Code/Cpp/thread/CMakeFiles/CMakeTmp
Run Build Command:"/usr/bin/make" "cmTC_d506f/fast"
/usr/bin/make -f CMakeFiles/cmTC_d506f.dir/build.make CMakeFiles/cmTC_d506f.dir/build
make[1]: Entering directory '/home/z3lt/Code/Cpp/thread/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_d506f.dir/feature_tests.cxx.o
/usr/bin/c++    -std=c++98 -o CMakeFiles/cmTC_d506f.dir/feature_tests.cxx.o -c /home/z3lt/Code/Cpp/thread/CMakeFiles/feature_tests.cxx
Linking CXX executable cmTC_d506f
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/usr/bin/c++       -rdynamic CMakeFiles/cmTC_d506f.dir/feature_tests.cxx.o  -o cmTC_d506f 
make[1]: Leaving directory '/home/z3lt/Code/Cpp/thread/CMakeFiles/CMakeTmp'
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Actually its for a different CMakeLists.txt but error is still the same.

Last edited by z3lt (2018-07-18 20:19:44)

Re: [SOLVED] CMake add_package problem

Difference seems to be this is present at the end of my system's CMakeOutput.log 

Determining if the include file pthread.h exists passed with the following output:
Change Dir: /tmp/testcmake/CMakeFiles/CMakeTmp
Run Build Command:"/usr/bin/make" "cmTC_c1996/fast"
/usr/bin/make -f CMakeFiles/cmTC_c1996.dir/build.make CMakeFiles/cmTC_c1996.dir/build
make[1]: Entering directory '/tmp/testcmake/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_c1996.dir/CheckIncludeFile.c.o
/usr/bin/cc   -Wall -g -std=c++17 -pthread    -o CMakeFiles/cmTC_c1996.dir/CheckIncludeFile.c.o   -c /tmp/testcmake/CMakeFiles/CMakeTmp/CheckIncludeFile.c
cc1: warning: command line option ‘-std=c++17’ is valid for C++/ObjC++ but not for C
Linking C executable cmTC_c1996
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_c1996.dir/link.txt --verbose=1
/usr/bin/cc -Wall -g -std=c++17 -pthread     -rdynamic CMakeFiles/cmTC_c1996.dir/CheckIncludeFile.c.o  -o cmTC_c1996 
make[1]: Leaving directory '/tmp/testcmake/CMakeFiles/CMakeTmp'
Determining if the pthread_create exist passed with the following output:
Change Dir: /tmp/testcmake/CMakeFiles/CMakeTmp
Run Build Command:"/usr/bin/make" "cmTC_8b7d4/fast"
/usr/bin/make -f CMakeFiles/cmTC_8b7d4.dir/build.make CMakeFiles/cmTC_8b7d4.dir/build
make[1]: Entering directory '/tmp/testcmake/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_8b7d4.dir/CheckSymbolExists.c.o
/usr/bin/cc   -Wall -g -std=c++17 -pthread    -o CMakeFiles/cmTC_8b7d4.dir/CheckSymbolExists.c.o   -c /tmp/testcmake/CMakeFiles/CMakeTmp/CheckSymbolExists.c
cc1: warning: command line option ‘-std=c++17’ is valid for C++/ObjC++ but not for C
Linking C executable cmTC_8b7d4
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_8b7d4.dir/link.txt --verbose=1
/usr/bin/cc -Wall -g -std=c++17 -pthread     -rdynamic CMakeFiles/cmTC_8b7d4.dir/CheckSymbolExists.c.o  -o cmTC_8b7d4 
make[1]: Leaving directory '/tmp/testcmake/CMakeFiles/CMakeTmp'
File /tmp/testcmake/CMakeFiles/CMakeTmp/CheckSymbolExists.c:
/* */
#include <pthread.h>
int main(int argc, char** argv)
  (void)argv;
#ifndef pthread_create
  return ((int*)(&pthread_create))[argc];
#else
  (void)argc;
  return 0;
#endif
					
Re: [SOLVED] CMake add_package problem

						
After moving to new dir (not changing CMakeLists.txt) i got same CmakeOutput.log like you. (meaning no cmake errors)
Now make doesn't seem to work, but i guess I'll figure something out. 
[z3lt-lu@Arch threads]$ make
[ 50%] Linking CXX executable thread
CMakeFiles/thread.dir/main.cpp.o: In function `std::thread::thread<void (&)()>(void (&)())':
main.cpp:(.text._ZNSt6threadC2IRFvvEJEEEOT_DpOT0_[_ZNSt6threadC5IRFvvEJEEEOT_DpOT0_]+0x2f): undefined reference to `pthread_create'
collect2: error: ld returned 1 exit status
make[2]: *** [CMakeFiles/thread.dir/build.make:84: thread] Error 1
make[1]: *** [CMakeFiles/Makefile2:68: CMakeFiles/thread.dir/all] Error 2
make: *** [Makefile:84: all] Error 2
and here is simple code, maybe i did something wrong.
#include <iostream>
#include <thread>
#include <string>
using namespace std;
void function_1()
    for(int i = 0; i < 10; i++)
        cout<<"f1:"<<i<<endl;
int main(int argc, char* args[])
    thread t1(function_1);
    function_1();
    t1.join();
    return 0;
}
Then again 'CMake add_package problem' could be considered solved.

					
Re: [SOLVED] CMake add_package problem

						
set(THREADS_PREFER_PTHREADS_FLAG ON) should be set(THREADS_PREFER_PTHREAD_FLAG TRUE) and
set(CMAKE_THREAD_PREFER_PTHREADS TRUE) should be set(THREADS_PREFER_PTHREAD_FLAG TRUE)
cmake_minimum_required (VERSION 3.1)
project (pname)
#set( CMAKE_C_FLAGS "-Wall -g -std=c++17 -pthread" )
#set( CMAKE_EXPORT_COMPILE_COMMANDS ON )
set(CMAKE_THREAD_PREFER_PTHREAD ON)
set(THREADS_PREFER_PTHREAD_FLAG TRUE)
find_package( Threads REQUIRED )
add_executable( test main.cpp )
#target_link_libraries( thread ${CMAKE_THREAD_LIBS_INIT} )
target_link_libraries( test Threads::Threads )

					
Re: [SOLVED] CMake add_package problem

						
Finally got it to work. (both cmake and make)
Moved CMakeLists.txt and main.cpp to fresh dir.
CMakeLists.txt
cmake_minimum_required (VERSION 3.0)
project (Treads)
set( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -std=c++1z -pthread" )
set( CMAKE_EXPORT_COMPILE_COMMANDS ON )
set(THREADS_PREFER_PTHREAD_FLAG TRUE)
#set(CMAKE_THREAD_PREFER_PTHREAD ON)
find_package( Threads REQUIRED )
MESSAGE( STATUS "variable is: " ${CMAKE_THREAD_LIBS_INIT} ${CMAKE_CXX_FLAGS})
add_executable( thread main.cpp )
target_link_libraries( thread ${CMAKE_THREAD_LIBS_INIT} )
Project name used to be 'Threads' which could have been a problem.
CMAKE_C_FLAGS instead of CMAKE_CXX_FLAGS could have been a problem as well.
I am glad it wrks, thanks for help.
don't mind the message thing xd

						
Last edited by z3lt (2018-07-19 05:54:10)
 
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