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AIX CMakeTest does not add correct -lpthread


AIX CMakeTest does not add correct -lpthread

By : Lukas Macko
Date : November 20 2020, 09:01 AM
Hope this helps You have to use target_link_libraries and apply it on your executable. Simple example on a project using boost::threads :
code :
include_directories(
  ${CMAKE_SOURCE_DIR}/src
)
include_directories( SYSTEM
  ${Boost_INCLUDE_DIRS}
)
link_directories(
  ${Boost_LIBRARY_DIRS}
)
add_executable( MyProgram
  ${CMAKE_SOURCE_DIR}/src/main.cpp
  ${CMAKE_SOURCE_DIR}/src/my_program.cpp
)
target_link_libraries( MyProgram
  ${Boost_LIBRARIES}
  pthread
)


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gcc -lpthread not working

gcc -lpthread not working


By : user3811410
Date : March 29 2020, 07:55 AM
this will help I have ubuntu 11 installed in my system. I have a c program that uses the pthread library. I get the error Undefined reference to sem_wait() even if I have compiled with the flag -lpthread. , Try:
code :
gcc -pthread
-lpthread option of gcc

-lpthread option of gcc


By : Felipe Andrés Velásq
Date : March 29 2020, 07:55 AM
Hope this helps Well linking and compilation are two separate phases.
You include the header pthread.h so that the compiler understands the data types & symbol names, which you use in your source files but are defined/declared in the pthread library header file.
Why do you need '-lpthread'?

Why do you need '-lpthread'?


By : shahid
Date : March 29 2020, 07:55 AM
hope this fix your issue pthread.h is not a library it is just a header file which gives you declaration (not the actual body of function) of functions which you will be using for multi-threading.
using -libpthread or -lpthread while compiling actually links the GCC library pthread with your code. Hence the compiler flag, -libLIBRARY_NAME or -lLIBRARY_NAME is essential.
code :
undefined reference to `pthread_create'

undefined reference to `pthread_join'
cannot find -lpthread

cannot find -lpthread


By : Tyler
Date : March 29 2020, 07:55 AM
To fix the issue you can do had this same problem w/mingw. got libpthreadGC2.a from ftp://sourceware.org/pub/pthreads-win32/dll-latest/lib/x86/, put it in C;\mingw\lib and renamed it to libpthread.a. i didn't know gcc's -l switch means "apprend 'lib' to the front and '.a' to the back" e.g. -lpthread = libpthread.a
multithreading in C using -lpthread

multithreading in C using -lpthread


By : Ahmed Sayed
Date : March 29 2020, 07:55 AM
like below fixes the issue You call pthread_create and then immediately pthread_join.
The problem with that is that pthread_join will wait for the thread to exit, making your code serial instead of parallel.
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