Codeblocks pthread7/1/2023 – Add Pthread to Linker Libraries in Your Integrated Development Environment This means that when you are using the pthread.h header file in your C code, you must use the -pthread flag when you compile your code. The reason why the previous command throws an error is because we’ve omitted the -pthread flag. However, the following will throw an error: Gcc -pthread -o test-pthread test-pthread.c That’s because we’ve given the compiler the parameters for a successful compile process. Failure to do so will lead to a reference error about pthread.įor example, if the name of your sample code is test-pthread.c and it has a pthread.h file within it, the next command will compile test-pthread.c without throwing errors. In the situation where you have pthread.h as a header file in your C code, you must use a pthread flag when compiling the code. The wrong compiler will lead to an error during source code compilation while the right one will produce no issues. However, you’ll get an error if you take out the pthread.h file then make an attempt to compile the code. Without it, you’ll get an error when you try to compile your C code.įor example, if you have a C code with pthread.h at the top of the code, you should not get any errors regarding a missing pthread_create during compilation with the right flag. The easiest solution when dealing with pthread reference errors is to make sure that you’ve added the pthread.h file at the top of your code. – Include the Pthread Header File in Your C Code We’ll be going into more detail about this, so continue reading. You can fix the reference to pthread error by ensuring you include the pthread header file in your C code, using the right compiler flag, or adding pthread to linker libraries in your Integrated Development Environment. However, if you are using CMake, the following are the common errors you’ll encounter if pthread is missing:Ĭhecksymbolexists c 8 undefined reference to pthread_createĬhecksymbolexists c text 0x16: undefined reference to pthread_create How To Fix the Undefined Reference to Pthread Error For example, you’ll get an undefined reference to `pthread_create’ CLion error if you are using CLion. When your IDE wants to compile a program that uses threads and you have not included pthread as part of its linker libraries, you’ll get an error. – Pthread Is Missing From Your Integrated Development Environment The question is: What makes the command wrong? You’ll find out in the how-to-fix section of this guide below. You’ll get a reference error about pthread_create. For example, if you have a valid C program called test-file.c and you try to use the following command to compile it on Linux: – You Are Using the Wrong Compiler FlagĪ valid program with the wrong compilation command can lead to an undefined reference to pthread_create’ Windows error. This error arises due to a file link error when using threads.h, a companion of pthread.h. When you are compiling a C program with GCC on Linux via the command line, you can run into an error like undefined reference to thrd_create. – You Are Compiling a C Program With GCC on Linux That is because pthread_create is part of the functions in pthread.h. Therefore, if you don’t have the pthread.h file and you try to use a thread function like pthread_create in C, you’ll get a reference error. The pthread.h header file provides these capabilities via a suite of functions. On such a system, you can implement threads on a kernel-level to improve execution speed. Meanwhile, to get the most out of pthread, it is best to use it on a system with multiple processors or cores. Pthread allows you to create threads for concurrent purposes. Let’s take a closer look at these reasons to see which one applies to you. You are getting the reference error to pthread_create due to several reasons such as the pthread header file is missing, you are compiling a C program with GCC on Linux, and you are using the wrong compiler flag, or pthread is missing from your Integrated Development Environment. Why Are You Getting the Reference Error to Pthread_create? – What Is the Difference Between Lpthread and Pthread?.– What Is the Use of the Pthread_join() Function?.– Where Is the Pthread Library in Linux?.– What Are Pthreads in Operating System?.Useful Information About the Pthread Reference Error.– Add Pthread to Linker Libraries in Your Integrated Development Environment.– Include the Pthread Header File in Your C Code.How To Fix the Undefined Reference to Pthread Error.– Pthread Is Missing From Your Integrated Development Environment.
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