編譯錯誤使用riscv64未知-ELF-GCC

Question

/* Includes */ 
#include <unistd.h>  /* Symbolic Constants */ 
#include <sys/types.h> /* Primitive System Data Types */ 
#include <errno.h>  /* Errors */ 
#include <stdio.h>  /* Input/Output */ 
#include <stdlib.h>  /* General Utilities */ 
#include <pthread.h> /* POSIX Threads */ 
#include <string.h>  /* String handling */ 

/* prototype for thread routine */ 
void print_message_function (void *ptr); 

/* struct to hold data to be passed to a thread 
    this shows how multiple data items can be passed to a thread */ 
typedef struct str_thdata 
{ 
    int thread_no; 
    char message[100]; 
} thdata; 

int main() 
{ 
    pthread_t thread1, thread2; /* thread variables */ 
    thdata data1, data2;   /* structs to be passed to threads */ 

    /* initialize data to pass to thread 1 */ 
    data1.thread_no = 1; 
    strcpy(data1.message, "Hello!"); 

    /* initialize data to pass to thread 2 */ 
    data2.thread_no = 2; 
    strcpy(data2.message, "Hi!"); 

    /* create threads 1 and 2 */  
    pthread_create (&thread1, NULL, (void *) &print_message_function, (void *) &data1); 
    pthread_create (&thread2, NULL, (void *) &print_message_function, (void *) &data2); 

    /* Main block now waits for both threads to terminate, before it exits 
     If main block exits, both threads exit, even if the threads have not 
     finished their work */ 
    pthread_join(thread1, NULL); 
    pthread_join(thread2, NULL); 

    /* exit */ 
    exit(0); 
} /* main() */ 

/** 
* print_message_function is used as the start routine for the threads used 
* it accepts a void pointer 
**/ 
void print_message_function (void *ptr) 
{ 
    thdata *data;    
    data = (thdata *) ptr; /* type cast to a pointer to thdata */ 

    /* do the work */ 
    printf("Thread %d says %s \n", data->thread_no, data->message); 

    pthread_exit(0); /* exit */ 
} /* print_message_function (void *ptr) */ 

，我面臨是 線程ex.c錯誤編譯多線程程序：24：5：錯誤：未知類型名稱 '的pthread_t' 的pthread_t線程1，線程2;/*線程變量*/ ^ 線程ex.c：36：5：警告：函數 '在pthread_create'[-Wimplicit函數聲明] 在pthread_create（&線程1，NULL，（無效*）& print_message_function的隱式聲明，（void ）& data1）; ^ thread-ex.c：42：5：warning：隱式聲明函數'pthread_join'[-Wimplicit-function-declaration] pthread_join（thread1，NULL）; ^ thread-ex.c：函數'print_message_function'： thread-ex.c：61：5：warning：隱式聲明函數'pthread_exit'[-Wimplicit-function-declaration] pthread_exit（0）;/退出*/

Answer 1

pthread不適用於基於newlib的RISC-V編譯器。您將需要使用基於Linux的RISC-V編譯器（riscv64-unknown-linux-gnu-gcc）。您可以在同一個riscv-gcc repo（https://github.com/riscv/riscv-gnu-toolchain）上找到有關構建和安裝基於Linux的編譯器的說明。