# GCC

[中文]

## Common Porting Problems and Fixes

### `sys/dirent.h` No Longer Includes Function Prototypes

#### Issue

Compilation errors may occur in code that previously worked with the old toolchain. For example:

    #include <sys/dirent.h>
    /* .... */
    DIR* dir = opendir("test_dir");
    /* .... */
    /**
     * Compile error:
     * test.c: In function 'test_opendir':
     * test.c:100:16: error: implicit declaration of function 'opendir' [-Werror=implicit-function-declaration]
     *   100 |     DIR* dir = opendir(path);
     *       |                ^~~~~~~
     */

#### Solution

To resolve this issue, the correct header must be included. Refactor the code like this:

    #include <dirent.h>
    /* .... */
    DIR* dir = opendir("test_dir");

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