topic Re: error: initialization from incompatible pointer type [-Werror=incompatible-pointer-types] in i.MX Processors

error: initialization from incompatible pointer type [-Werror=incompatible-pointer-types]

santhosh2 — Thu, 22 Aug 2019 03:56:29 GMT

Hi,

I am getting this error, I dont know for what reason i am getting this error, works for when compiled for PC

doesnt work when compiled for i.mx8mmini

------------------------------------------Error------------------------------------------------------

error: initialization from incompatible pointer type [-Werror=incompatible-pointer-types]
   .write=device_write,
          ^~~~~~~~~~~~
/home/santhosh/Desktop/IP_Camera/App_development/Driver/imx8mmini_gpio_platformdevice.c:280:10: note: (near initialization for 'Fops.write')
/home/santhosh/Desktop/IP_Camera/App_development/Driver/imx8mmini_gpio_platformdevice.c:283:19: error: initialization from incompatible pointer type [-Werror=incompatible-pointer-types]
   .unlocked_ioctl=gpio_ioctl

--------------------------------------------------------------------------------------------------------------

The code is for quick reference

-------------------------------------start-code--------------------------------------------------------

struct file_operations Fops =
{
   .owner           =   THIS_MODULE,
   .read           =   device_read,
   .write           =   device_write,
   .open           =   device_open,
   .release       =   device_release,
   .unlocked_ioctl   =   gpio_ioctl
};

static int device_open(struct inode *inode, struct file *file)
{
return 0;
}
static int device_release(struct inode *inode, struct file *file)
{
return 0;
}
static ssize_t device_read(struct file *file, char __user *buffer, size_t length, loff_t * offset)
{
return 0;
}
//static ssize_t device_write(struct file *file, const char __user *user_buf, size_t count, loff_t *ppos)
static ssize_t device_write(struct file *file, char __user *buffer, size_t length, loff_t * offset)
{
return 0;
}

int gpio_ioctl(struct file *file, unsigned int ioctl_num, unsigned long ioctl_param)
{

return 0;

}

------------------------------------------------end-Code-----------------------------------------------------------

How can i resolve this issue

Regards

Santhosh

Re: error: initialization from incompatible pointer type [-Werror=incompatible-pointer-types]

turker — Thu, 22 Aug 2019 05:18:51 GMT

It seems you have -Werror compiler flag enabled. See this link link.

Re: error: initialization from incompatible pointer type [-Werror=incompatible-pointer-types]

igorpadykov — Thu, 22 Aug 2019 05:42:59 GMT

one can try to recompile from scratch image (including application) using documentation :

i.MX Software | NXP

Best regards
igor
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Re: error: initialization from incompatible pointer type [-Werror=incompatible-pointer-types]

santhosh2 — Thu, 22 Aug 2019 10:07:32 GMT

The Issue got resolved, Its the GCC revision issue

Added a library and Recompiled it worked

Reference Link:c - Why am I getting an initialization from incompatible pointer type warning? - Stack Overflow