gcc version conflict

Hi all,
I'm trying to compile the kernel module for some NVidia drivers. I'm
getting an error message saying that I'm compiling a module with a different version of the compiler than the one used to compile the kernel (gcc 2.95.4 is what's installed; the kernel version is 2.2.20 and at one point I was able to check the compiler version that compiled it but I can't remember how I did it). What's the best way to work around this problem?

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[whit@giftie whit]$ cat /proc/version
Linux version 2.4.13 (whit@giftie) (gcc version 2.95.3 20010315 (release)) #1 Tu e Oct 30 22:04:20 EST 2001
[whit@giftie whit]$ tty
/dev/vc/5
[whit@giftie whit]$ cat /usr/local/bin/trail
#!/bin/sh
/bin/sed 's/ *$//g' $@
[whit@giftie whit]$ cat /dev/vcs5|fold|trail>oops

I have devfs and devfsd, so I can use either /dev/vcc/<n> or /dev/vcs<n> but the tty command reports the real (devfs) device name. Please don't be confused if tty reports /dev/vcs<n>

I guess the easiest way to work around it would be to recompile the kernel and modules with the gcc you have installed.

Lawson
--
---oops---
There are many ways. Some day we will write all the ways in a big book. We will then burn the big book. - M. K. Tulley

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This is a FAQ and is in the README you received with the driver/source. Here is an excrpt;

Q: Compiling the NVdriver kernel module gives this error:

You appear to be compiling the NVdriver kernel module with a compiler different from the one that was used to compile the running kernel. This may be perfectly fine, but there are cases where this can lead to unexpected behaviour and system crashes.

If you know what you are doing and want to override this check, you can do so by setting IGNORE_CC_MISMATCH.

In any other case, set the CC environment variable to the name of the compiler that was used to compile the kernel.

A: You should compile the NVdriver kernel module with the same compiler
version that was used to compile your kernel. Some Linux kernel data structures are dependent on the version of gcc used to compile it; for example, in include/linux/spinlock.h:

        ...
        * Most gcc versions have a nasty bug with empty initializers.
        */
        #if (__GNUC__ > 2)
          typedef struct { } rwlock_t;
          #define RW_LOCK_UNLOCKED (rwlock_t) { }
        #else
          typedef struct { int gcc_is_buggy; } rwlock_t;
          #define RW_LOCK_UNLOCKED (rwlock_t) { 0 }
        #endif

If the kernel is compiled with gcc 2.x, but gcc 3.x is used when the open files in NVdriver are built (or vice versa), the size of rwlock_t will vary, and things like ioremap will fail.

To check what version of gcc was used to compile your kernel, you can examine the output of:

cat /proc/version

To check what version of gcc is currently in your $PATH, you can examine the output of:

gcc -v

Regards Richard
[email protected]
http://people.zeelandnet.nl/pa3gcu/

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