[OpenAFS] Problem building openafs on kernel 2.6.18.2-34-default

[Russ Allbery]

Marcus Watts <mdw@umich.edu> writes:

> 2.6 uses kbuild, not cc.  The logic for this is in
> 	AC_TRY_KBUILD26
> which is defined in
> 	src/cf/linux-test1.m4
> It should save standard error, so, yes, there is *some* stuff.

> The vanilla openafs logic here doesn't explicitly save the command or
> the test fragments that failed.  That means it's not always easy to
> figure out exactly what broke.  I came up with this patch after I had a
> build break and had to figure out why.  Turns out user mode linux is
> particularly keen on weird -I logic, like relative path names, and the
> error message from the compiler just isn't sufficient.  Compare that to
> the situation where a regular compile probe fails - there you
> automatically get the failing program, the compile command that failed,
> etc -- these are standard features of the built-in configure logic and
> supplies all the information necessary to reproduce the problem
> standalone.

> Since vanilla openafs configure doesn't try doing a vanilla kernel build
> before it tests for features, it doesn't actually know if any kernel
> build can succeed.  That's why the rlim test is confusing - this isn't
> the 1st kernel test that fails.  It's the first one that fails with no
> workaround.  Talk about obscure.

> Clearly, this is a common problem.  Do we really not want to make it
> easier for people who haven't fixed this dozens of times to recognize &
> solve the problem?

I've applied your patch to head after reviewing it, and will pull it up
for 2.5 and 2.4 when I get back from lunch.

-- 
Russ Allbery (rra@stanford.edu)             <http://www.eyrie.org/~eagle/>