[uml-user] Building from source problems and possibilities

[Balaco B. <bal...@im...>]

I restarted, now I've got another kernel source (2.6.32.68), knowing
that it may be old, but it's the "newer old" for 2.6, and I hoped that
it would work.

Steps done:

1. downloaded https://cdn. kernel
.org/pub/linux/kernel/v2.6/longterm/v2.6.32/linux-2.6.32.68.tar.xz
2. extract with tar cJf (whatever)
3. A few commands:
    make defconfig ARCH=um          
    # config is saved on a file, to be restarted from a known point
    whenever needed
    make menuconfig ARCH=um
    make mrproper                    # zero start guarantee when
    repeating these steps
    make mrproper ARCH=um   #  "
    make ARCH=uml                   

4. It stops a few seconds after, with a few errors that may be simple to
fix:

===============
arch/um/os-Linux/start_up.c: In function 'check_coredump_limit':
arch/um/os-Linux/start_up.c:340:16: error: storage size of 'lim' isn't
known
  struct rlimit lim;
                ^
arch/um/os-Linux/start_up.c:341:2: error: implicit declaration of
function 'getrlimit' [-Werror=implicit-function-declaration]
  int err = getrlimit(RLIMIT_CORE, &lim);
  ^
arch/um/os-Linux/start_up.c:341:22: error: 'RLIMIT_CORE' undeclared
(first use in this function)
  int err = getrlimit(RLIMIT_CORE, &lim);
                      ^
arch/um/os-Linux/start_up.c:341:22: note: each undeclared identifier is
reported only once for each function it appears in
arch/um/os-Linux/start_up.c:349:22: error: 'RLIM_INFINITY' undeclared
(first use in this function)
  if (lim.rlim_cur == RLIM_INFINITY)
                      ^
arch/um/os-Linux/start_up.c:340:16: warning: unused variable 'lim'
[-Wunused-variable]
  struct rlimit lim;
                ^
cc1: some warnings being treated as errors
make[1]: *** [arch/um/os-Linux/start_up.o] Error 1
make: *** [arch/um/os-Linux] Error 2

===============

Do you know the reason for these two errors? And how I should fix them?


-- 
  Balaco


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