Hi Sandy,

[auto build test ERROR on: char-misc/char-misc-testing]
[also build test ERROR on: v4.3 next-20151106]

url:    https://github.com/0day-ci/linux/commits/Sandy-Harris/A-couple-of-generated-files/20151107-223540
config: sh-allyesconfig (attached as .config)
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=sh 

All errors (new ones prefixed by >>):

>> scripts/gen_random.c:61:19: fatal error: stdio.h: No such file or directory
   compilation terminated.
   make[2]: *** [scripts/gen_random] Error 1
   <stdin>:1229:2: warning: #warning syscall sched_setattr not implemented [-Wcpp]
   <stdin>:1232:2: warning: #warning syscall sched_getattr not implemented [-Wcpp]
   <stdin>:1235:2: warning: #warning syscall renameat2 not implemented [-Wcpp]
   <stdin>:1238:2: warning: #warning syscall seccomp not implemented [-Wcpp]
   <stdin>:1241:2: warning: #warning syscall getrandom not implemented [-Wcpp]
   <stdin>:1244:2: warning: #warning syscall memfd_create not implemented [-Wcpp]
   <stdin>:1247:2: warning: #warning syscall bpf not implemented [-Wcpp]
   <stdin>:1250:2: warning: #warning syscall execveat not implemented [-Wcpp]
   <stdin>:1298:2: warning: #warning syscall userfaultfd not implemented [-Wcpp]
   <stdin>:1301:2: warning: #warning syscall membarrier not implemented [-Wcpp]
   make[2]: Target '__build' not remade because of errors.
   make[1]: *** [prepare0] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [sub-make] Error 2

vim +61 scripts/gen_random.c

06038f35 Sandy Harris 2015-11-07  45   * This is certainly done early enough and the data is random
06038f35 Sandy Harris 2015-11-07  46   * enough, but it is not necessarily secret enough.
06038f35 Sandy Harris 2015-11-07  47   *
06038f35 Sandy Harris 2015-11-07  48   * In some cases -- for example, a firewall machine that compiles
06038f35 Sandy Harris 2015-11-07  49   * its own kernel -- this alone might be enough to ensure secure
06038f35 Sandy Harris 2015-11-07  50   * initialisation, since only an enemy who already has root could
06038f35 Sandy Harris 2015-11-07  51   * discover this data. Of course even in those cases it should not
06038f35 Sandy Harris 2015-11-07  52   * be used alone, only as one layer of a defense in depth.
06038f35 Sandy Harris 2015-11-07  53   *
06038f35 Sandy Harris 2015-11-07  54   * In other cases -- a kernel that is compiled once then used in
06038f35 Sandy Harris 2015-11-07  55   * a Linux distro or installed on many devices -- this is likely
06038f35 Sandy Harris 2015-11-07  56   * of very little value. It complicates an attack somewhat, but
06038f35 Sandy Harris 2015-11-07  57   * it clearly will not stop a serious attacker and may not even
06038f35 Sandy Harris 2015-11-07  58   * slow them down much.
06038f35 Sandy Harris 2015-11-07  59   */
06038f35 Sandy Harris 2015-11-07  60  
06038f35 Sandy Harris 2015-11-07 @61  #include <stdio.h>
06038f35 Sandy Harris 2015-11-07  62  #include <stdlib.h>
06038f35 Sandy Harris 2015-11-07  63  #include <unistd.h>
06038f35 Sandy Harris 2015-11-07  64  #include <fcntl.h>
06038f35 Sandy Harris 2015-11-07  65  #include <stdint.h>
06038f35 Sandy Harris 2015-11-07  66  #include <ctype.h>
06038f35 Sandy Harris 2015-11-07  67  
06038f35 Sandy Harris 2015-11-07  68  /*
06038f35 Sandy Harris 2015-11-07  69   * Configuration information

:::::: The code at line 61 was first introduced by commit
:::::: 06038f35641185897feb14917d89d03fab1710ba Produces generated/random_init.h for random driver

:::::: TO: Sandy Harris <sandyinchina@gmail.com>
:::::: CC: 0day robot <fengguang.wu@intel.com>

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