On 02/25/2015 10:42 AM, Emre Can Kucukoglu wrote:
> Hello,
>
> I want to use SELinux for my experimental vanilla kernel distribution in
> Pandaboard ES. To achieve that I have configured my kernel for SELinux
> support. Then, I have recently cloned selinux userspace repository to
> cross-compile it for arm architecture. I use arm-linux-gnueabi toolchain
> in Ubuntu 14.04 workstation.
>
> $ export ARCH=arm
> $ export CROSS_COMPILE=arm-linux-gnueabi-
>
> As mentioned in readme instruction,
>
> $ make DESTDIR=~/obj install install-pywrap
>
> command is used, however due to -Werror flags in various Makefile's,
> error is thrown:
>
> dispol.c: In function ‘main’:
> dispol.c:452:8: error: ignoring return value of ‘fgets’, declared with
> attribute warn_unused_result [-Werror=unused-result]
> fgets(ans, sizeof(ans), stdin);
> ^
> dispol.c:479:9: error: ignoring return value of ‘fgets’, declared with
> attribute warn_unused_result [-Werror=unused-result]
> fgets(ans, sizeof(ans), stdin);
> ^
> dispol.c:490:9: error: ignoring return value of ‘fgets’, declared with
> attribute warn_unused_result [-Werror=unused-result]
> fgets(ans, sizeof(ans), stdin);
> ^
> dispol.c:517:9: error: ignoring return value of ‘fgets’, declared with
> attribute warn_unused_result [-Werror=unused-result]
> fgets(OutfileName, sizeof(OutfileName), stdin);
> ^
> cc1: all warnings being treated as errors
> make[2]: *** [dispol.o] Error 1
>
> I did this modification to get over this error which is caused by
> -Werror flag:
>
> char *fgetsret; /* error is given, because return value is not captured */
> fgetsret = fgets(...);
> if (!fgetsret) { /* if fgetsret is not used, another error comes from
> warning */
> // some exit message
> exit(1);
> }
>
> Did I miss something about SELinux cross-compilation for an arm
> architecture, since constantly I'm taking errors.
Hmm...that's interesting. Builds just fine on Fedora 20. I do however
get the same error building on Ubuntu 14.04 (which is not something we
typically test on; most SELinux developers work on Fedora).
Willing to accept patches to fix it, but it is merely a test/debugging
program that you can even exclude from your build if you like.
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