[Buildroot] [PATCH] netplug: add two patches to fix musl build issues

[Yann E. MORIN]

Thomas, All,

On 2016-08-05 22:52 +0200, Thomas Petazzoni spake thusly:
> This commit adds two patches to netplug that are needed for this package
> to build with musl:
> 
>  - One patch to add a missing header inclusion
>  - One patch to fix a conflicting prototype on __assert_fail().
> 
> Fixes:
> 
>   http://autobuild.buildroot.net/results/c2a5dfedba46cc8eb3d0c5c43f1f76fe0bb1805f/
> 
> Signed-off-by: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>

Reviewed-by:  "Yann E. MORIN" <yann.morin.1998 at free.fr>

Regards,
Yann E. MORIN.

> ---
>  .../netplug/0002-add-missing-time-include.patch    | 20 +++++++++
>  package/netplug/0003-remove-assert-fail.patch      | 51 ++++++++++++++++++++++
>  2 files changed, 71 insertions(+)
>  create mode 100644 package/netplug/0002-add-missing-time-include.patch
>  create mode 100644 package/netplug/0003-remove-assert-fail.patch
> 
> diff --git a/package/netplug/0002-add-missing-time-include.patch b/package/netplug/0002-add-missing-time-include.patch
> new file mode 100644
> index 0000000..f204c92
> --- /dev/null
> +++ b/package/netplug/0002-add-missing-time-include.patch
> @@ -0,0 +1,20 @@
> +Add missing <time.h> include
> +
> +netplug.h uses time_t, so it must include <time.h>. This fixes a build
> +issue with the musl C library.
> +
> +Signed-off-by: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>
> +
> +Index: b/netplug.h
> +===================================================================
> +--- a/netplug.h
> ++++ b/netplug.h
> +@@ -20,7 +20,7 @@
> + #ifndef __netplug_h
> + #define __netplug_h
> + 
> +-
> ++#include <time.h>
> + #include <asm/types.h>
> + #include <sys/socket.h>
> + #include <linux/netlink.h>
> diff --git a/package/netplug/0003-remove-assert-fail.patch b/package/netplug/0003-remove-assert-fail.patch
> new file mode 100644
> index 0000000..635c462
> --- /dev/null
> +++ b/package/netplug/0003-remove-assert-fail.patch
> @@ -0,0 +1,51 @@
> +Remove __assert_fail()
> +
> +The netplug code uses the assert() macro in various places. In glibc
> +internally, assert() uses a function called __assert_fail() to print a
> +message and abort. Relying on internal glibc details, netplug
> +re-defines __assert_fail() in the hope that it will get called instead
> +of glibc internal version.
> +
> +This attempt:
> +
> + * Doesn't work with uClibc, which doesn't use any __assert_fail()
> +   function at all. It doesn't fail to build, but it is entirely
> +   useless.
> +
> + * Fails to build with musl, which also defines __assert_fail(), but
> +   with a different prototype.
> +
> +We simply remove the __assert_fail() implementation, so that the C
> +library implementation of assert() just does its normal work. The only
> +functionality lost is that the message is displayed on the standard
> +output rather than in netplug's logs (and this was only working with
> +glibc anyway).
> +
> +Signed-off-by: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>
> +
> +Index: b/lib.c
> +===================================================================
> +--- a/lib.c
> ++++ b/lib.c
> +@@ -199,21 +199,6 @@
> +     return x;
> + }
> + 
> +-
> +-void
> +-__assert_fail(const char *assertion, const char *file,
> +-              unsigned int line, const char *function)
> +-{
> +-    do_log(LOG_CRIT, "%s:%u: %s%sAssertion `%s' failed",
> +-           file, line,
> +-           function ? function : "",
> +-           function ? ": " : "",
> +-           assertion);
> +-
> +-    abort();
> +-}
> +-
> +-
> + /*
> +  * Local variables:
> +  * c-file-style: "stroustrup"
> -- 
> 2.7.4
> 
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