elfutils: fix building elfutils-native with GCC7

This is heavily based on the oe-core master commit with the same
subject, but includes a backport of upstream's fix for the fallthrough
warnings rebased to 0.166 (the oe-core patch which targeted 0.168 did
not apply), a rebase of the format-truncation patch, and a backport of
the upstream format-length patch.

Info from OE-Core master patch follows:

	From OE-Core rev: aaf4c4f3d09ac3897205417eb15e19d54e0c0d05
	From: Joshua Lock <joshua.g.lock@intel.com>

	Backport a fix from upstream for a -Wformat-truncation=2 warning
	and implement a simple fix for a -Wimplicit-fallthrough warning.

	Signed-off-by: Joshua Lock <joshua.g.lock@intel.com>
	Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

(From OE-Core rev: 3b91be97ae8c36cd6bad86fed992efc9800f4c9e)

Signed-off-by: Cody P Schafer <dev@codyps.com>
Signed-off-by: Armin Kuster <akuster808@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 36 insertions, 0 deletions

diff --git a/meta/recipes-devtools/elfutils/elfutils-0.166/fallthrough.patch b/meta/recipes-devtools/elfutils/elfutils-0.166/fallthrough.patch
new file mode 100644
index 0000000000..b2623f9d2e
--- /dev/null
+++ b/meta/recipes-devtools/elfutils/elfutils-0.166/fallthrough.patch
@@ -0,0 +1,36 @@
+GCC7 adds -Wimplicit-fallthrough to warn when a switch case falls through,
+however this causes warnings (which are promoted to errors) with the elfutils
+patches from Debian for mips and parisc, which use fallthrough's by design.
+
+Explicitly mark the intentional fallthrough switch cases with a comment to
+disable the warnings where the fallthrough behaviour is desired.
+
+Upstream-Status: Pending [debian]
+Signed-off-by: Joshua Lock <joshua.g.lock@intel.com>
+
+Index: elfutils-0.168/backends/parisc_retval.c
+===================================================================
+--- elfutils-0.168.orig/backends/parisc_retval.c
++++ elfutils-0.168/backends/parisc_retval.c
+@@ -166,7 +166,7 @@ parisc_return_value_location_ (Dwarf_Die
+          return nloc_intregpair;
+ 
+        /* Else fall through.  */
+-      }
++      } // fallthrough
+ 
+     case DW_TAG_structure_type:
+     case DW_TAG_class_type:
+Index: elfutils-0.168/backends/mips_retval.c
+===================================================================
+--- elfutils-0.168.orig/backends/mips_retval.c
++++ elfutils-0.168/backends/mips_retval.c
+@@ -387,7 +387,7 @@ mips_return_value_location (Dwarf_Die *f
+               else
+                 return nloc_intregpair;
+             }
+-        }
++        } // fallthrough
+ 
+       /* Fallthrough to handle large types */
+