dev-ros/amcl: fix build with gcc 7.

Package-Manager: Portage-2.3.6, Repoman-2.3.2

dev-ros/amcl/amcl-1.14.0.ebuild

@@ -1,4 +1,4 @@
-# Copyright 1999-2016 Gentoo Foundation
+# Copyright 1999-2017 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=5
@@ -26,3 +26,5 @@ RDEPEND="
 DEPEND="${RDEPEND}
  test? ( dev-ros/rostest[${PYTHON_USEDEP}] )
 "
+
+PATCHES=( "${FILESDIR}/gcc7.patch" )

dev-ros/amcl/files/gcc7.patch

@@ -0,0 +1,41 @@
+commit 65261a83e7269906f726f14d7e8cc30e5f9901f0
+Author: Dmitry Rozhkov <[email protected]>
+Date: Fri Jun 16 14:50:52 2017 +0300
+
+ amcl: fix compilation with gcc v7
+
+ When building amcl with recent enough gcc v7 compilation fails with
+ the error
+
+ src/amcl/map/map_cspace.cpp: In function 'void enqueue(map_t*, unsigned int, unsigned int, unsigned int, unsigned int, std::priority_queue<CellData>&, CachedDistanceMap*, unsigned char*)':
+ src/amcl/map/map_cspace.cpp:98:34: error: call of overloaded 'abs(unsigned int)' is ambiguous
+ unsigned int di = abs(i - src_i);
+
+ Use `int abs(int)` flavour of the abs() function.
+
+diff --git a/amcl/src/amcl/map/map_cspace.cpp b/amcl/src/amcl/map/map_cspace.cpp
+index 421f718..5b4cf9c 100644
+--- a/amcl/src/amcl/map/map_cspace.cpp
++++ b/amcl/src/amcl/map/map_cspace.cpp
+@@ -86,8 +86,8 @@ get_distance_map(double scale, double max_dist)
+ return cdm;
+ }
+
+-void enqueue(map_t* map, unsigned int i, unsigned int j, 
+- unsigned int src_i, unsigned int src_j,
++void enqueue(map_t* map, int i, int j,
++ int src_i, int src_j,
+ std::priority_queue<CellData>& Q,
+ CachedDistanceMap* cdm,
+ unsigned char* marked)
+@@ -95,8 +95,8 @@ void enqueue(map_t* map, unsigned int i, unsigned int j,
+ if(marked[MAP_INDEX(map, i, j)])
+ return;
+
+- unsigned int di = abs(i - src_i);
+- unsigned int dj = abs(j - src_j);
++ int di = abs(i - src_i);
++ int dj = abs(j - src_j);
+ double distance = cdm->distances_[di][dj];
+
+ if(distance > cdm->cell_radius_)