Disable mem-access warnings on aarch64. (ros#506)

* Disable mem-access warnings on aarch64.

There is currently a bug in Eigen in Ubuntu 22.04 meaning
that it throws a mem-access warning every time Eigen/PacketMath.h
is used.  There is an upstream fix for it, and we are trying
to get that into Ubuntu 22.04, but that is not guaranteed.
For now, disable the warning only if we are on GCC.

Signed-off-by: Chris Lalancette <[email protected]>

tf2_eigen/test/tf2_eigen-test.cpp

@@ -37,7 +37,20 @@
 #include <cmath>
 #include <memory>
 
+// Version 3.4.0 of Eigen in Ubuntu 22.04 has a bug that causes -Wclass-memaccess warnings on
+// aarch64.  Upstream Eigen has already fixed this in
+// https://gitlab.com/libeigen/eigen/-/merge_requests/645 .  The Debian fix for this is in
+// https://salsa.debian.org/science-team/eigen3/-/merge_requests/1 .
+// However, it is not clear that that fix is going to make it into Ubuntu 22.04 before it
+// freezes, so disable the warning here.
+#ifdef __GNUC__
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wclass-memaccess"
+#endif
 #include <Eigen/Geometry>  // NOLINT
+#ifdef __GNUC__
+#pragma GCC diagnostic pop
+#endif
 
 #include "gtest/gtest.h"
 

tf2_sensor_msgs/include/tf2_sensor_msgs/tf2_sensor_msgs.hpp

@@ -31,8 +31,21 @@
 
 #include <string>
 
+// Version 3.4.0 of Eigen in Ubuntu 22.04 has a bug that causes -Wclass-memaccess warnings on
+// aarch64.  Upstream Eigen has already fixed this in
+// https://gitlab.com/libeigen/eigen/-/merge_requests/645 .  The Debian fix for this is in
+// https://salsa.debian.org/science-team/eigen3/-/merge_requests/1 .
+// However, it is not clear that that fix is going to make it into Ubuntu 22.04 before it
+// freezes, so disable the warning here.
+#ifdef __GNUC__
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wclass-memaccess"
+#endif
 #include <Eigen/Eigen>  // NOLINT
 #include <Eigen/Geometry>  // NOLINT
+#ifdef __GNUC__
+#pragma GCC diagnostic pop
+#endif
 
 #include "tf2_ros/buffer_interface.h"