mysql-cmake/mysql-multilib eclasses: set STACK_DIRECTION to fix cross-compiles

eclass/mysql-cmake.eclass

@@ -16,7 +16,7 @@
 # the src_prepare, src_configure, src_compile, and src_install
 # phase hooks.
 
-inherit cmake-utils flag-o-matic multilib prefix eutils
+inherit cmake-utils flag-o-matic multilib prefix eutils toolchain-funcs
 
 #
 # HELPER FUNCTIONS:
@@ -243,6 +243,10 @@ configure_cmake_standard() {
 		if mysql_version_is_at_least "10.1.2" ; then
 			mycmakeargs+=( $(mysql-cmake_use_plugin cracklib CRACKLIB_PASSWORD_CHECK ) )
 		fi
+
+		# The build forces this to be defined when cross-compiling.  We pass it
+		# all the time for simplicity and to make sure it is actually correct.
+		mycmakeargs+=( -DSTACK_DIRECTION=$(tc-stack-grows-down && echo -1 || echo 1) )
 	else
 		mycmakeargs+=( $(cmake-utils_use_with extraengine FEDERATED_STORAGE_ENGINE) )
 	fi

eclass/mysql-multilib-r1.eclass

@@ -401,6 +401,9 @@ multilib_src_configure() {
 		-DWITH_DEFAULT_FEATURE_SET=0
 		-DINSTALL_SYSTEMD_UNITDIR="$(systemd_get_systemunitdir)"
 		-DENABLE_STATIC_LIBS=$(usex static-libs)
+		# The build forces this to be defined when cross-compiling.  We pass it
+		# all the time for simplicity and to make sure it is actually correct.
+		-DSTACK_DIRECTION=$(tc-stack-grows-down && echo -1 || echo 1)
 	)
 
 	if use test ; then

eclass/toolchain-funcs.eclass

@@ -221,6 +221,21 @@ tc-is-static-only() {
 	[[ ${host} == *-mint* ]]
 }
 
+# @FUNCTION: tc-stack-grows-down
+# @DESCRIPTION:
+# Return shell true if the stack grows down.  This is the default behavior
+# for the vast majority of systems out there and usually projects shouldn't
+# care about such internal details.
+tc-stack-grows-down() {
+	# List the few that grow up.
+	case ${ARCH} in
+	hppa|metag) return 1 ;;
+	esac
+
+	# Assume all others grow down.
+	return 0
+}
+
 # @FUNCTION: tc-export_build_env
 # @USAGE: [compiler variables]
 # @DESCRIPTION: