host-ncurses: Fix build with gcc 5.1

The build of host-ncurses fails with following error:

| In file included from ../ncurses/curses.priv.h:283:0,
|                  from ../ncurses/lib_gen.c:19:
| _16905.c:835:15: error: expected ')' before 'int'
| ../include/curses.h:1594:56: note: in definition of macro 'mouse_trafo'
|  #define mouse_trafo(y,x,to_screen) wmouse_trafo(stdscr,y,x,to_screen)

The problem is that the preprocessor emits additional line statements which
ncurses isn't prepared for. The problem is described in the gcc 5 porting
guide at https://gcc.gnu.org/gcc-5/porting_to.html. Adding the described
-P option to gcc invocations fixes that issue.

Signed-off-by: Bernhard Walle <bernhard@bwalle.de>
[mol: use HOST_NCURSES_CPPFLAGS to add -P]
Signed-off-by: Michael Olbrich <m.olbrich@pengutronix.de>

1 files changed, 2 insertions, 0 deletions

diff --git a/rules/host-ncurses.make b/rules/host-ncurses.make
index 2218b7c9d..3d60d9ae8 100644
--- a/rules/host-ncurses.make
+++ b/rules/host-ncurses.make
@@ -25,6 +25,8 @@ HOST_NCURSES_CONF_OPT	= \
 	$(HOST_AUTOCONF) \
 	$(NCURSES_AUTOCONF_SHARED)
 
+HOST_NCURSES_CPPFLAGS	:= -P
+
 # ----------------------------------------------------------------------------
 # Install
 # ----------------------------------------------------------------------------