[PATCH 2/2] libgloss: xtensa: fix CPPFLAGS clobbering

No sub-Makefile.inc file should ever set CPPFLAGS directly.  That is
a global/common variable.  Instead, ports should set the per-target
CPPFLAGS to include what they need.

Further, per-target CPPFLAGS should respect $(AM_CPPFLAGS).
---
 libgloss/Makefile.in         | 48 +++++++++++++++++++++---------------
 libgloss/xtensa/Makefile.inc | 19 ++++++++++----
 2 files changed, 42 insertions(+), 25 deletions(-)

diff --git a/libgloss/xtensa/Makefile.inc b/libgloss/xtensa/Makefile.inc
index 3ce02c190e8b..4c5c9ada516c 100644
--- a/libgloss/xtensa/Makefile.inc
+++ b/libgloss/xtensa/Makefile.inc
@@ -1,4 +1,4 @@
-CPPFLAGS += -D_LIBGLOSS -I$(srcdir)/%D%/include
+%C%_CPPFLAGS = -D_LIBGLOSS -I$(srcdir)/%D%/include
 
 multilibtool_DATA += \
 	%D%/default.specs \
@@ -25,23 +25,32 @@ multilibtool_DATA += \
 	%D%/sleep.S \
 	%D%/syscalls.c \
 	%D%/window-vectors.S
+%C%_libgloss_a_CPPFLAGS = \
+	$(AM_CPPFLAGS) \
+	$(%C%_CPPFLAGS)
 
 multilibtool_LIBRARIES += %D%/libsys_qemu.a
-%C%_libsys_qemu_a_CPPFLAGS = -DQEMU_SEMIHOSTING
+%C%_libsys_qemu_a_CPPFLAGS = \
+	$(AM_CPPFLAGS) \
+	$(%C%_CPPFLAGS) \
+	-DQEMU_SEMIHOSTING
 %C%_libsys_qemu_a_SOURCES = \
 	%D%/sim-vectors.S \
 	%D%/sim-call.S \
 	%D%/syscalls.c
 
 multilibtool_LIBRARIES += %D%/libsys_openocd.a
-%C%_libsys_openocd_a_CPPFLAGS = -DOPENOCD_SEMIHOSTING
+%C%_libsys_openocd_a_CPPFLAGS = \
+	$(AM_CPPFLAGS) \
+	$(%C%_CPPFLAGS) \
+	-DOPENOCD_SEMIHOSTING
 %C%_libsys_openocd_a_SOURCES = \
 	%D%/syscalls.c
 
 if HAVE_XTENSA_BOARD_ESP32
 multilibtool_DATA += %D%/boards/esp32/memory.elf.ld
 %C%_libgloss_a_SOURCES += %D%/boards/esp32/board.c
-%C%_libgloss_a_CPPFLAGS = -I$(srcdir)/%D%/boards/esp32/include
+%C%_libgloss_a_CPPFLAGS += -I$(srcdir)/%D%/boards/esp32/include
 %C%_libsys_qemu_a_CPPFLAGS += -I$(srcdir)/%D%/boards/esp32/include
 %C%_libsys_openocd_a_CPPFLAGS += -I$(srcdir)/%D%/boards/esp32/include
 endif
@@ -49,7 +58,7 @@ endif
 if HAVE_XTENSA_BOARD_ESP32S3
 multilibtool_DATA += %D%/boards/esp32s3/memory.elf.ld
 %C%_libgloss_a_SOURCES += %D%/boards/esp32s3/board.c
-%C%_libgloss_a_CPPFLAGS = -I$(srcdir)/%D%/boards/esp32s3/include
+%C%_libgloss_a_CPPFLAGS += -I$(srcdir)/%D%/boards/esp32s3/include
 %C%_libsys_qemu_a_CPPFLAGS += -I$(srcdir)/%D%/boards/esp32s3/include
 %C%_libsys_openocd_a_CPPFLAGS += -I$(srcdir)/%D%/boards/esp32s3/include
 endif
-- 
2.43.0