tests: Makefile.am: move -I flags from AM_CFLAGS to AM_CPPFLAGS

* AM_CPPFLAGS is for preprocessor flags like '-I' or '-D',
* AM_CFLAGS is for C (not C++!) compiler flags like '-Wall'.
* AM_CXXFLAGS is for C++ specific compiler flags like '-Wall'.

By having the preprocessor flags in the proper variable we make
sure that they apply to both *.c and *.cpp files.

Change-Id: I7b3504a01e3350834b35c42d8d76d5d88d84a4b9
diff --git a/tests/CommonLibs/Makefile.am b/tests/CommonLibs/Makefile.am
index e6790e6..941badb 100644
--- a/tests/CommonLibs/Makefile.am
+++ b/tests/CommonLibs/Makefile.am
@@ -1,6 +1,17 @@
 include $(top_srcdir)/Makefile.common
 
-AM_CPPFLAGS = -Wall -I$(top_srcdir)/CommonLibs $(STD_DEFINES_AND_INCLUDES) $(LIBOSMOCORE_CFLAGS) $(LIBOSMOCTRL_CFLAGS) $(LIBOSMOVTY_CFLAGS) -g
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/CommonLibs \
+	$(STD_DEFINES_AND_INCLUDES) \
+	$(NULL)
+
+AM_CXXFLAGS = \
+	-Wall -g \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(LIBOSMOCTRL_CFLAGS) \
+	$(LIBOSMOVTY_CFLAGS) \
+	$(NULL)
+
 AM_LDFLAGS = $(LIBOSMOCORE_LIBS) $(LIBOSMOCTRL_LIBS) $(LIBOSMOVTY_LIBS)
 
 EXTRA_DIST = BitVectorTest.ok \
diff --git a/tests/Transceiver52M/Makefile.am b/tests/Transceiver52M/Makefile.am
index 9fae41f..cb22c2a 100644
--- a/tests/Transceiver52M/Makefile.am
+++ b/tests/Transceiver52M/Makefile.am
@@ -1,6 +1,12 @@
 include $(top_srcdir)/Makefile.common
 
-AM_CFLAGS = -Wall -I$(top_srcdir)/Transceiver52M -I$(top_srcdir)/Transceiver52M/arch/common $(STD_DEFINES_AND_INCLUDES) -g
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/Transceiver52M \
+	-I$(top_srcdir)/Transceiver52M/arch/common \
+	$(STD_DEFINES_AND_INCLUDES) \
+	$(NULL)
+
+AM_CFLAGS = -Wall -g
 
 EXTRA_DIST = convolve_test.ok convolve_test_golden.h