Fix: Don't override user variables within the build system

[lttng-ust.git] / doc / examples / demo / Makefile

diff --git a/doc/examples/demo/Makefile b/doc/examples/demo/Makefile
index 41f4321084760da8b8d6d25dd8459c75926fd62e..6272a2ba1081e1e1644c82c9a120952bfc199e29 100644 (file)
--- a/doc/examples/demo/Makefile
+++ b/doc/examples/demo/Makefile
@@ -8,34 +8,45 @@
 # Permission to modify the code and to distribute modified code is
 # granted, provided the above notices are retained, and a notice that
 # the code was modified is included with the above copyright notice.
+#
+# This Makefile is not using automake so that users may see how to build
+# a program with tracepoint provider probes as stand-alone shared objects.
+#
+# This makefile is purposefully kept simple to support GNU and BSD make.
 
-# This Makefile is not using automake so that people may see how to build
-# a program and tracepoint provider probes as stand-alone shared objects.
-
-CC = gcc
 LIBS = -ldl    # On Linux
 #LIBS = -lc    # On BSD
-CFLAGS = -I.
+LOCAL_CPPFLAGS += -I.
 
 all: demo lttng-ust-provider-ust-tests-demo.so lttng-ust-provider-ust-tests-demo3.so
 
-lttng-ust-provider-ust-tests-demo.o: tp.c tp2.c ust_tests_demo.h ust_tests_demo2.h
-       $(CC) $(CFLAGS) -fpic -c -o $@ $<
+tp.o: tp.c ust_tests_demo.h
+       $(CC) $(CPPFLAGS) $(LOCAL_CPPFLAGS) $(AM_CFLAGS) $(AM_CPPFLAGS) \
+               $(CFLAGS) -fpic -c -o $@ $<
+
+tp2.o: tp2.c ust_tests_demo2.h
+       $(CC) $(CPPFLAGS) $(LOCAL_CPPFLAGS) $(AM_CFLAGS) $(AM_CPPFLAGS) \
+               $(CFLAGS) -fpic -c -o $@ $<
 
-lttng-ust-provider-ust-tests-demo.so: lttng-ust-provider-ust-tests-demo.o
-       $(CC) -shared -o $@ -llttng-ust $<
+lttng-ust-provider-ust-tests-demo.so: tp.o tp2.o
+       $(CC) -shared -Wl,--no-as-needed -o $@ $(LDFLAGS) $(AM_CFLAGS) \
+               $(AM_LDFLAGS) $(CFLAGS) -llttng-ust tp.o tp2.o
 
-lttng-ust-provider-ust-tests-demo3.o: tp3.c ust_tests_demo3.h
-       $(CC) $(CFLAGS) -fpic -c -o $@ $<
+tp3.o: tp3.c ust_tests_demo3.h
+       $(CC) $(CPPFLAGS) $(LOCAL_CPPFLAGS) $(AM_CFLAGS) $(AM_CPPFLAGS) \
+               $(CFLAGS) -fpic -c -o $@ $<
 
-lttng-ust-provider-ust-tests-demo3.so: lttng-ust-provider-ust-tests-demo3.o
-       $(CC) -shared -o $@ -llttng-ust $<
+lttng-ust-provider-ust-tests-demo3.so: tp3.o
+       $(CC) -shared -Wl,--no-as-needed -o $@ $(LDFLAGS) $(AM_CFLAGS) \
+               $(AM_LDFLAGS) $(CFLAGS) -llttng-ust tp3.o
 
 demo.o: demo.c
-       $(CC) $(CFLAGS) -c -o $@ $<
+       $(CC) $(CPPFLAGS) $(LOCAL_CPPFLAGS) $(AM_CFLAGS) $(AM_CPPFLAGS) \
+               $(CFLAGS) -c -o $@ $<
 
 demo: demo.o
-       $(CC) demo.o -o $@ $(LIBS)
+       $(CC) $(LDFLAGS) $(AM_CFLAGS) $(AM_LDFLAGS) $(CFLAGS) \
+               -o $@ demo.o $(LIBS)
 
 .PHONY: clean
 clean: