Merge pull request #2026 from justin6case/example_makefile_improvements

Example/sample makefile improvements

googletest/make/Makefile

@@ -16,6 +16,9 @@
 # Remember to tweak this if you move this file.
 GTEST_DIR = ..
 
+# Points to the location of the Google Test libraries
+GTEST_LIB_DIR = .
+
 # Where to find user code.
 USER_DIR = ../samples
 
@@ -27,6 +30,9 @@ CPPFLAGS += -isystem $(GTEST_DIR)/include
 # Flags passed to the C++ compiler.
 CXXFLAGS += -g -Wall -Wextra -pthread -std=c++11
 
+# Google Test libraries
+GTEST_LIBS = libgtest.a libgtest_main.a
+
 # All tests produced by this Makefile.  Remember to add new tests you
 # created to the list.
 TESTS = sample1_unittest
@@ -38,10 +44,10 @@ GTEST_HEADERS = $(GTEST_DIR)/include/gtest/*.h \
 
 # House-keeping build targets.
 
-all : $(TESTS)
+all : $(GTEST_LIBS) $(TESTS)
 
 clean :
-	rm -f $(TESTS) gtest.a gtest_main.a *.o
+	rm -f $(GTEST_LIBS) $(TESTS) *.o
 
 # Builds gtest.a and gtest_main.a.
 
@@ -61,10 +67,10 @@ gtest_main.o : $(GTEST_SRCS_)
 	$(CXX) $(CPPFLAGS) -I$(GTEST_DIR) $(CXXFLAGS) -c \
             $(GTEST_DIR)/src/gtest_main.cc
 
-gtest.a : gtest-all.o
+libgtest.a : gtest-all.o
 	$(AR) $(ARFLAGS) $@ $^
 
-gtest_main.a : gtest-all.o gtest_main.o
+libgtest_main.a : gtest-all.o gtest_main.o
 	$(AR) $(ARFLAGS) $@ $^
 
 # Builds a sample test.  A test should link with either gtest.a or
@@ -78,5 +84,5 @@ sample1_unittest.o : $(USER_DIR)/sample1_unittest.cc \
                      $(USER_DIR)/sample1.h $(GTEST_HEADERS)
 	$(CXX) $(CPPFLAGS) $(CXXFLAGS) -c $(USER_DIR)/sample1_unittest.cc
 
-sample1_unittest : sample1.o sample1_unittest.o gtest_main.a
-	$(CXX) $(CPPFLAGS) $(CXXFLAGS) -lpthread $^ -o $@
+sample1_unittest : sample1.o sample1_unittest.o $(GTEST_LIBS)
+	$(CXX) $(CPPFLAGS) $(CXXFLAGS) -L$(GTEST_LIB_DIR) -lgtest_main -lpthread $^ -o $@