There is a Implicit rule in Makefiles for C++ files, that use .C or .cc extension. But I usually have the .cpp file extension for C++ source.
How to use the Implicit rule for Makefile with .cpp files?
2 Answers
See Catalogue of Implicit Rules:
Compiling C++ programs
n.o is made automatically from n.cc, n.cpp, or n.C with a recipe of the form ‘$(CXX) $(CPPFLAGS) $(CXXFLAGS) -c’. We encourage you to use the suffix ‘.cc’ for C++ source files instead of ‘.C’.
answered Jan 28, 2013 at 20:54
Maxim Egorushkin
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This is from GNU make docs.
‘%’ in a prerequisite of a pattern rule stands for the same stem that was matched by the ‘%’ in the target. In order for the pattern rule to apply, its target pattern must match the file name under consideration and all of its prerequisites (after pattern substitution) must name files that exist or can be made. These files become prerequisites of the target. Thus, a rule of the form
%.o : %.c ; recipe...specifies how to make a file n.o, with another file n.c as its prerequisite, provided that n.c exists or can be made.
So you could try something similar to
%.o : %.cpp %.hpp
$(CC) $(CFLAGS) $@
2 Comments
Zhen
Ok, I see the problem, I looked on an old doc page. Now .cpp is also used.
Maxim Egorushkin
Not sure why it refers to some possibly outdated copy of the original GNU make documentation. If you just google for "gnu make manual" the original up-to-date documentation comes up as the first result.
.cppshould work fine for C++..Cis usually forCcode..Cis for C++ too..cis for C..cppshould work for C++ out of the box.