How do I make sure erroneous code does not build in a CI process?

I am writing some C++ library, and I already use some CI (Continuous Integration) process, to make sure the features work. The build is makefile-based, so the CI script holds a make test line. That target will run the automated tests (say, using Catch), and build passes only if it succeeds.

The good practices mandates that a wrong usage of the library by user code should preferably trigger a compile error, instead of a run-time error. So I included lots of static checking.

However, I want to make sure in my automated testing process that this is really the case (that user code using the library erroneously will fail to build).

So I put up a folder holding several .cpp files, each demonstrating an incorrect usage of the library, thus each of them should fail to build.

My problem is that if I add a new target in my makefile to build these, it will return after first failure.

What I want to do is make sure that all these files fail to build, and return 0 only in that case.

How can I write a target that performs this ?

Some (not working) code, that will return after first failure.

SRC_FILES := $(wildcard *.cpp)
OBJ_FILES := $(patsubst %.cpp, %.o, $(SRC_FILES))

all: $(OBJ_FILES)
    @echo "done"

%.o: %.cpp
    $(CXX) -o $@ -c $<

If I basically ignore the failures (prepending line with -), I won't be able to check that all of the files are incorrect.