```(cambridge-spark-setup) fpn17@gpu07::~/CLionProjects/cambridge-spark-setup$ g++ -H test/resources/sample_projects/simple_math_project_done/src/double.cpp
. test/resources/sample_projects/simple_math_project_done/src/double.hpp
.. /usr/include/c++/7/math.h
... /usr/include/c++/7/cmath
.... /usr/include/x86_64-linux-gnu/c++/7/bits/c++config.h
..... /usr/include/x86_64-linux-gnu/c++/7/bits/os_defines.h
...... /usr/include/features.h
....... /usr/include/x86_64-linux-gnu/sys/cdefs.h
........ /usr/include/x86_64-linux-gnu/bits/wordsize.h
........ /usr/include/x86_64-linux-gnu/bits/long-double.h
....... /usr/include/x86_64-linux-gnu/gnu/stubs.h
........ /usr/include/x86_64-linux-gnu/gnu/stubs-64.h
..... /usr/include/x86_64-linux-gnu/c++/7/bits/cpu_defines.h
.... /usr/include/c++/7/bits/cpp_type_traits.h
.... /usr/include/c++/7/ext/type_traits.h
.... /usr/include/math.h
..... /usr/include/x86_64-linux-gnu/bits/libc-header-start.h
..... /usr/include/x86_64-linux-gnu/bits/types.h
...... /usr/include/x86_64-linux-gnu/bits/wordsize.h
...... /usr/include/x86_64-linux-gnu/bits/typesizes.h
..... /usr/include/x86_64-linux-gnu/bits/math-vector.h
...... /usr/include/x86_64-linux-gnu/bits/libm-simd-decl-stubs.h
..... /usr/include/x86_64-linux-gnu/bits/floatn.h
...... /usr/include/x86_64-linux-gnu/bits/floatn-common.h
....... /usr/include/x86_64-linux-gnu/bits/long-double.h
..... /usr/include/x86_64-linux-gnu/bits/flt-eval-method.h
..... /usr/include/x86_64-linux-gnu/bits/fp-logb.h
..... /usr/include/x86_64-linux-gnu/bits/fp-fast.h
..... /usr/include/x86_64-linux-gnu/bits/mathcalls-helper-functions.h
..... /usr/include/x86_64-linux-gnu/bits/mathcalls.h
..... /usr/include/x86_64-linux-gnu/bits/mathcalls-helper-functions.h
..... /usr/include/x86_64-linux-gnu/bits/mathcalls.h
..... /usr/include/x86_64-linux-gnu/bits/mathcalls-helper-functions.h
..... /usr/include/x86_64-linux-gnu/bits/mathcalls.h
..... /usr/include/x86_64-linux-gnu/bits/mathcalls.h
..... /usr/include/x86_64-linux-gnu/bits/mathcalls.h
..... /usr/include/x86_64-linux-gnu/bits/mathcalls-helper-functions.h
..... /usr/include/x86_64-linux-gnu/bits/mathcalls.h
..... /usr/include/x86_64-linux-gnu/bits/mathcalls.h
..... /usr/include/x86_64-linux-gnu/bits/mathcalls.h
..... /usr/include/x86_64-linux-gnu/bits/iscanonical.h
.... /usr/include/c++/7/bits/std_abs.h
..... /usr/include/stdlib.h
...... /usr/include/x86_64-linux-gnu/bits/libc-header-start.h
...... /usr/lib/gcc/x86_64-linux-gnu/7/include/stddef.h
...... /usr/include/x86_64-linux-gnu/bits/waitflags.h
...... /usr/include/x86_64-linux-gnu/bits/waitstatus.h
...... /usr/include/x86_64-linux-gnu/bits/types/locale_t.h
....... /usr/include/x86_64-linux-gnu/bits/types/__locale_t.h
...... /usr/include/x86_64-linux-gnu/sys/types.h
....... /usr/include/x86_64-linux-gnu/bits/types/clock_t.h
....... /usr/include/x86_64-linux-gnu/bits/types/clockid_t.h
....... /usr/include/x86_64-linux-gnu/bits/types/time_t.h
....... /usr/include/x86_64-linux-gnu/bits/types/timer_t.h
....... /usr/lib/gcc/x86_64-linux-gnu/7/include/stddef.h
....... /usr/include/x86_64-linux-gnu/bits/stdint-intn.h
....... /usr/include/endian.h
........ /usr/include/x86_64-linux-gnu/bits/endian.h
........ /usr/include/x86_64-linux-gnu/bits/byteswap.h
......... /usr/include/x86_64-linux-gnu/bits/wordsize.h
......... /usr/include/x86_64-linux-gnu/bits/byteswap-16.h
........ /usr/include/x86_64-linux-gnu/bits/uintn-identity.h
....... /usr/include/x86_64-linux-gnu/sys/select.h
........ /usr/include/x86_64-linux-gnu/bits/select.h
......... /usr/include/x86_64-linux-gnu/bits/wordsize.h
........ /usr/include/x86_64-linux-gnu/bits/types/sigset_t.h
......... /usr/include/x86_64-linux-gnu/bits/types/__sigset_t.h
........ /usr/include/x86_64-linux-gnu/bits/types/struct_timeval.h
........ /usr/include/x86_64-linux-gnu/bits/types/struct_timespec.h
....... /usr/include/x86_64-linux-gnu/sys/sysmacros.h
........ /usr/include/x86_64-linux-gnu/bits/sysmacros.h
....... /usr/include/x86_64-linux-gnu/bits/pthreadtypes.h
........ /usr/include/x86_64-linux-gnu/bits/thread-shared-types.h
......... /usr/include/x86_64-linux-gnu/bits/pthreadtypes-arch.h
.......... /usr/include/x86_64-linux-gnu/bits/wordsize.h
...... /usr/include/alloca.h
....... /usr/lib/gcc/x86_64-linux-gnu/7/include/stddef.h
...... /usr/include/x86_64-linux-gnu/bits/stdlib-float.h
.. /usr/include/c++/7/cmath
Multiple include guards may be useful for:
/usr/include/x86_64-linux-gnu/bits/byteswap-16.h
/usr/include/x86_64-linux-gnu/bits/byteswap.h
/usr/include/x86_64-linux-gnu/bits/endian.h
/usr/include/x86_64-linux-gnu/bits/flt-eval-method.h
/usr/include/x86_64-linux-gnu/bits/fp-fast.h
/usr/include/x86_64-linux-gnu/bits/fp-logb.h
/usr/include/x86_64-linux-gnu/bits/iscanonical.h
/usr/include/x86_64-linux-gnu/bits/libm-simd-decl-stubs.h
/usr/include/x86_64-linux-gnu/bits/math-vector.h
/usr/include/x86_64-linux-gnu/bits/select.h
/usr/include/x86_64-linux-gnu/bits/stdlib-float.h
/usr/include/x86_64-linux-gnu/bits/typesizes.h
/usr/include/x86_64-linux-gnu/bits/uintn-identity.h
/usr/include/x86_64-linux-gnu/bits/waitflags.h
/usr/include/x86_64-linux-gnu/bits/waitstatus.h
/usr/include/x86_64-linux-gnu/gnu/stubs-64.h
/usr/include/x86_64-linux-gnu/gnu/stubs.h
test/resources/sample_projects/simple_math_project_done/src/double.hpp
/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/Scrt1.o: In function `_start':
(.text+0x20): undefined reference to `main'
collect2: error: ld returned 1 exit status
```