Add C++ tests and fix corresponding links

DBCSR.md

@@ -10,6 +10,7 @@ github: https://github.com/cp2k/dbcsr/blob/master/AUTHORS
 fpp_extensions: F
 fixed_extensions:
 extensions: F
+preprocessor: cpp -traditional-cpp -E -Wno-invalid-pp-token
 include: ../src
 predocmark: >
 media_dir: @CMAKE_SOURCE_DIR@/docs/media
@@ -29,6 +30,8 @@ graph: false
 search: false
 favicon: @CMAKE_SOURCE_DIR@/docs/media/logo/logo.png
 version: @dbcsr_VERSION@
+exclude: Makefile
+extra_filetypes: cpp #
 ---
 
 --------------------

docs/guide/2-user-guide/2-tests/index.md

@@ -9,13 +9,13 @@ title: Tests
 - [[dbcsr_test_csr_conversions(program)]] (fortran) : test DBCSR to CSR conversion with random matrices
 - [[dbcsr_tas_unittest(program)]] (fortran) : unit test for tall-and-skinny matrices
 - [[dbcsr_tensor_unittest(program)]] (fortran) : unit test for tensor functionalities
-- [dbcsr_tensor_test](../../../../tests/dbcsr_tensor_test.cpp) (c++) : test the tensor contraction (13|2)x(54|21)=(3|45) 31 and other functions
+- [dbcsr_tensor_test](../../../sourcefile/dbcsr_tensor_test.cpp.html) (c++) : test the tensor contraction (13|2)x(54|21)=(3|45) 31 and other functions
 
 ### GPU-backend correctness tests:
 
 - [[dbcsr_unittest_3(program)]] (fortran) : test matrix-multiply with various block sizes that are run by the libsmm_acc GPU backend if DBCSR is compiled with GPU support
-- [libsmm_acc_unittest_multiply](../../../../tests/libsmm_acc_unittest_multiply.cpp) (c++) : tests all libsmm_acc transpose kernels
-- [libsmm_acc_unittest_transpose](../../../../tests/libsmm_acc_unittest_transpose.cpp) (c++) : tests all libsmm_acc batch-multiplication kernels
+- [libsmm_acc_unittest_multiply](../../../sourcefile/libsmm_acc_unittest_multiply.cpp.html) (c++) : tests all libsmm_acc transpose kernels
+- [libsmm_acc_unittest_transpose](../../../sourcefile/libsmm_acc_unittest_transpose.cpp.html) (c++) : tests all libsmm_acc batch-multiplication kernels
 
 ## Performance tests
 
@@ -25,7 +25,7 @@ DBCSR performance tests:
 
 ### GPU backend performance tests:
 
-- [libsmm_acc_timer_multiply](../../../../tests/libsmm_acc_timer_multiply.cpp) (c++) : time all libsmm_acc batch-multiplication kernels
+- [libsmm_acc_timer_multiply](../../../sourcefile/libsmm_acc_timer_multiply.cpp.html) (c++) : time all libsmm_acc batch-multiplication kernels
 
 ## Running Tests
 
@@ -68,4 +68,3 @@ export OMP_NUM_THREADS=[t]; mpirun -np [n] ./build/tests/dbcsr_perf tests/input.
 Examples of input files can be found in `tests/inputs` for different sizes of matrices and different block sizes.
 
 You can also write custom input files: for more information, follow the template in `tests/input.perf`.
-