makefiles: fix gprof and add gcov

[fabian18]

Contribution description

Fixing gprof targets.

Testing procedure

This would fail on master

gprof for profiling

cd tests/unittests
make clean all-gprof term-gprof
make eval-gprf > gprof.txt

gcov for coverage

cd tests/unittests
make clean all-gcov term-gcov
make eval-gcovr

Still you will notice that no .gcda are generated. I am trying to find out why.
They should be generated when the program is run (term-gcov) but they are not.

Issues/PRs references

[riot-ci]

Murdock results

❌ FAILED

103c049 wip

Success	Failures	Total	Runtime
7322	0	10222	11m:39s

Artifacts

[fabian18]

no no

Still you will notice that no .gcda are generated.

this is still an issue

[fabian18]

or does it work for you?

sorry, didn't see that this is still WIP

[fabian18]

Honestly I have no clue anymore why the .gcda are not generated. The program exits normally when checking $? and also I tried to call __gcov_dump manually.

[fabian18]

profiling:/home/[email protected]/RIOT/tests/unittests/bin/native64/boards_common_native/board_init.gcda:Cannot open
/home/[email protected]/RIOT/tests/unittests/bin/native64/tests_unittests.elf: getpid(): not implemented
/home/[email protected]/RIOT/tests/unittests/bin/native64/tests_unittests.elf: getpid(): not implemented

int getpid(void)
{
    warnx("getpid(): not implemented");
    return -1;
}

changed to

int getpid(void)
{
    return thread_getpid();;
}

Does not fix it.

[fabian18]

It still fails, but it creates the .gcda files now, but they are empty 😫.
Looking at the source code, I must be past the point of fcntl(), so what can fail afterwards is only fdopen().

[crasbe]

Some minor, general style related things.

[crasbe]

Suggested change

	#include "vfs.h"
	# include "vfs.h"

[crasbe]

Suggested change

	#define FS_NATIVE_MOUNT VFS_DEFAULT_NVM(0)
	# define FS_NATIVE_MOUNT VFS_DEFAULT_NVM(0)