scripts: coverage: gcovr to ignore negative counters

Apply a workaround for an issue introduced with bc8b7dd
for code coverage collection at qemu_x86 when gcov data
was broken because of optimized out memcpy() in write_u64()
static inline function, so gcovr parser fails with
"gcovr.gcov_parser.NegativeHits: Got negative hit value
in gcov line 'branch  1 taken -1'".

Add gcovr command line option to ignore such errors (since v.6.0):
"--gcov-ignore-parse-errors=negative_hits.warn_once_per_file"

Signed-off-by: Dmitrii Golovanov <dmitrii.golovanov@intel.com>

scripts/pylib/twister/twisterlib/coverage.py

@@ -221,11 +221,11 @@ def _generate(self, outdir, coveragelog):
  excludes = Gcovr._interleave_list("-e", self.ignores)
 
  # We want to remove tests/* and tests/ztest/test/* but save tests/ztest
- cmd = ["gcovr", "-r", self.base_dir, "--gcov-executable",
- str(self.gcov_tool), "-e", "tests/*"] + excludes + ["--json",
-  "-o",
-  coveragefile,
-   outdir]
+ cmd = ["gcovr", "-r", self.base_dir,
+ "--gcov-ignore-parse-errors=negative_hits.warn_once_per_file",
+ "--gcov-executable", str(self.gcov_tool),
+ "-e", "tests/*"]
+ cmd += excludes + ["--json", "-o", coveragefile, outdir]
  cmd_str = " ".join(cmd)
  logger.debug(f"Running {cmd_str}...")
  subprocess.call(cmd, stdout=coveragelog)

scripts/requirements-build-test.txt

@@ -10,7 +10,7 @@ colorama
 ply>=3.10
 
 # used for code coverage
-gcovr>=4.2
+gcovr>=6.0
 coverage
 
 # used for west-command testing