TestCondition::alwaysTrue, TestCondition::alwaysTrueContainer fail on some platforms

[Wolfgang Stöggl]

Hi,
in the meantime, there are 2 failing tests. In the initially reported bug, it was one [1].
Cppcheck version: 2.12.0

Under Fedora, the failing style tests occur under aarch64, ppc64le and s390x. The following architectures are OK: i686, x86_64.

Output from a current build log (e.g. aarch64) [2]:

Number of tests: 4426Number of todos: 331
Tests failed: 2
/builddir/build/BUILD/cppcheck-2.12.0/test/testcondition.cpp:4501(TestCondition::alwaysTrue): Assertion failed.
Expected:
[test.cpp:6]: (style) Condition 'o[1]=='\0'' is always false\n
Actual:
[test.cpp:4] -> [test.cpp:6]: (style) Condition 'o[1]=='\0'' is always false\n

---

/builddir/build/BUILD/cppcheck-2.12.0/test/testcondition.cpp:5014(TestCondition::alwaysTrueContainer): Assertion failed.
Expected:
[test.cpp:5]: (style) Condition 'buffer.back()=='\0'' is always false\n
Actual:
[test.cpp:3] -> [test.cpp:5]: (style) Condition 'buffer.back()=='\0'' is always false\n

---

Best regards
Wolfgang
[1] https://trac.cppcheck.net/ticket/11537[2] https://koji.fedoraproject.org/koji/taskinfo?taskID=105994092

[Wolfgang Stöggl]

As a workaround for now, -fsigned-char can be added to CXXFLAGS.
This makes all tests pass also on aarch64, ppc64le and s390x, where char is unsigned by default.