Coverage reporting hangs for C++ tests on X86 qemu

[vanwinkeljan]

Describe the bug

When C++ related tests are executed with coverage reporting on X86 Qemu, Qemu will end up in endless loop when dumping coverage results to UART.

To Reproduce

Steps to reproduce the behavior:

1. Remove platform_exclude: qemu_x86_coverage from tests/application_development/libcxx/testcase.yaml
2. sanitycheck -N -p qemu_x86_coverage -s tests/application_development/libcxx/misc.app_dev.libcxx

Expected behavior

C++ tests can run with coverage enabled on Qemu X86 without hanging.

Impact

No coverage reports can be generated for C++ test cases

Environment (please complete the following information):

• OS: Linux - Ubuntu 18.04.3
• Toolchain: Zephyr SDK 10.03
• Commit SHA: 86461ac

Additional context

Quick look with gdb reveals that the while loop in gcov_coverage_dump is an endless loop

zephyr/subsys/testsuite/coverage/coverage.c

Line 223 in 6d9af83

void gcov_coverage_dump(void)

[carlescufi]

@nashif any ideas about this one?

[github-actions]

This issue has been marked as stale because it has been open (more than) 60 days with no activity. Remove the stale label or add a comment saying that you would like to have the label removed otherwise this issue will automatically be closed in 14 days. Note, that you can always re-open a closed issue at any time.

[nashif]

well, we never got c++ code to work with coverage, Zephyr is all C and the intention of coverage is C code primarily, so closing. If someone has time, patches to support C++ code are welcome.