New ztest API: build failure on qemu_cortex_m3 when CONFIG_CMAKE_LINKER_GENERATOR=y

[LixinGuoX]

Describe the bug
I am migrating tests/kernel/xip,tests/kernel/context,tests/kernel/early_sleep to new ztest API, see #47124, #47231, #47229.
Those tests all use CONFIG_CMAKE_LINKER_GENERATOR on qemu_cortex_m3.
Then I got a CI build failure.

To Reproduce
Steps to reproduce the behavior:

1. try build tests/kernel/xip on qemu_cortex_m3 with new ztest API

Expected behavior
Tests should pass.

Impact
CI blocked.

Logs and console output

[134/145] Building C object zephyr/kernel/CMakeFiles/kernel.dir/sched.c.obj
[135/145] Linking C static library zephyr/kernel/libkernel.a
[136/145] Linking C executable zephyr/zephyr_pre0.elf
FAILED: zephyr/zephyr_pre0.elf zephyr/zephyr_pre0.map 
: && ccache /opt/toolchains/zephyr-sdk-0.14.2/arm-zephyr-eabi/bin/arm-zephyr-eabi-gcc   zephyr/CMakeFiles/zephyr_pre0.dir/misc/empty_file.c.obj -o zephyr/zephyr_pre0.elf  -fuse-ld=bfd  -Wl,-T  zephyr/linker_zephyr_pre0.cmd  -Wl,-Map=/__w/zephyr/zephyr/twister-out/qemu_cortex_m3/tests/kernel/xip/arch.common.xip.linker_generator/zephyr/zephyr_pre0.map  -Wl,--whole-archive  app/libapp.a  zephyr/libzephyr.a  zephyr/arch/common/libarch__common.a  zephyr/arch/arch/arm/core/aarch32/libarch__arm__core__aarch32.a  zephyr/arch/arch/arm/core/aarch32/cortex_m/libarch__arm__core__aarch32__cortex_m.a  zephyr/lib/libc/minimal/liblib__libc__minimal.a  zephyr/lib/posix/liblib__posix.a  zephyr/soc/arm/ti_lm3s6965/libsoc__arm__ti_lm3s6965.a  zephyr/subsys/testsuite/ztest/libsubsys__testsuite__ztest.a  zephyr/drivers/console/libdrivers__console.a  zephyr/drivers/serial/libdrivers__serial.a  zephyr/drivers/timer/libdrivers__timer.a  -Wl,--no-whole-archive  zephyr/kernel/libkernel.a  zephyr/CMakeFiles/offsets.dir/./arch/arm/core/offsets/offsets.c.obj  -L"/opt/toolchains/zephyr-sdk-0.14.2/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/10.3.0/thumb/v7-m/nofp"  -L/__w/zephyr/zephyr/twister-out/qemu_cortex_m3/tests/kernel/xip/arch.common.xip.linker_generator/zephyr  -lgcc  zephyr/arch/common/libisr_tables.a  -no-pie  -mcpu=cortex-m3  -mthumb  -mabi=aapcs  -mfp16-format=ieee  -Wl,--gc-sections  -Wl,--build-id=none  -Wl,--sort-common=descending  -Wl,--sort-section=alignment  -Wl,-u,_OffsetAbsSyms  -Wl,-u,_ConfigAbsSyms  -nostdlib  -static  -Wl,-X  -Wl,-N  -Wl,--orphan-handling=warn  -Wl,--fatal-warnings && cd /__w/zephyr/zephyr/twister-out/qemu_cortex_m3/tests/kernel/xip/arch.common.xip.linker_generator/zephyr && /usr/local/bin/cmake -E echo
/opt/toolchains/zephyr-sdk-0.14.2/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/10.3.0/../../../../arm-zephyr-eabi/bin/ld.bfd: zephyr/subsys/testsuite/ztest/libsubsys__testsuite__ztest.a(ztest_new.c.obj): in function `run_test_rules':
/__w/zephyr/zephyr/subsys/testsuite/ztest/src/ztest_new.c:196: undefined reference to `_ztest_test_rule_list_start'
/opt/toolchains/zephyr-sdk-0.14.2/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/10.3.0/../../../../arm-zephyr-eabi/bin/ld.bfd: /__w/zephyr/zephyr/subsys/testsuite/ztest/src/ztest_new.c:196: undefined reference to `_ztest_test_rule_list_end'
/opt/toolchains/zephyr-sdk-0.14.2/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/10.3.0/../../../../arm-zephyr-eabi/bin/ld.bfd: zephyr/subsys/testsuite/ztest/libsubsys__testsuite__ztest.a(ztest_new.c.obj): in function `z_ztest_get_next_test':
/__w/zephyr/zephyr/subsys/testsuite/ztest/src/ztest_new.c:469: undefined reference to `_ztest_unit_test_list_end'
/opt/toolchains/zephyr-sdk-0.14.2/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/10.3.0/../../../../arm-zephyr-eabi/bin/ld.bfd: /__w/zephyr/zephyr/subsys/testsuite/ztest/src/ztest_new.c:469: undefined reference to `_ztest_unit_test_list_start'
/opt/toolchains/zephyr-sdk-0.14.2/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/10.3.0/../../../../arm-zephyr-eabi/bin/ld.bfd: zephyr/subsys/testsuite/ztest/libsubsys__testsuite__ztest.a(ztest_new.c.obj): in function `z_ztest_run_test_suite_ptr':
/__w/zephyr/zephyr/subsys/testsuite/ztest/src/ztest_new.c:556: undefined reference to `_ztest_test_rule_list_start'
/opt/toolchains/zephyr-sdk-0.14.2/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/10.3.0/../../../../arm-zephyr-eabi/bin/ld.bfd: /__w/zephyr/zephyr/subsys/testsuite/ztest/src/ztest_new.c:556: undefined reference to `_ztest_test_rule_list_end'
/opt/toolchains/zephyr-sdk-0.14.2/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/10.3.0/../../../../arm-zephyr-eabi/bin/ld.bfd: zephyr/subsys/testsuite/ztest/libsubsys__testsuite__ztest.a(ztest_new.c.obj): in function `ztest_verify_all_test_suites_ran':
/__w/zephyr/zephyr/subsys/testsuite/ztest/src/ztest_new.c:639: undefined reference to `_ztest_unit_test_list_start'
/opt/toolchains/zephyr-sdk-0.14.2/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/10.3.0/../../../../arm-zephyr-eabi/bin/ld.bfd: /__w/zephyr/zephyr/subsys/testsuite/ztest/src/ztest_new.c:639: undefined reference to `_ztest_unit_test_list_end'
collect2: error: ld returned 1 exit status
ninja: build stopped: subcommand failed.

[LixinGuoX]

Anyone help to look at this issue?

[carlescufi]

@tejlmand FYI