Build error when compiling for multiple targets platforms

[pepepr08]

Describe the bug
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To Reproduce
Steps to reproduce the behavior:

1. Have multiple targets in targets.cmake. e.g.:

# Set targets to build base on TARGET env variable (set by Makefile)
if($ENV{TARGET} STREQUAL "all")
  message(STATUS "All targets selected")
  SET(MISSION_CPUNAMES pclinux devboard)
else()
  SET(MISSION_CPUNAMES $ENV{TARGET})
endif()

SET(COMMON_LAB_APPS ci_lab to_lab sch_lab)

SET(pclinux_PROCESSORID 1)
SET(pclinux_APPLIST ${COMMON_LAB_APPS})
SET(pclinux_FILELIST cfe_es_startup.scr)
SET(pclinux_SYSTEM pc-linux)

SET(devboard_PROCESSORID 1)
SET(devboard_APPLIST ${COMMON_LAB_APPS} snafu_lib cdh_lib spw)
SET(devboard_FILELIST cfe_es_startup.scr)
SET(devboard_SYSTEM leon3-gaisler-rtems5)

2. Compile using the following command: make SIMULATION=native ENABLE_UNIT_TESTS=true -j install

3. See error:

/home/gitlab-runner/builds/glrt-hNz/0/DS_SW/ds_cfs/build/src/cfe_platform_list.c:6:37: error: ISO C does not allow extra ‘;’ outside of a function [-Werror=pedantic]
    6 | CFE_PLATFORM(native_default_pclinux);CFE_PLATFORM(native_default_devboard)
      |                                     ^
/home/gitlab-runner/builds/glrt-hNz/0/DS_SW/ds_cfs/build/src/cfe_platform_list.c:12:37: error: expected expression before ‘;’ token
   12 | CFE_PLATFORM(native_default_pclinux);CFE_PLATFORM(native_default_devboard)
      |                                     ^
cc1: all warnings being treated as errors
make[4]: *** [cfeconfig_platformdata_tool/CMakeFiles/cfeconfig_platformdata_tool.dir/build.make:89: cfeconfig_platformdata_tool/CMakeFiles/cfeconfig_platformdata_tool.dir/__/src/cfe_platform_list.c.o] Error 1
make[4]: *** Waiting for unfinished jobs....
make[3]: *** [CMakeFiles/Makefile2:1133: cfeconfig_platformdata_tool/CMakeFiles/cfeconfig_platformdata_tool.dir/all] Error 2
make[3]: *** Waiting for unfinished jobs....
[ 58%] Linking C executable elf2cfetbl
[ 58%] Built target elf2cfetbl
[ 58%] Built target cfe-module-version
make[2]: *** [CMakeFiles/Makefile2:510: CMakeFiles/mission-install.dir/rule] Error 2
make[1]: *** [Makefile:227: mission-install] Error 2

Expected behavior
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Code snips
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System observed on:

• OS: compiling on Ubuntu 20.04
• Versions latest in main as of today

Additional context
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Reporter Info
Jose F Martinez Pedraza GSFC 582