[CMake] Why does build_command() return a command that ignores errors?

[J Decker]

build_command( BUILD_COMMAND CONFIGURATION ${CMAKE_BUILD_TYPE} PROJECT_NAME
something TARGET install )

 results in 'make -i install'  so if there are errors in compiling, it
installs anyway, obliterating the errors.


So Why is there an ignore error flag on BULD_COMMAND?
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