[CMake] set_property(SOURCE APPEND PROPERTY COMPILE_FLAGS) generates list output

[James Bigler]

I'm trying to append a bunch of extra compile flags to a list of source
files:

set_property(SOURCE foo.cpp main.cpp APPEND PROPERTY COMPILE_FLAGS -Wall)

set( ignore_warning_flags
        "-Wno-unused -Wno-switch -Wno-write-strings -Wno-strict-aliasing
-Wno-strict-prototypes -Wno-sign-compare" )

set_property( SOURCE ${sources}
               APPEND
               PROPERTY COMPILE_FLAGS "${ignore_warning_flags}"
               )

I tried that and making ignore_warning_flags a list and not quoting it in
set_property, but the compile line ends up having a semi-colon before my new
set of arguments:

-include cmdoptMessageDefs.h;-Wno-unused -Wno

I know there are issues with CMake treating some properties as strings and
others as lists, but it's rather unfortunate that I can't use APPEND.

Thanks,
James
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