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function(_c4_intersperse_with_flag outvar flag)
if(MSVC AND "${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC") # it may be clang as well
set(f "/${flag}")
else()
set(f "-${flag}")
endif()
set(out)
foreach(i ${ARGN})
if(NOT "${i}" STREQUAL "")
set(out "${out} ${f} '${i}'")
# ... Following this are several unsuccessful attempts to make
# sure that an empty generator expression passed as part of the
# arguments won't be expanded to nothing between successive
# flags. For example, -I /some/include -I -I /other/include,
# which is wrong as it misses an empty quote. This causes
# clang-tidy in particular to fail. Maybe this is happening
# because the result is passed to separate_arguments() which
# prevents the lists from being evaluated correctly. Also, note
# that add_custom_target() has the following options which may
# help: COMMAND_EXPAND_LISTS and VERBATIM.
# Anyway -- for now it is working, but maybe the generator
# expression approach turns out to work while being much cleaner
# than the current approach.
#set(c $<GENEX_EVAL,$<BOOL:${i}>>)
#set(c $<BOOL:${i}>) # i may be a generator expression the evaluates to empty
#set(s "${f} ${i}")
#set(e "${f} aaaaaaWTF")
#list(APPEND out $<IF:${c},${s},${e}>)
#list(APPEND out $<${c},${s}>)
#list(APPEND out $<GENEX_EVAL:${c},${s}>)
#list(APPEND out $<TARGET_GENEX_EVAL:${tgt},${c},${s}>)
endif()
endforeach()
## https://cmake.org/cmake/help/latest/manual/cmake-generator-expressions.7.html#string-valued-generator-expressions
#if(ARGN)
# set(out "${f}$<JOIN:${ARGN},;${f}>")
#endif()
set(${outvar} ${out} PARENT_SCOPE)
endfunction()
function(c4_get_define_flags outvar)
_c4_intersperse_with_flag(out D ${ARGN})
set(${outvar} ${out} PARENT_SCOPE)
endfunction()
function(c4_get_include_flags outvar)
_c4_intersperse_with_flag(out I ${ARGN})
set(${outvar} ${out} PARENT_SCOPE)
endfunction()
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