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# add compile options to warning_options to ensure unused-function throws a warning
# if warning_options is NOT DEFINED, assume compiler doesn't support warning as error
macro(get_warning_options warning_options lang)
if (CMAKE_${lang}_COMPILER_ID MATCHES "^(GNU|Clang|AppleClang|XLClang|IBMClang|LCC|IntelLLVM)$")
set(${warning_options} "-Wall")
elseif (CMAKE_${lang}_COMPILER_ID STREQUAL "MSVC"
OR (CMAKE_${lang}_COMPILER_ID STREQUAL "Intel" AND CMAKE_${lang}_SIMULATE_ID MATCHES "MSVC"))
set(${warning_options} "-W4")
elseif (CMAKE_${lang}_COMPILER_ID STREQUAL "Intel")
set(${warning_options} "-w3")
elseif (CMAKE_${lang}_COMPILER_ID STREQUAL "XL")
set(${warning_options} "-qinfo=all")
elseif (CMAKE_${lang}_COMPILER_ID STREQUAL "SunPro")
if(lang STREQUAL CXX)
set(${warning_options} "+w;+w2")
else()
set(${warning_options} "")
endif()
elseif (CMAKE_${lang}_COMPILER_ID STREQUAL "Fujitsu")
set(${warning_options} "SHELL:-w 8")
endif()
endmacro()
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