include(CheckCSourceCompiles)
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macro(check_function_keywords _wordlist)
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set(${_result} "")
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foreach(flag ${_wordlist})
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string(REGEX REPLACE "[-+/ ()]" "_" flagname "${flag}")
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string(TOUPPER "${flagname}" flagname)
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set(have_flag "HAVE_${flagname}")
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check_c_source_compiles("${flag} void func(); void func() { } int main() { func(); return 0; }" ${have_flag})
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if(${have_flag} AND NOT ${_result})
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set(${_result} "${flag}")
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# break()
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endif(${have_flag} AND NOT ${_result})
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endforeach(flag)
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endmacro(check_function_keywords)
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