$ gcc --help=separate オプション文字列の後に別の単語として現れる引数を取るオプションを表示 The following options take separate arguments: --assert Same as -A. Use the latter option instead. --define-macro Same as -D. Use the latter option instead. --dump Same as -d. Use the latter option instead. --dumpbase Same as -dumpbase. Use the latter option instead. --dumpdir Same as -dumpdir. Use the latter option instead. --imacros Same as -imacros. Use the latter option instead. ︙ -iquote <dir> Add <dir> to the end of the quote include path. -isysroot <dir> Set <dir> to be the system root directory. -isystem <dir> Add <dir> to the start of the system include path. -iwithprefix <dir> Add <dir> to the end of the system include path. -iwithprefixbefore <dir> Add <dir> to the end of the main include path. -o <file> Place output into <file>. $