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@kubo39

ヘッダ内で定義済みマクロ一覧を取得する方法

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cpp -dM を使います。

$ printf '#include <sys/stat.h>' | cpp -dM - | head -5
#define __S_IFBLK 0060000
#define S_ISCHR(mode) __S_ISTYPE((mode), __S_IFCHR)
#define __DBL_MIN_EXP__ (-1021)
#define __UINT_LEAST16_MAX__ 65535
#define __ATOMIC_ACQUIRE 2

マクロ定義を先につけるとプリプロセッサ実行時に適用されます。

$ printf '#include <sys/stat.h>' | cpp -dM - | wc -l
477
$ printf '#define _GNU_SOURCE\n#include <sys/stat.h>' | cpp -dM - | wc -l
495
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