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gcc で pre-defined なマクロを調べるワンライナー

Posted at 2012-04-15

echo | gcc -dM -E -

下記のように，標準出力にズルズルと出てくる．

#define __DBL_MIN_EXP__ (-1021)
#define __FLT_MIN__ 1.17549435e-38F
#define __DEC64_DEN__ 0.000000000000001E-383DD
#define __CHAR_BIT__ 8
#define __WCHAR_MAX__ 2147483647
…

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