Where are the Predefined Macros defined?

Hello everyone, I notice that gcc has some predefined macros, which can be obtained with " gcc -dM -E - < /dev/null". I guess many of them are machine-specified, such as __LDBL_MANT_DIG__. However, I can't find where these macros are defined when browsing GCC's source codes. I'm very curious a

Re: Where are the Predefined Macros defined?

Cool, thanks! Andreas Schwab 于2018年9月29日周六 下午7:57写道： > > On Sep 29 2018, bx L wrote: > > > I notice that gcc has some predefined macros, which can be > > obtained with " gcc -dM -E - < /dev/null". I guess many of them are > > machine-specified, suc