[Bug driver/37820] need command line option that prints all defaults and predefined macros

[brian at dessent dot net]

------- Comment #1 from brian at dessent dot net  2008-10-14 04:33 -------
Subject: Re:   New: need command line option that prints all 
 defaults and predefined macros

http://gcc.gnu.org/onlinedocs/gcc/C-Dialect-Options.html#index-std-98

This is covered in the manual.  The default for C is gnu89 and the
default for C++ is gnu++98.  The --help output is not supposed to be a
substitute for proper documentation, it's just a brief summary.

To list predefined macros, use -dM with an empty input file, e.g. "gcc
-dM -E - </dev/null".


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37820