How to find my current compiler's standard, like if it is C90, etc

c compiler-construction c99 c89
Hemanth picture Hemanth · Feb 14, 2011 · Viewed 31.2k times · Source

I'm working on a Linux machine. Is there any system command to find the standard followed by the C compiler I'm using?

Answer

Tarantula picture Tarantula · Feb 14, 2011

This is compiler dependent, I'm supposing you're using GCC. You could check your compiler defined macros using:

gcc -dM -E - < /dev/null

Check the manual about the flags, specially:

__STDC_VERSION__

This macro expands to the C Standard's version number, a long integer constant of the form yyyymmL where yyyy and mm are the year and month of the Standard version. This signifies which version of the C Standard the compiler conforms to. Like STDC, this is not necessarily accurate for the entire implementation, unless GNU CPP is being used with GCC.

The value 199409L signifies the 1989 C standard as amended in 1994, which is the current default; the value 199901L signifies the 1999 revision of the C standard. Support for the 1999 revision is not yet complete.

This macro is not defined if the -traditional-cpp option is used, nor when compiling C++ or Objective-C.

In this site you can find a lot of information about this. See the table present here.

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