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$ help cc /standard

CC

  /STANDARD

        /STANDARD=(option)
        /STANDARD=RELAXED (equivalent to /NOSTANDARD) (D)
        /NOSTANDARD (D)

     Defines the compilation mode.  You can select the following
     options:

     ANSI89            Places the compiler in strict ANSI C Standard 89
                       (C89) mode.  This mode compiles the C language as
                       defined by the American National Standard for C,
                       along with any extensions not prohibited by that
                       standard.

     C99               On OpenVMS Alpha and I64 systems, places the
                       compiler in strict ISO/IEC C Standard 99 (C99)
                       mode.  This mode accepts just the C99 language
                       without extensions, and diagnoses violations of
                       the C99 standard.  /STANDARD=C99 defines the
                       __STDC_VERSION__ macro to the C99-specified value
                       of 199901L, because C99 is a superset of
                       Amendment 1 to the C89 standard, and the default
                       mode of RELAXED is a superset of C99.

                       On OpenVMS VAX systems, produces a warning and
                       places the compiler in /STANDARD=RELAXED ANSI89
                       mode.

     LATEST            On OpenVMS Alpha and I64 systems, places the
                       compiler in the latest ISO C standard dialect.
                       /STANDARD=LATEST is currently equivalent to
                       /STANDARD=C99, but is subject to change when
                       newer versions of the ISO C standard are
                       released.

     RELAXED           Places the compiler in relaxed ANSI C Standard
                       mode.  The compiler accepts ANSI/ISO C Standard
                       C89 and C99 features, as well as nearly all
                       language extensions (such as additional VSI C
                       keywords and predefined macros that do not begin
                       with an underscore).  It excludes only K&R
                       (COMMON mode), VAX C, and Microsoft features that
                       conflict with standard C.

                       This is the default mode of the compiler, and is
                       equivalent to /NOSTANDARD.

     MS                Places the compiler in Microsoft compatibility
                       mode, which interprets source programs according
                       to certain language rules followed by the C
                       compiler provided with the Microsoft Visual C++
                       compiler product.

     ISOC94            Places the compiler in ISO C 94 mode, which
                       enables digraph processing.  It also defines the
                       predefined macro __STDC_VERSION__=199409 when
                       specified alone or in combination with the
                       ANSI89, MIA, RELAXED, MS, COMMON, or PORTABLE
                       keywords.

                       This option can be specified alone or with any
                       other /STANDARD option except VAXC.  If it is
                       specified alone, the default major mode is
                       RELAXED.

     COMMON            Places the compiler in K & R language mode; that
                       is, compatibility with older UNIX compilers such
                       as pcc and gcc.  This mode is close to a subset
                       of /STANDARD=VAXC mode.

     VAXC              Places the compiler in VAX C mode.  There are
                       differences in the C language as implemented in
                       previous versions of VAX C and the C language as
                       defined by ANSI (the differences are primarily
                       concerned with how the preprocessor works).  This
                       mode provides compatibility for programs that
                       depend on old VAX C behavior.

     PORTABLE          Places the compiler in RELAXED mode, and enables
                       the issuance of diagnostics that warn of any
                       nonportable usages encountered.

                       Note that /STANDARD=PORTABLE is supported for
                       VAX C compatibility only.  It is equivalent to
                       the recommended combination of qualifiers
                       /STANDARD=RELAXED /WARNINGS=ENABLE=PORTABLE.

     MIA               Places the compiler in strict ANSI C mode with
                       the following behavior differences to conform to
                       the Multivendor Integration Architecture (MIA)
                       standard:

                       o  On OpenVMS VAX systems, G_FLOAT becomes the
                          default floating-point format for double
                          variables.  (On OpenVMS Alpha systems, G_FLOAT
                          is already the default.)

                       o  In structures, zero-length bit fields cause
                          the next bit field to start on an integer
                          boundary, rather than on a character boundary.


     If the /STANDARD qualifier is not specified, the default is
     /NOSTANDARD, which is equivalent to /STANDARD=RELAXED.

     If you specify the /STANDARD qualifier, you must supply an option.

     With one exception, the /STANDARD qualifier options are mutually
     exclusive.  Do not combine them.  The exception is that you can
     specify /STANDARD=ISOC94 with any other option except VAXC.

     VSI C modules compiled in different modes can be linked and
     executed together.


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