/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 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.
LATEST 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 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.