Is gcc compliant with the C++ standards Post: 302339399

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Top Forums Programming Is gcc compliant with the C++ standards Post 302339399 by Corona688 on Thursday 30th of July 2009 11:30:54 AM

07-30-2009

Registered User

Quote:

Originally Posted by hthapar

Hello Friends,

I am a newbie and have started using different compilers and tools to make myself familiar with their workings. I wanted to know that how compliant is gcc with the C++ standards. It is pretty obvious that no compiler is close to being completely compliant, but if there are some things which are not according to the ANSI/ISO standard; what are they in gcc?

I will be very grateful if someone who is an expert user of gcc can answer this doubt of mine?

Regards.

gcc can be told comply with standards, lots of them. Pick your favorite:

Code:

$ man gcc

GCC(1)                                GNU                               GCC(1)



NAME
       gcc - GNU project C and C++ compiler

SYNOPSIS
       gcc [-c|-S|-E] [-std=standard]
           [-g] [-pg] [-Olevel]
           [-Wwarn...] [-pedantic]
           [-Idir...] [-Ldir...]
           [-Dmacro[=defn]...] [-Umacro]
           [-foption...] [-mmachine-option...]
           [-o outfile] infile...

       Only the most useful options are listed here; see below for the remain-
       der.  g++ accepts mostly the same options as gcc.

...

       -std=
           Determine the language standard.  This option is currently only
           supported when compiling C or C++.  A value for this option must be
           provided; possible values are

           c89
           iso9899:1990
               ISO C90 (same as -ansi).

           iso9899:199409
               ISO C90 as modified in amendment 1.

           c99
           c9x
           iso9899:1999
           iso9899:199x
               ISO C99.  Note that this standard is not yet fully supported;
               see <http://gcc.gnu.org/gcc-4.1/c99status.html> for more infor-
               mation.  The names c9x and iso9899:199x are deprecated.

           gnu89
               Default, ISO C90 plus GNU extensions (including some C99 fea-
               tures).

           gnu99
           gnu9x
               ISO C99 plus GNU extensions.  When ISO C99 is fully implemented
               in GCC, this will become the default.  The name gnu9x is depre-
               cated.

           c++98
               The 1998 ISO C++ standard plus amendments.

           gnu++98
               The same as -std=c++98 plus GNU extensions.  This is the
               default for C++ code.

           Even when this option is not specified, you can still use some of
           the features of newer standards in so far as they do not conflict
           with previous C standards.  For example, you may use "__restrict__"
           even when -std=c99 is not specified.

           The -std options specifying some version of ISO C have the same
           effects as -ansi, except that features that were not in ISO C90 but
           are in the specified version (for example, // comments and the
           "inline" keyword in ISO C99) are not disabled.

gcc also has lots of language extensions, but you don't need to use them.

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LEARN ABOUT NETBSD

genassym.cf

GENASSYM.CF(5)						      BSD File Formats Manual						    GENASSYM.CF(5)

NAME

     genassym.cf -- assym.h definition file

DESCRIPTION

     The genassym.cf file is used by genassym(1) to make constant C expressions known to assembler source files.  Lines starting with '#' are dis-
     carded by genassym(1).  Lines starting with include, ifdef, if, else or endif are preceded with '#' and passed otherwise unmodified to the C
     compiler.	Lines starting with quote get passed on with the quote command removed.  The first word after a define command is taken as a CPP
     identifier and the rest of the line has to be a constant C expression. The output of genassym(1) will assign the numerical value of this
     expression to the CPP identifier.	export X is a shorthand for define X X.  struct X remembers X for the member command and does a define
     X_SIZEOF sizeof(X).  member X does a define X offsetof(<last struct>, X).	config <ctype> <gcc constraint> <asm print modifier> can be used
     to customize the output of genassym(1).  When producing C output, values are casted to <ctype> (default: long) before they get handed to
     printf. <gcc constraint> (default: n) is the constraint used in the __asm__ statements. <asm print modifier> (default: empty) can be used to
     force gcc to output operands in different ways then normal. The "a" modifier e.g. stops gcc from emitting immediate prefixes in front of con-
     stants for the i386 and m68k port.

FILES

     /usr/src/sys/arch/${MACHINE}/${MACHINE}/genassym.cf

SEE ALSO

     genassym(1)

HISTORY

     The genassym.cf file appeared in NetBSD 1.3.

BSD
								  August 18, 2005							       BSD