Solved

about compile option -D

Posted on 2002-03-13
8
397 Views
Last Modified: 2013-12-06
Hello,

When using "cc" to compile a C program, -DXXXX can be specified as a compile option. Here, "XXXX" may be a macro defined by myself, or a macro defined by Solaris, such like "_LP64". Is there any way to know what macros Solaris provides? And how about such of HP-UX?
Thanks.

sincerely,
fancyqin
0
Comment
Question by:fancyqin
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
8 Comments
 
LVL 51

Expert Comment

by:ahoffmann
ID: 6864611
use cc -v  to display what the compiler sets by default

When you say "to know what macros Solaris provides?", I assume you want to know which macros are possible.
Short answer: there is no way.
Long answer: this is the wrong question, somehow.
Solaris does not "provide macros". The macros are used and defined in the source files. macros can be (nearly) any string.
To find out which are used by the OS (Solaris, HP-UX, etc.), do something like:
     find /usr/include -type f -name \*.h -exec grep define {} \;|sort -u
be prepared for a huge output.
0
 
LVL 40

Expert Comment

by:jlevie
ID: 6866094
Well that depends on what you are trying to find out and what compiler is being used. There are a set of system & compiler predefinitions for all operating systems. On a Solaris system with a Workshop or Forte C compiler those predefinitions are shown in 'man cc'. If Gnu C is installed you'd get it's predefinitions by:

> touch foo.h
> cpp -dM foo.h

So far as I know the trick with cpp will work on any OS that includes cpp.
0
 

Expert Comment

by:akohli
ID: 6882053
U can u man cc inorder to find the predefined MACROS available for the compiler in that particular platform
0
Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 

Author Comment

by:fancyqin
ID: 6887967
Hello,

Execute "man -M /opt/SUNWspro/man cc", got:
......
-Dname[=token]
   Associates name with the specified token  as  if  by  a
   #define  preprocessing  directive.   If  no  =token  is
   specified, the token 1 is supplied.
   Predefinitions:unix
               sparc (SPARC)
               i386 (Intel)
               sun

   The above are not predefined in -Xc mode.
   These predefinitions are valid in all modes:
            __sun
            __unix
            __SUNPRO_C=0x420
            __`uname -s`_`uname -r`
            __sparc (SPARC)
            __i386 (Intel)
            __BUILTIN_VA_ARG_INCR
            __SVR4
            __LITTLE ENDIAN (PowerPC)
            __ppc (PowerPC)
   The following is predefined in -Xa and -Xt modes only:
            __RESTRICT
   The compiler also predefines the object-like macro
            __PRAGMA_REDEFINE_EXTNAME,
   to indicate the pragma will be recognized.
......

Those above are all predefined MACROS?
0
 

Accepted Solution

by:
akohli earned 117 total points
ID: 6887994
I think Yes..But in order to test. DO small test on Your platfrom.Like


main()
{

#ifdef _sun
printf("SUN is already defined \n");

}

Compile it without any complier flag and check..
0
 
LVL 40

Expert Comment

by:jlevie
ID: 6888558
Yes, those are all of the publically defined values for Sun's compiler. There are, I believe, others that exist but they aren't intended for use by programs and may change from one compiler release to another. In general system pre-defined values will be prefixed with '__'. So if you are wanting to avoid a clash with a system definition don't use '__' as a prefix for a local definition.
0
 
LVL 21

Expert Comment

by:tfewster
ID: 7833240
No comment has been added lately, so it's time to clean up this Topic Area.
I will leave a recommendation for this question in the Cleanup topic area as follows:

- Answered by akohli

Please leave any comments here within the next 7 days

PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER !

tfewster (I don't work here, I'm just an Expert :-)
0
 

Expert Comment

by:modulo
ID: 7908981
Finalized as proposed

modulo

Community Support Moderator
Experts Exchange
0

Featured Post

Secure Your Active Directory - April 20, 2017

Active Directory plays a critical role in your company’s IT infrastructure and keeping it secure in today’s hacker-infested world is a must.
Microsoft published 300+ pages of guidance, but who has the time, money, and resources to implement? Register now to find an easier way.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Unix process listing into CSV format 3 53
unix solaris snoop command 6 122
mobaxterm not able to change directory 28 291
How can i set a Environment Variable in my Unix script ? 3 82
Introduction Regular patching is part of a system administrator's tasks. However, many patches require that the system be in single-user mode before they can be installed. A cluster patch in particular can take quite a while to apply if the machine…
Every server (virtual or physical) needs a console: and the console can be provided through hardware directly connected, software for remote connections, local connections, through a KVM, etc. This document explains the different types of consol…
Learn how to navigate the file tree with the shell. Use pwd to print the current working directory: Use ls to list a directory's contents: Use cd to change to a new directory: Use wildcards instead of typing out long directory names: Use ../ to move…
In a previous video, we went over how to export a DynamoDB table into Amazon S3.  In this video, we show how to load the export from S3 into a DynamoDB table.

726 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question