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Top Forums Programming Parameter passing to function with void * as Argument Post 302902990 by Corona688 on Friday 23rd of May 2014 11:05:51 AM
Old 05-23-2014
Quote:
Originally Posted by rupeshkp728
I guess(may be I am wrong) the func call is incorrect.
Did you try the code or just consider it to look wrong...?
Quote:
We need to pass object of type S.
Why?

The whole point of using a union, and the whole point of adding type to the beginning of your CS and DS structures, was that they'd all have the same memory layout.

The compiler warns you since it doesn't know you built with these assumptions in mind. You can avoid the warning with a typecast if you want:

Code:
myfunc((S *)&obj);

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CONFIG.GUESS(1) 						   User Commands						   CONFIG.GUESS(1)

NAME
config.guess - guess the build system triplet SYNOPSIS
config.guess [OPTION] DESCRIPTION
The GNU build system distinguishes three types of machines, the `build' machine on which the compilers are run, the `host' machine on which the package being built will run, and, exclusively when you build a compiler, assembler etc., the `target' machine, for which the compiler being built will produce code. This script will guess the type of the `build' machine. Output the configuration name of the system `config.guess' is run on. Operation modes: -h, --help print this help, then exit -t, --time-stamp print date of last modification, then exit -v, --version print version number, then exit ENVIRONMENT VARIABLES
config.guess might need to compile and run C code, hence it needs a compiler for the `build' machine: use the environment variable `CC_FOR_BUILD' to specify the compiler for the build machine. If `CC_FOR_BUILD' is not specified, `CC' will be used. Be sure to specify `CC_FOR_BUILD' is `CC' is a cross-compiler to the `host' machine. CC_FOR_BUILD a native C compiler, defaults to `cc' CC a native C compiler, the previous variable is preferred REPORTING BUGS
Report bugs and patches to <config-patches@gnu.org>. Originally written by Per Bothner. Copyright 1992-2016 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU- LAR PURPOSE. SEE ALSO
autoconf(1), automake(1), autoreconf(1), autoupdate(1), autoheader(1), autoscan(1), config.guess(1), config.sub(1), ifnames(1), libtool(1). GNU Autoconf 2.69 August 2017 CONFIG.GUESS(1)
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