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From: hopper@ux.acs.umn.edu (hopper)
Newsgroups: comp.lang.c++,comp.sys.ibm.pc.misc,alt.msdos.programmer
Subject: Re: On Linking TC++ to Assembly Language
Message-ID: <2150@ux.acs.umn.edu>
Date: 28 Aug 90 21:28:01 GMT
References: <1990Aug20.143139.7100@ux1.cso.uiuc.edu> <90239.223422POPOVICH@ucf1vm.cc.ucf.edu>
Reply-To: hopper@ux.acs.umn.edu (Eric Hopper)
Followup-To: comp.lang.c++
Organization: Omnifarious Software
Lines: 45

In article <90239.223422POPOVICH@ucf1vm.cc.ucf.edu> POPOVICH@ucf1vm.cc.ucf.edu (Peter Edward Popovich) writes:
>
>Since you have TC++, I'll direct you to look at the header files. Note how
>they all have stuff (approxamately) like:
>
>#ifdef cplusplus
>struct c {
>#endif
>char *srtcpy(char *,char *);
>#ifdef cplusplus
>}
>#endif
>
	Thirty-five and 1/2 people have probably already said this, but it
really goes like this:

#ifdef _cpluplus
extern "C" {
#endif
char *strcpy(char *, const char *);
#ifdef _cplusplus
}
#endif

	The main difference is the 'extern "C" {' instead of 'struct c {'.
The extern "C" construct is a standard part of the C++ 2.0 AT&T spec. It
says that all prototypes in it's scope are linked as C functions, not C++
functions. You probably want to do this for any assembly routine you write
because different compilers use different name mangling schemes that are
generally hard to figure out for naming assembly functions.

Have fun,
UUCP: rutgers!umn-cs!ux.acs.umn.edu!hopper   (Eric Hopper)
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