Date: Thu, 4 Nov 1999 09:14:02 +0200 (IST)
From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
X-Sender: eliz AT is
To: =?big5?B?rdu6+y+kcKjfpGw=?= <lwku AT nlg2 DOT csie DOT ntu DOT edu DOT tw>
cc: djgpp AT delorie DOT com
Subject: Re: Linking problem
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On Wed, 3 Nov 1999, =?big5?B?rdu6+y+kcKjfpGw=?= wrote:

Please don't post in HTML.

> I have a problem in linking. I use gcc -c *.c *.cc to compile my source =
> code(one c file, and other c++ files).
>  Then I use gxx -o test.exe *.o to link. There is a linking error:
> 
>     TDT3_I_10.o(.text+0x1195):TDT3_I_10.cc: undefined reference to =
> 'mytag(FILE*,FILE*)'
> 
> mytag(FILE*,FILE*)is in mytagf.c

C functions called from C++ programs need to be declared as ``extern "C"''
in the prototypes visible to the C++ compiler that compiles C++ code which
calls those C functions.

See the DJGPP system headers for how this is done.

This is explained in section 8.10 of the FAQ, btw.