Date: Mon, 4 Mar 1996 12:19:29 -0700 From: Sean Kelly <kelly@fsl.noaa.gov> To: erich@lodgenet.com Cc: hackers@freebsd.org Subject: Re: C++ and wierd symbols Message-ID: <9603041919.AA00471@emu.fsl.noaa.gov> In-Reply-To: <199603041812.MAA09741@jake.lodgenet.com> (erich@lodgenet.com)
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>>>>> "Eric" == "Eric L Hernes" <erich@lodgenet.com> writes:
Eric> I'm trying to compile some c++ stuff and I'm getting wierd
Eric> link errors, like c++ is trying to overload some functions.
Eric> does anyone have a clue as what's wrong?
Yep. You need
extern "C" {
void pnm_readpnm(whatever, whatever, ...);
// Other functions declarations.
}
somewhere in editor.c. When you use C++, the symbols that are
generated include type information. This process is called name
mangling. Since pnm_readpnm() comes from a C, NOT a C++ file, then
the type information isn't included, which is why you get undefined
symbols. The extern "C" declaration above tells the C++ compiler to
not mangle the names of the given functions.
--
Sean Kelly
NOAA Forecast Systems Laboratory kelly@fsl.noaa.gov
Boulder Colorado USA http://www-sdd.fsl.noaa.gov/~kelly/
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