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From: Hans-Bernhard Broeker <broeker AT physik DOT rwth-aachen DOT de>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Undefined reference to __alloca
Date: 13 May 2004 11:22:43 GMT
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davin-libsdl4893 AT mailblocks DOT com wrote:
> I get the following linker error
> when I run make game.exe:

> cd d:/research/2004/djgpp-game/
> make game.exe
> c:/djgpp/bin/gpp.exe game.o -o .exe -lstdcxx -lm

That line shows several actual or potential problems:

1) you should not have to call gpp.exe by an absolute path.  
2) since you're using gpp.exe, there's no need to -lstdcxx
3) the output file name ".exe" is certainly not what you want it to be.

> game.o(.text+0x3b):game.cc: undefined reference to `__alloca'

Please compile with debug info turned on ("-g" flag).  That'll resolve
the error message to a function and line number.

And in case you're not doing that yet (and your Makefile shows no sign
of it): turn on optimization.  GCC at least historically had some
problems when you compiled C++ code with no optimization at all.

> Here is my Makefile:

> BIN=c:/djgpp/bin

> %.run: %.exe
> /$*.exe

I'll assume there's a <Tab> and a "." before the "/" in that line in
your actual file?  (Hint: leading "." will get eaten by mail systems).

> game.exe: game.o
> $(BIN)/gpp.exe $^ -o $*.exe

(Again, something ate the <Tab>)

And no rule at all how to produce game.o?  Are you sure it's compiled
from your 'game.cc'?  By *this* version of GCC?

-- 
Hans-Bernhard Broeker (broeker AT physik DOT rwth-aachen DOT de)
Even if all the snow were burnt, ashes would remain.