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X-Authentication-Warning:	slinky.cs.nyu.edu: pechtcha owned process doing -bs
Date:	Tue, 17 Feb 2004 11:17:13 -0500 (EST)
From:	Igor Pechtchanski <pechtcha AT cs DOT nyu DOT edu>
Reply-To:	cygwin AT cygwin DOT com
To:	Mishel <bymi AT pactcorp DOT com>
cc:	cygwin AT cygwin DOT com
Subject:	Re: How to print out from DLL
In-Reply-To:	<loom.20040217T112640-640@post.gmane.org>
Message-ID:	<Pine.GSO.4.56.0402171112440.28780@slinky.cs.nyu.edu>
References:	<loom DOT 20040217T112640-640 AT post DOT gmane DOT org>
MIME-Version:	1.0
X-Scanned-By:	MIMEDefang 2.39

On Tue, 17 Feb 2004, Mishel wrote:

> Hi,
>
> I have a problem with printing to the standart output from DLL.
> 1. I create simple DLL(aaaDll.dll) in the MVS 6.0. This DLL has only one
> function(fnAaaDll()), which prints some strings.
> 2. I create another console application project(aaaTestDll.cpp) in MVS 6.0
> which has only main function. In this function I call function from DLL(befor a
> link the interface library for DLL). In this case I have all printings in the
> console!
> 3. I cleate the interface library for this DLL in the Cygwin:
>
> cd ./Release
> echo EXPORTS > aaaDll.def
> echo fnAaaDll >> aaaDll.def
> dlltool --def aaaDll.def --dllname aaaDll.dll --output-lib libAaa.a
> cp libAaa.a /usr/local/lib/libAaa.a
> cd ..
>
> and I compile my test programm in the Cygwin(see makefile):
>
> AAALDPATH = -L/usr/local/lib
> CC              = g++ -pipe -Wno-deprecated
> LN              = g++ -static
> LIBS    = -lAaa
> LDPATH  = $(AAALDPATH)
>
> WARN    = -Wall -Wbad-function-cast -Wcast-qual \
>           -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes \
>           # -Wcast-align -Wredundant-decls -Winline
>
> CFLAGS  = $(WARN)
>
> APPNAME = aaa
> APPOBJS =       aaaTestDll.o
>
> $(APPNAME)      :$(APPOBJS)
>         $(LN) -o $@ $(APPOBJS) $(LDPATH) $(LIBS)
>         strip $@.exe
> %.o: %.c
>         $(CC) -c -g -Wall $(DEF) $(INCL) $< -o $@
>
> clean:
>         rm -f *.o
>         rm -f .depend
>         rm -f $(APPNAME).exe
>         make -f makefile .depend
>
> .depend:
>         $(CC) $(DEF) $(INCL) -E -M -MG $(shell ls *.c*) > .depend
>
> include .depend
>
>
> I run result and no printings on the console!
> Question: How I can print from the DLL under Cygwin?
>
> Best regards,
> Mishel.

Cygwin programs use their own C runtime, which conflicts with msvcrt.dll
used by Microsoft tools.  In short: without really nasty contortions, I
doubt you'd be able to print from both a Cygwin program and a DLL compiled
outside of Cygwin.  Either compile all your DLLs under Cygwin as well, or
use the "-mno-cygwin" flag (which invokes the MinGW version of gcc).  Note
that in the latter case, you will not get the full POSIX emulation that
Cygwin provides, and your program will be a pure Windows program.
	Igor
-- 
				http://cs.nyu.edu/~pechtcha/
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     |,4-  ) )-,_. ,\ (  `'-'		Igor Pechtchanski, Ph.D.
    '---''(_/--'  `-'\_) fL	a.k.a JaguaR-R-R-r-r-r-.-.-.  Meow!

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to the bathroom is a major career booster."  -- Patrick Naughton

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