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X-Authentication-Warning:	slinky.cs.nyu.edu: pechtcha owned process doing -bs
Date:	Wed, 5 May 2004 12:07:37 -0400 (EDT)
From:	Igor Pechtchanski <pechtcha AT cs DOT nyu DOT edu>
Reply-To:	cygwin AT cygwin DOT com
To:	Ted Yu <ted_yu AT yahoo DOT com>
cc:	cygwin AT cygwin DOT com
Subject:	RE: DLL generation under Cygwin
In-Reply-To:	<20040505154908.91567.qmail@web12108.mail.yahoo.com>
Message-ID:	<Pine.GSO.4.56.0405051202310.1487@slinky.cs.nyu.edu>
References:	<20040505154908 DOT 91567 DOT qmail AT web12108 DOT mail DOT yahoo DOT com>
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On Wed, 5 May 2004, Ted Yu wrote:

> Hi,
> I deleted .o files and compiled with -mno-cygwin.
> cygwin1.dll is still needed because it contains
> malloc() and free() which are used in my DLL.

So does MSVCRT.dll, which is what MinGW uses for its runtime.

> Here is my Makefile:
> OBJS = \
>         8d0.o 8d1.o 8d2.o \
>         8c0.o 8c1.o 8c2.o \
>         8r0.o 8r1.o 8r2.o \
>         8u0.o 8u1.o 8u2.o \
>         8v0.o 8v1.o 8v2.o \
>         4d0.o 4d1.o 4d2.o \
>         4c0.o 4c1.o 4c2.o \
>         4r0.o 4r1.o 4r2.o \
>         4u0.o 4u1.o 4u2.o \
>         4v0.o 4v1.o 4v2.o \
>         8sc.o 8sr.o 8mc.o 8mr.o \
>         4sc.o 4sr.o 4mc.o 4mr.o \
>         fftfreq.o djbfft2d.o /lib/libc.a
                               ^^^^^^^^^^^
Why are you linking in libc.a explicitly?  The appropriate version should
be automatically linked in by the compiler.

> CFLAGS = -O1 -fomit-frame-pointer -malign-double -mno-cygwin
> djbfft.dll: $(OBJS)
>         $(LD) -s --base-file fft.base --dll -o $(DLLNAME) $(OBJS) $(LIBS) -e 'fftEntry AT 12'
                                                 ^^^^^^^^^^         ^^^^^^^
What's LIBS set to?  What's DLLNAME set to?

>         dlltool --as=$(AS) --dllname $(DLLNAME) --def fft.def --base-file fft.base --output-exp fft.exp
                       ^^^^^
What's AS set to?

>         $(LD) -s --base-file fft.base fft.exp -dll -o $(DLLNAME) $(OBJS) $(LIBS) -e 'fftEntry AT 12'
>         dlltool --as=$(AS) --dllname $(DLLNAME) --def fft.def --base-file fft.base --output-exp fft.exp
>         $(LD) fft.exp --dll -o $(DLLNAME) $(OBJS) $(LIBS) -e 'fftEntry AT 12'
>         dlltool --def fft.def --dllname $(DLLNAME) --output-lib fft.lib

It also looks like you're using the Cygwin version of "ld", and dlltool
will probably invoke the Cygwin versions of tools, too.  Try adding
-mno-cygwin to CC rather than CFLAGS, i.e.,

CC = gcc -mno-cygwin
CFLAGS = -O1 -fomit-frame-pointer -malign-double
...

and using $(CC) to link instead of $(LD) (you can pass flags to ld via
the -Wl,... options, IIRC).
	Igor
-- 
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