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Date: Wed, 13 Oct 2010 17:15:45 +0200
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Subject: Finding the SONAME for bzip2
From: Al <oss DOT elmar AT googlemail DOT com>
To: cygwin AT cygwin DOT com
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Hello,

I want to adapt the Makefile of bzip2 for cygwin and I want to
understand enough of what I am doing.

This are the lines of interest from the Linux Makefile:

BIGFILES=3D-D_FILE_OFFSET_BITS=3D64
CFLAGS+=3D-fpic -fPIC -Wall -Winline $(BIGFILES)
SOEXT=3Dso
SONAME=3Dlibbz2.${SOEXT}.1
SOLDFLAGS=3D-shared -Wl,-soname -Wl,$(SONAME)

$(CC) $(LDFLAGS) $(SOLDFLAGS) -o libbz2.${SOEXT}.1.0.5 $(OBJS)
$(CC) $(LDFLAGS) $(CFLAGS) -o bzip2-shared bzip2.c libbz2.${SOEXT}.1.0.5


What would by the appropriate adaption for Cygwin?

I would try with this as a bare minimum, but then I loose all the versionin=
g:

CFLAGS+=3D-Wall
SONAME=3D
SOLDFLAGS=3D-shared

$(CC) $(LDFLAGS) $(SOLDFLAGS) -o cygbz2.dll $(OBJS)
$(CC) $(LDFLAGS) $(CFLAGS) -o bzip2-shared bzip2.c cygbz2.dll

Then the cygwin doc [1] suggests some other flags but no soname at all:

gcc -shared -o cyg${module}.dll \
    -Wl,--out-implib=3Dlib${module}.dll.a \
    -Wl,--export-all-symbols \
    -Wl,--enable-auto-import \
    -Wl,--whole-archive ${old_libs} \
    -Wl,--no-whole-archive ${dependency_libs}

Al

[1] http://www.cygwin.com/cygwin-ug-net/dll.html

--=20
Caution crosser: =A0Runnig Gentoo/Prefix on Cygwin/Vista.
All stupid questions are related to that context.

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