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Date:	Wed, 13 Oct 2010 16:49:46 +0100 (BST)
From:	Marco Atzeri <marco_atzeri AT yahoo DOT it>
Subject:	R: Finding the SONAME for bzip2
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--- Mer 13/10/10, Al  ha scritto:

> Hello,
>=20
> I want to adapt the Makefile of bzip2 for cygwin and I want
> to
> understand enough of what I am doing.

have you checked the bzip2 source package for cygwin ?
I presume the mantainer already solved it

>=20
> This are the lines of interest from the Linux Makefile:
>=20
> 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)
>=20
> $(CC) $(LDFLAGS) $(SOLDFLAGS) -o libbz2.${SOEXT}.1.0.5
> $(OBJS)

usually we should have
             -o cygbz2-1.dll

(as you can see on libbz2_1 package)

as the version is before the .dll
due to some windows limitations ;-)

> $(CC) $(LDFLAGS) $(CFLAGS) -o bzip2-shared bzip2.c
> libbz2.${SOEXT}.1.0.5
>=20
>=20
> What would by the appropriate adaption for Cygwin?
>=20
> I would try with this as a bare minimum, but then I loose
> all the versioning:
>=20
> CFLAGS+=3D-Wall
> SONAME=3D
> SOLDFLAGS=3D-shared
>=20
> $(CC) $(LDFLAGS) $(SOLDFLAGS) -o cygbz2.dll $(OBJS)
> $(CC) $(LDFLAGS) $(CFLAGS) -o bzip2-shared bzip2.c
> cygbz2.dll
>=20
> Then the cygwin doc [1] suggests some other flags but no
> soname at all:
>=20
> gcc -shared -o cyg${module}.dll \
> =A0 =A0 -Wl,--out-implib=3Dlib${module}.dll.a \
> =A0 =A0 -Wl,--export-all-symbols \
> =A0 =A0 -Wl,--enable-auto-import \
> =A0 =A0 -Wl,--whole-archive ${old_libs} \
> =A0 =A0 -Wl,--no-whole-archive ${dependency_libs}
>=20
> Al
>=20
> [1] http://www.cygwin.com/cygwin-ug-net/dll.html
>=20






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