--- Mer 13/10/10, Al ha scritto:
> Hello,
>
> 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
>
> This are the lines of interest from the Linux Makefile:
>
> BIGFILES=-D_FILE_OFFSET_BITS=64
> CFLAGS+=-fpic -fPIC -Wall -Winline $(BIGFILES)
> SOEXT=so
> SONAME=libbz2.${SOEXT}.1
> SOLDFLAGS=-shared -Wl,-soname -Wl,$(SONAME)
>
> $(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
>
>
> What would by the appropriate adaption for Cygwin?
>
> I would try with this as a bare minimum, but then I loose
> all the versioning:
>
> CFLAGS+=-Wall
> SONAME=
> SOLDFLAGS=-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=lib${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
>
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