make use of the cygwin packages instead of custom binaries

[andyli]

Hi,

I'm packaging opam for cygwin, and I believe it will be accepted into the cygwin repo soon. It works nicely with the ocaml cygwin package, but not so much with https://github.com/fdopen/opam-repository-mingw.

I ran the commands as follow:

$ opam repo add mingw 'https://github.com/fdopen/opam-repository-mingw.git'
[mingw] https://github.com/fdopen/opam-repository-mingw.git updated

$ opam switch 4.03.0+mingw32

=-=- Installing compiler 4.03.0+mingw32 -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
[mingw.comp] http://caml.inria.fr/pub/distrib/ocaml-4.03/ocaml-4.03.0.tar.xz downloaded
Now compiling OCaml. This may take a while, please bear with us...
[ERROR] Compiler build failed at "make -f Makefile.nt world.opt":
        # opam-version 1.2.2
        # os           cygwin
        # command      make -f Makefile.nt world.opt
        # path         /home/andy/.opam/4.03.0+mingw32/build/ocaml
        # exit-code    2
        # env-file     /home/andy/.opam/log/log-265380-335865.env
        # stdout-file  /home/andy/.opam/log/log-265380-335865.out
        # stderr-file  /home/andy/.opam/log/log-265380-335865.err
        ### stdout ###
        # [...]
        # boot/ocamlrun ./ocamlopt -g -nostdlib -I stdlib -I otherlibs/dynlink -strict-sequence -principal -w
        +33..39+48+50 -warn-error A -bin-annot -safe-string -strict-formats -I utils -I parsing -I typing -I bytecomp
        -I middle_end -I middle_end/base_types -I asmcomp -I driver -I toplevel -c bytecomp/bytelink.ml
        # boot/ocamlrun ./ocamlopt -g -nostdlib -I stdlib -I otherlibs/dynlink -strict-sequence -principal -w
        +33..39+48+50 -warn-error A -bin-annot -safe-string -strict-formats -I utils -I parsing -I typing -I bytecomp
        -I middle_end -I middle_end/base_types -I asmcomp -I driver -I toplevel -c bytecomp/bytelibrarian.ml
        # boot/ocamlrun ./ocamlopt -g -nostdlib -I stdlib -I otherlibs/dynlink -strict-sequence -principal -w
        +33..39+48+50 -warn-error A -bin-annot -safe-string -strict-formats -I utils -I parsing -I typing -I bytecomp
        -I middle_end -I middle_end/base_types -I asmcomp -I driver -I toplevel -c bytecomp/bytepackager.ml
        # boot/ocamlrun ./ocamlopt -g -nostdlib -I stdlib -I otherlibs/dynlink -strict-sequence -principal -w
        +33..39+48+50 -warn-error A -bin-annot -safe-string -strict-formats -I utils -I parsing -I typing -I bytecomp
        -I middle_end -I middle_end/base_types -I asmcomp -I driver -I toplevel -c driver/errors.ml
        # boot/ocamlrun ./ocamlopt -g -nostdlib -I stdlib -I otherlibs/dynlink -strict-sequence -principal -w
        +33..39+48+50 -warn-error A -bin-annot -safe-string -strict-formats -I utils -I parsing -I typing -I bytecomp
        -I middle_end -I middle_end/base_types -I asmcomp -I driver -I toplevel -c driver/compile.ml
        # boot/ocamlrun ./ocamlopt -g -nostdlib -I stdlib -I otherlibs/dynlink -a -o compilerlibs/ocamlbytecomp.cmxa
        bytecomp/meta.cmx bytecomp/instruct.cmx bytecomp/bytegen.cmx bytecomp/printinstr.cmx bytecomp/opcodes.cmx
        bytecomp/emitcode.cmx bytecomp/bytesections.cmx bytecomp/dll.cmx bytecomp/symtable.cmx bytecomp/bytelink.cmx
        bytecomp/bytelibrarian.cmx bytecomp/bytepackager.cmx driver/errors.cmx driver/compile.cmx
        # boot/ocamlrun ./ocamlopt -g -nostdlib -I stdlib -I otherlibs/dynlink -strict-sequence -principal -w
        +33..39+48+50 -warn-error A -bin-annot -safe-string -strict-formats -I utils -I parsing -I typing -I bytecomp
        -I middle_end -I middle_end/base_types -I asmcomp -I driver -I toplevel -c driver/main.ml
        # boot/ocamlrun ./ocamlopt -g -nostdlib -I stdlib -I otherlibs/dynlink  -ccopt "" -o ocamlc.opt \
        #           compilerlibs/ocamlcommon.cmxa compilerlibs/ocamlbytecomp.cmxa \
        #           driver/main.cmx -cclib "-lws2_32"
        ### stderr ###
        # 'flexlink' is not recognized as an internal or external command,
        # operable program or batch file.
        # File "caml_startup", line 1:
        # Error: Error during linking
        # make: *** [Makefile.nt:444: ocamlc.opt] Error 2

It might be due to flexdll is installed in a layout that the ocaml makefile didn't expect.

If I cp /usr/lib/flexdll/* /usr/bin/, I can go a bit further, but got another issue:

[ERROR] Compiler build failed at "make -f Makefile.nt world.opt":
        # opam-version 1.2.2
        # os           cygwin
        # command      make -f Makefile.nt world.opt
        # path         /home/andy/.opam/4.03.0+mingw32/build/ocaml
        # exit-code    2
        # env-file     /home/andy/.opam/log/log-271256-335865.env
        # stdout-file  /home/andy/.opam/log/log-271256-335865.out
        # stderr-file  /home/andy/.opam/log/log-271256-335865.err
        ### stdout ###
        # [...]
        # boot/ocamlrun ./ocamlopt -g -nostdlib -I stdlib -I otherlibs/dynlink -strict-sequence -principal -w
        +33..39+48+50 -warn-error A -bin-annot -safe-string -strict-formats -I utils -I parsing -I typing -I bytecomp
        -I middle_end -I middle_end/base_types -I asmcomp -I driver -I toplevel -c bytecomp/bytelink.ml
        # boot/ocamlrun ./ocamlopt -g -nostdlib -I stdlib -I otherlibs/dynlink -strict-sequence -principal -w
        +33..39+48+50 -warn-error A -bin-annot -safe-string -strict-formats -I utils -I parsing -I typing -I bytecomp
        -I middle_end -I middle_end/base_types -I asmcomp -I driver -I toplevel -c bytecomp/bytelibrarian.ml
        # boot/ocamlrun ./ocamlopt -g -nostdlib -I stdlib -I otherlibs/dynlink -strict-sequence -principal -w
        +33..39+48+50 -warn-error A -bin-annot -safe-string -strict-formats -I utils -I parsing -I typing -I bytecomp
        -I middle_end -I middle_end/base_types -I asmcomp -I driver -I toplevel -c bytecomp/bytepackager.ml
        # boot/ocamlrun ./ocamlopt -g -nostdlib -I stdlib -I otherlibs/dynlink -strict-sequence -principal -w
        +33..39+48+50 -warn-error A -bin-annot -safe-string -strict-formats -I utils -I parsing -I typing -I bytecomp
        -I middle_end -I middle_end/base_types -I asmcomp -I driver -I toplevel -c driver/errors.ml
        # boot/ocamlrun ./ocamlopt -g -nostdlib -I stdlib -I otherlibs/dynlink -strict-sequence -principal -w
        +33..39+48+50 -warn-error A -bin-annot -safe-string -strict-formats -I utils -I parsing -I typing -I bytecomp
        -I middle_end -I middle_end/base_types -I asmcomp -I driver -I toplevel -c driver/compile.ml
        # boot/ocamlrun ./ocamlopt -g -nostdlib -I stdlib -I otherlibs/dynlink -a -o compilerlibs/ocamlbytecomp.cmxa
        bytecomp/meta.cmx bytecomp/instruct.cmx bytecomp/bytegen.cmx bytecomp/printinstr.cmx bytecomp/opcodes.cmx
        bytecomp/emitcode.cmx bytecomp/bytesections.cmx bytecomp/dll.cmx bytecomp/symtable.cmx bytecomp/bytelink.cmx
        bytecomp/bytelibrarian.cmx bytecomp/bytepackager.cmx driver/errors.cmx driver/compile.cmx
        # boot/ocamlrun ./ocamlopt -g -nostdlib -I stdlib -I otherlibs/dynlink -strict-sequence -principal -w
        +33..39+48+50 -warn-error A -bin-annot -safe-string -strict-formats -I utils -I parsing -I typing -I bytecomp
        -I middle_end -I middle_end/base_types -I asmcomp -I driver -I toplevel -c driver/main.ml
        # boot/ocamlrun ./ocamlopt -g -nostdlib -I stdlib -I otherlibs/dynlink  -ccopt "" -o ocamlc.opt \
        #           compilerlibs/ocamlcommon.cmxa compilerlibs/ocamlbytecomp.cmxa \
        #           driver/main.cmx -cclib "-lws2_32"
        ### stderr ###
        # Access is denied.
        # File "caml_startup", line 1:
        # Error: Error during linking
        # make: *** [Makefile.nt:444: ocamlc.opt] Error 2

It would be great if the repo can be patched to work with the cygwin packages out of the box.
If the opam.exe is patched in some way, I will see if it is possible to include the patch in the cygwin package.

[fdopen]

Sorry, I don't think it would be worth the effort. There are too many problems, if you intend to use a opam.exe that is linked against cygwin1.dll with this repo:

• opam will use path expressions like /home/user/.opam/switch/bin that are only understood by cygwin, not native windows applications.

• "os" will be "cygwin", so all windows specific patches won't be applied:

patches: [
  "patch-zarith-1.4" { os = "win32" }
  "patch-configure"  { os = "win32" }
]

[andyli]

Ummm, so the opam.exe used in this repo is compiled with mingw? How did you build that? Was that building a mingw ocaml compiler first and use that to compile opam?

[fdopen]

Yes,
it was build with the mingw port of OCaml and the original bootstrapping was annoying because of the long dependency chain. (The patches for opam are available here: https://bitbucket.org/fdopen/ But they are not longer maintained. dra27 will hopefully be able to produce something usable for opam 2.0 and later)