Endianness error in opam-full compilation in MSYS2/mingw-w64

[MisterDA]

Hi,

I’m trying to compile OCaml+Opam on Windows, in a MSYS2 environment, with host and target being mingw-w64 for x86_64.

I’m getting this error:

User@WinDev2001Eval MINGW64 ~/opam-full-2.0.6
$ mingw32-make.exe MAKE_VERBOSE=1 cold
env MAKE=C:/msys64/mingw64/bin/mingw32-make ./shell/bootstrap-ocaml.sh
Configuring OCaml version 4.07.1
Configuring for host x86_64-pc-mingw64 ...
Configuring for target x86_64-pc-mingw64 ...
Using compiler gcc.
Compiler family and version: gcc-9-2.
./configure: line 560: flexlink: command not found
[WARNING] flexlink not found: native shared libraries won't be available.
The C compiler is ISO C99 compliant.
Checking the sizes of integers and pointers...
Wow! A 64 bit architecture!
[ERROR!] This architecture seems to be neither big endian nor little endian.
 OCaml won't run on this architecture.
mingw32-make: *** [Makefile:190: compiler] Error 2

Any help would be appreciated. I guess I can bypass this check, but it would be better to have it fixed. The files involved are:

• opam-full-2.0.6/bootstrap/ocaml-4.07.1/configure
• opam-full-2.0.6/bootstrap/ocaml-4.07.1/config/auto-aux/runtest
• opam-full-2.0.6/bootstrap/ocaml-4.07.1/config/auto-aux/endian.c

Another question: can I seamlessly update the bundled OCaml version?

Thanks.

[rjbou]

It is a specific ocaml check problem. On 4.08.0, the ocaml team changed completely the configure check, you can try with the new one.
To update the bundled ocaml version, you need to update the ocaml url & hash in src_ext/Makefile.

[MisterDA]

I think I should follow the Windows instructions rather that following
the make cold approach.

To update the bundled ocaml version, you need to update the ocaml
url & hash in src_ext/Makefile.

$ OCAML_VERSION=4.09.0
$ sed -e "s|^URL_ocaml.*$|URL_ocaml = https://github.com/ocaml/ocaml/archive/${OCAML_VERSION}.tar.gz|" \
    -e 's|^MD5_ocaml.*$|MD5_ocaml = 76ac39570fc88b16fda2a94db7cd5cf3|' \
    -i src_ext/Makefile
$ sed -e 's|cd ${V}|cd ocaml-${V}|' -i shell/bootstrap-ocaml.sh
$ make compiler
env MAKE=make ./shell/bootstrap-ocaml.sh auto
./shell/bootstrap-ocaml.sh: line 114: config/Makefile: No such file or directory

The build process seems to be incompatible between 4.07 and 4.09, so
compiling 4.09 from Opam 2.0.6 does not seem possible.

[rjbou]

Any news on this one ?

[MisterDA]

No. I have abandoned this path, at that time I think I hadn't set up my build scripts to be fully reproductible, thus I sadly can not reproduce easily the bug, and I'm not going to work on this again. There has been a lot of changes in Opam lately, and some bugs may have been fixed. I rather suggest testing with (upcoming) OCaml 4.10.1 and Opam 2.1.0 on MSYS2 for bugs.

…

[dra27]

OCaml on MSYS2 is not technically supported either - closing this one for now, as no one's working on it.