Cannot build on windows (Lwt 2.4.5)

[braibant]

Here is the log according to opam (but I also get this error if I compile "by hand").

===== ERROR while installing lwt.2.4.5 =====
# opam-version 1.1.2 (007c9356a3129fced7c3d7016216839013dbfb90)
# os           cygwin
# command      make build
# path         /home/vagrant/.opam/system/build/lwt.2.4.5
# compiler     system (4.01.0)
# exit-code    2
# env-file     /home/vagrant/.opam/system/build/lwt.2.4.5/lwt-1788-ffb3fd.env
# stdout-file  /home/vagrant/.opam/system/build/lwt.2.4.5/lwt-1788-ffb3fd.out
# stderr-file  /home/vagrant/.opam/system/build/lwt.2.4.5/lwt-1788-ffb3fd.err
### stdout ###
# ...[truncated]
#             ^
# src/unix/lwt_unix_stubs.c:1136:3: warning: implicit declaration of function ‘sigaltstack’ [-Wimplicit-function-declaration]
#    sigaltstack(&new_stack, &old_stack);
#    ^
# src/unix/lwt_unix_stubs.c:1142:21: error: ‘SA_ONSTACK’ undeclared (first use in this function)
#    new_sa.sa_flags = SA_ONSTACK;
#                      ^
# src/unix/lwt_unix_stubs.c:1142:21: note: each undeclared identifier is reported only once for each function it appears in
# Command exited with code 2.
# Makefile:27: recipe for target 'build' failed
### stderr ###
# ocamlfind: Package `wikidoc' not found
# E: Failure("Command ''/usr/bin/ocamlbuild' syntax/optcomp.cma syntax/optcomp.cmxa syntax/optcomp.a src/core/lwt.cma src/core/lwt.cmxa src/core/lwt.a src/logger/lwt-log.cma src/logger/lwt-log.cmxa src/logger/lwt-log.a src/unix/liblwt-unix_stubs.a src/unix/dlllwt-unix_stubs.so src/unix/lwt-unix.cma src/unix/lwt-unix.cmxa src/unix/lwt-unix.a src/simple_top/lwt-simple-top.cma src/simple_top/lwt-simple...[truncated]
# make: *** [build] Error 1

'opam install lwt' failed.

[braibant]

In the end, I compiled it using WODI. There is another way to compile Lwt by hand, which involve modifying the first line of setup.data to give a correct path to ocamlfind.

[avsm]

It looks like WODI has a number of patches that haven't been submitted here. Looks like os_type is Cygwin instead of Win32 as the discover.ml expects.

[msprotz]

I'm getting a different error here (not enough quoting).

bash: C:cygwinhomeprotz.opamsystembinocamlfind.EXE: command not found

E: Failure("Command 'C:\\OCaml\\bin\\ocamlbuild.EXE -classic-display -no-log -no-links -install-lib-dir C:\\OCaml\\lib\\ocamlbuild -byte-plugin syntax/optcomp.cma syntax/optcomp.cmxa syntax/optcomp.a syntax/optcomp.cmxs src/core/lwt.cma src/core/lwt.cmxa src/core/lwt.a src/core/lwt.cmxs src/logger/lwt-log.cma src/logger/lwt-log.cmxa src/logger/lwt-log.a src/logger/lwt-log.cmxs src/unix/liblwt-unix_stubs.a src/unix/dlllwt-unix_stubs.dll src/unix/lwt-unix.cma src/unix/lwt-unix.cmxa src/unix/lwt-unix.a src/unix/lwt-unix.cmxs src/simple_top/lwt-simple-top.cma src/simple_top/lwt-simple-top.cmxa src/simple_top/lwt-simple-top.a src/simple_top/lwt-simple-top.cmxs src/react/lwt-react.cma src/react/lwt-react.cmxa src/react/lwt-react.a src/react/lwt-react.cmxs src/preemptive/lwt-preemptive.cma src/preemptive/lwt-preemptive.cmxa src/preemptive/lwt-preemptive.a src/preemptive/lwt-preemptive.cmxs src/extra/lwt-extra.cma src/extra/lwt-extra.cmxa src/extra/lwt-extra.a src/extra/lwt-extra.cmxs syntax/lwt-syntax.cma syntax/lwt-syntax.cmxa syntax/lwt-syntax.a syntax/lwt-syntax.cmxs syntax/lwt-syntax-options.cma syntax/lwt-syntax-options.cmxa syntax/lwt-syntax-options.a syntax/lwt-syntax-options.cmxs syntax/lwt-syntax-log.cma syntax/lwt-syntax-log.cmxa syntax/lwt-syntax-log.a syntax/lwt-syntax-log.cmxs examples/unix/logging.native examples/unix/relay.native examples/unix/parallelize.native -tag debug' terminated with error code 127")

(opam is a cygwin executable; ocaml is the native toolchain)

[aantron]

@braibant I believe this has been solved by Cygwin upstream, as pointed out by fdopen in the duplicate issue #173. Current Lwt does build on Cygwin now.

@msprotz: This looks like a problem with something other than Lwt, I would guess OCamlbuild, but perhaps OPAM instead. Please check those projects, and let me know if you are still having this issue, if you think it is with Lwt, and you would like to resolve it :)

[msprotz]

Apparently I managed to install it eventually so we're good. Thanks for the reply!

~ jonathan

From: Anton [mailto:notifications@github.com]
Sent: Monday, June 27, 2016 2:58 PM
To: ocsigen/lwt lwt@noreply.github.com
Cc: Jonathan Protzenko protz@microsoft.com; Mention mention@noreply.github.com
Subject: Re: [ocsigen/lwt] Cannot build on windows (Lwt 2.4.5) (#84)

@braibanthttps://github.com/braibant I believe this has been solved by Cygwin upstream, as pointed out by fdopen in the duplicate issue #173#173. Current Lwt does buildhttps://na01.safelinks.protection.outlook.com/?url=https%3a%2f%2fci.appveyor.com%2fproject%2faantron%2flwt%2fbuild%2f93%2fjob%2fwxco93cxoa5k1k9u&data=01%7c01%7cprotz%40microsoft.com%7cf25e7bb521ae459dffde08d39ed6c3d4%7c72f988bf86f141af91ab2d7cd011db47%7c1&sdata=ojSMcym64t6cLuZSLo3iVQdReW3gEB2mgl6qCa0LE44%3d on Cygwin now.

@msprotzhttps://github.com/msprotz: This looks like a problem with something other than Lwt, I would guess OCamlbuild, but perhaps OPAM instead. Please check those projects, and let me know if you are still having this issue, if you think it is with Lwt, and you would like to resolve it :)

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