ocamlbuild -where is incorrect

[jonahbeckford]

This affects the compile of ptime.1.1.0:

#=== ERROR while compiling ptime.1.1.0 ========================================#
# context     2.2.0~alpha0~20221228 | win32/x86_64 | conf-withdkml.2 ocaml-system.4.14.0 | pinned(https://erratique.ch/software/ptime/releases/ptime-1.1.0.tbz)
# path        Z:\source\dkml\build\_deps\dkml-component-opam-src\_opam\.opam-switch\build\ptime.1.1.0
# command     C:\Users\beckf\AppData\Local\Programs\DKMLNA~1\bin\WITH-D~1.EXE ocaml pkg/pkg.ml build --dev-pkg false
# exit-code   1
# env-file    C:\Users\beckf\AppData\Local\opam\log\ptime-14852-cd981d.env
# output-file C:\Users\beckf\AppData\Local\opam\log\ptime-14852-cd981d.out
### output ###
# [...]
# pkg.ml: [ERROR] cmd ["ocamlbuild" "-use-ocamlfind" "-classic-display" "-j" "4" "-tag" "debug"
#      "-build-dir" "_build" "opam" "pkg/META" "CHANGES.md" "LICENSE.md"
#      "README.md" "src/ptime.lib" "src/ptime.cmxs" "src/ptime.cmxa"
#      "src/ptime.cma" "src/ptime.cmx" "src/ptime.cmi" "src/ptime.mli"
#      "src/ptime_top.lib" "src/ptime_top.cmxs" "src/ptime_top.cmxa"
#      "src/ptime_top.cma" "src/ptime_top.cmx" "src/ptime_top_init.ml"
#      "src-clock/ptime_clock.lib" "src-clock/ptime_clock.cmxs"
#      "src-clock/ptime_clock.cmxa" "src-clock/ptime_clock.cma"
#      "src-clock/ptime_clock.cmx" "src-clock/ptime_clock.cmi"
#      "src-clock/ptime_clock.mli" "src-clock/dllptime_clock_stubs.dll"
#      "src-clock/libptime_clock_stubs.lib" "src-clock/runtime.js"
#      "doc/index.mld" "test/min_clock.ml"]: exited with 2

with .out log:

Warning: Won't be able to compile a native plugin
Failure: Cannot find "ocamlbuild.cmo" in ocamlbuild -where directory.
pkg.ml: [ERROR] cmd ["ocamlbuild" "-use-ocamlfind" "-classic-display" "-j" "4" "-tag" "debug"
     "-build-dir" "_build" "opam" "pkg/META" "CHANGES.md" "LICENSE.md"
     "README.md" "src/ptime.lib" "src/ptime.cmxs" "src/ptime.cmxa"
     "src/ptime.cma" "src/ptime.cmx" "src/ptime.cmi" "src/ptime.mli"
     "src/ptime_top.lib" "src/ptime_top.cmxs" "src/ptime_top.cmxa"
     "src/ptime_top.cma" "src/ptime_top.cmx" "src/ptime_top_init.ml"
     "src-clock/ptime_clock.lib" "src-clock/ptime_clock.cmxs"
     "src-clock/ptime_clock.cmxa" "src-clock/ptime_clock.cma"
     "src-clock/ptime_clock.cmx" "src-clock/ptime_clock.cmi"
     "src-clock/ptime_clock.mli" "src-clock/dllptime_clock_stubs.dll"
     "src-clock/libptime_clock_stubs.lib" "src-clock/runtime.js"
     "doc/index.mld" "test/min_clock.ml"]: exited with 2

Root cause

When running opam exec -- ocamlbuild -where I get Z:/source/dkmuild/_deps/dkml-component-opam-src/_opam/lib/ocamlbuild which is incorrect. The source/dkmuild should be source/dkmlbuild which obviously is an earlier unescaping of \b into a backspace.

[jonahbeckford]

Have fixed this by having a patched ocamlbuild in diskuv/diskuv-opam-repository@7394a2d, and then moving the diskuv-opam-repository tag 2.0.3.

That does mean that if 2.0.3 users experience this problem and they installed on or before 2023-09-19, then they will need to:

opam update diskuv-2.0.3 # oncde
opam upgrade ocamlbuild # in each local switch

Keeping this open for users to see ...