Bug#878235: lwt: FTBFS on arm64,i386,ppc64el,s390x,powerpc,ppc64: Files /usr/lib/ocaml/ppx_tools/ppx_tools.cmxa and /usr/lib/ocaml/compiler-libs/ocamlcommon.cmxa make inconsistent assumptions over implementation Location

[Simon McVittie <smcv@debian.org>]

Source: lwt
Version: 2.7.1-1
Severity: serious
Justification: fails to build from source (but built successfully in the past)
Control: block 871469 by -1

https://buildd.debian.org/status/fetch.php?pkg=lwt&arch=arm64&ver=2.7.1-1&stamp=1507629114&raw=0
https://buildd.debian.org/status/fetch.php?pkg=lwt&arch=i386&ver=2.7.1-1&stamp=1507629135&raw=0
https://buildd.debian.org/status/fetch.php?pkg=lwt&arch=ppc64el&ver=2.7.1-1&stamp=1507629408&raw=0
https://buildd.debian.org/status/fetch.php?pkg=lwt&arch=s390x&ver=2.7.1-1&stamp=1507629228&raw=0
https://buildd.debian.org/status/fetch.php?pkg=lwt&arch=powerpc&ver=2.7.1-1&stamp=1507629330&raw=0
https://buildd.debian.org/status/fetch.php?pkg=lwt&arch=ppc64&ver=2.7.1-1&stamp=1507629496&raw=0

findlib: [WARNING] Interface topdirs.cmi occurs in several directories: /usr/lib/ocaml, /usr/lib/ocaml/compiler-libs
File "_none_", line 1:
Error: Files /usr/lib/ocaml/ppx_tools/ppx_tools.cmxa
       and /usr/lib/ocaml/compiler-libs/ocamlcommon.cmxa
       make inconsistent assumptions over implementation Location
Command exited with code 2.
E: Failure("Command ''/usr/bin/ocamlbuild' 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.so 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/glib/liblwt-glib_stubs.a src/glib/dlllwt-glib_stubs.so src/glib/lwt-glib.cma src/glib/lwt-glib.cmxa src/glib/lwt-glib.a src/glib/lwt-glib.cmxs src/ssl/lwt-ssl.cma src/ssl/lwt-ssl.cmxa src/ssl/lwt-ssl.a src/ssl/lwt-ssl.cmxs src/camlp4/lwt-syntax.cma src/camlp4/lwt-syntax.cmxa src/camlp4/lwt-syntax.a src/camlp4/lwt-syntax.cmxs src/camlp4/lwt-syntax-options.cma src/camlp4/lwt-syntax-options.cmxa src/camlp4/lwt-syntax-options.a src/camlp4/lwt-syntax-options.cmxs src/camlp4/lwt-syntax-log.cma src/camlp4/lwt-syntax-log.cmxa src/camlp4/lwt-syntax-log.a src/camlp4/lwt-syntax-log.cmxs src/ppx/ppx.cma src/ppx/ppx.cmxa src/ppx/ppx.a src/ppx/ppx.cmxs src/ppx/ppx_lwt_ex.native doc/examples/unix/logging.native doc/examples/unix/relay.native doc/examples/unix/parallelize.native tests/test.cma tests/test.cmxa tests/test.a tests/test.cmxs tests/core/main.native tests/unix/main.native tests/react/main.native tests/preemptive/main.native tests/ppx/main.native -use-ocamlfind -plugin-tags 'package(cppo_ocamlbuild)' -tag debug -tag tests' terminated with error code 10")