dune failed to be built on bytecode-only archs

[andyli]

On bytecode-only archs (e.g. armel, mips, ia64), building dune failed with the error:

'/usr/bin/ocamldep' -modules src/xdg/xdg.ml > boot-depends.txt
'/usr/bin/ocamlc' -g -w -40 -o boot.exe unix.cma boot.ml
./boot.exe
Failed to parse the output of '/usr/bin/ocamlc -config':
Variable "asm" contains only spaces.
make[1]: *** [debian/rules:20: override_dh_auto_build] Error 1
make[1]: Leaving directory '/<<PKGBUILDDIR>>'
make: *** [debian/rules:11: build-arch] Error 2

This affects updating the debian package from 1.0 beta18 to 1.0 beta19.
1.0 beta18 can be built successfully.

[rgrinberg]

Yeah, that's a bummer. I suppose that we shouldn't require an assembler for bytecode only.

Would you mind posting the output of $ /usr/bin/ocamlc -config. Just to see what other fields can be missing on bytecode only.

[andyli]

Here is the output I got from a mips docker image (multiarch/debian-debootstrap:mips-stretch):

root@25ee2be51405:/# /usr/bin/ocamlc -config
version: 4.02.3
standard_library_default: /usr/lib/ocaml
standard_library: /usr/lib/ocaml
standard_runtime: /usr/bin/ocamlrun
ccomp_type: cc
bytecomp_c_compiler: gcc -O -fno-defer-pop -Wall -D_FILE_OFFSET_BITS=64 -D_REENTRANT -O -fPIC
bytecomp_c_libraries: -lm  -ldl -lcurses -lpthread
native_c_compiler: gcc -O -Wall -D_FILE_OFFSET_BITS=64 -D_REENTRANT
native_c_libraries: -lm  -ldl
native_pack_linker: ld -r  -o 
ranlib: ranlib
cc_profile: -pg
architecture: none
model: default
system: unknown
asm: 
asm_cfi_supported: false
with_frame_pointers: false
ext_obj: .o
ext_asm: .s
ext_lib: .a
ext_dll: .so
os_type: Unix
default_executable_name: a.out
systhread_supported: true
host: mips-unknown-linux-gnu
target: mips-unknown-linux-gnu
exec_magic_number: Caml1999X011
cmi_magic_number: Caml1999I017
cmo_magic_number: Caml1999O010
cma_magic_number: Caml1999A011
cmx_magic_number: Caml1999Y014
cmxa_magic_number: Caml1999Z013
ast_impl_magic_number: Caml1999M016
ast_intf_magic_number: Caml1999N015
cmxs_magic_number: Caml2007D002
cmt_magic_number: Caml2012T004

[rgrinberg]

Should be fixed in master.

[andyli]

I've just tried with beta19.1, but it gave the same error as before.

You may find it useful to test it yourself:

docker run -it --rm multiarch/debian-debootstrap:mips-stretch bash
apt update
apt install ocaml-nox git
git clone https://github.com/ocaml/dune.git
cd dune
./configure
ocaml bootstrap.ml
./boot.exe

[rgrinberg]

Andy Li <notifications@github.com> writes:

I've just tried with beta19.1, but it gave the same error as before. You may find it useful to test it yourself:

But I need a mips machine or VM for this, right? I will investigate this issue further regardless

[andyli]

But I need a mips machine or VM for this, right?

Nop, the docker image can be run on a normal x86_64 host. It uses qemu under the hook.

[rgrinberg]

I get this error using it on docker for mac:

standard_init_linux.go:195: exec user process caused "exec format error"

[andyli]

Hmmm.. I only ran it in a Ubuntu host.
I guess you have to use a Linux VM to run the docker container then...

[treinen]

Hello,

I just tried to build dune 1.0-beta19.1 on a mips machine:

tar xf dune-1.0-beta19.1.tar.gz
cd dune-1.0-beta19.1
make release

This fails with:

'/usr/bin/ocamldep' -modules src/usexp/usexp.ml src/usexp/parser_automaton_internal.ml src/usexp/sexp_ast.ml src/usexp/table.ml > boot-depends.txt
'/usr/bin/ocamldep' -modules src/xdg/xdg.ml > boot-depends.txt
'/usr/bin/ocamlc' -g -w -40 -o boot.exe unix.cma boot.ml
./boot.exe
Failed to parse the output of '/usr/bin/ocamlc -config':
Variable "asm" contains only spaces.
make: *** [Makefile:10: release] Error 1

-Ralf.

[rgrinberg]

You will have to use master until the next release. 19.1 failed to address the issue

…

On Thu, Mar 22, 2018, 5:44 AM Ralf Treinen ***@***.***> wrote: Hello, I just tried to build dune 1.0-beta19.1 on a mips machine: tar xf dune-1.0-beta19.1.tar.gz cd dune-1.0-beta19.1 make release This fails with: '/usr/bin/ocamldep' -modules src/usexp/usexp.ml src/usexp/ parser_automaton_internal.ml src/usexp/sexp_ast.ml src/usexp/table.ml > boot-depends.txt '/usr/bin/ocamldep' -modules src/xdg/xdg.ml > boot-depends.txt '/usr/bin/ocamlc' -g -w -40 -o boot.exe unix.cma boot.ml ./boot.exe Failed to parse the output of '/usr/bin/ocamlc -config': Variable "asm" contains only spaces. make: *** [Makefile:10: release] Error 1 -Ralf. — You are receiving this because you modified the open/close state. Reply to this email directly, view it on GitHub <#637 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAIe--O6QCPnQXffFjNzDu04FWgsyDBdks5tgsmfgaJpZM4SxIl8> .

[rgrinberg]

Actually, we'll just defer this fix to beta20 and release it promptly (very little reason to wait for beta20 anyway)

[treinen]

OK, f8225b1 compiles fine on mips. Thanks -Ralf.

[andyli]

@rgrinberg Gentle ping on the beta 20 release :)