Flags.write_lines raises Code_error #1166
Description
Consider the following dune and discover.ml files:
(executable
(name discover)
(modules discover)
(libraries dune.configurator))let () =
let module C = Configurator.V1 in
C.main ~name:"foo" (fun _c ->
C.Flags.write_lines "foo" ["asdf"])Executing the application with dune exec ./discover.exe gives:
run: /Users/mmottl/.opam/4.07.0/bin/ocamlc.opt -config
-> process exited with code 0
-> stdout:
| version: 4.07.0
| standard_library_default: /Users/mmottl/.opam/4.07.0/lib/ocaml
| standard_library: /Users/mmottl/.opam/4.07.0/lib/ocaml
| standard_runtime: /Users/mmottl/.opam/4.07.0/bin/ocamlrun
| ccomp_type: cc
| c_compiler: cc
| ocamlc_cflags: -O2 -fno-strict-aliasing -fwrapv
| ocamlc_cppflags: -D_FILE_OFFSET_BITS=64 -D_REENTRANT
| ocamlopt_cflags: -O2 -fno-strict-aliasing -fwrapv
| ocamlopt_cppflags: -D_FILE_OFFSET_BITS=64 -D_REENTRANT
| bytecomp_c_compiler: cc -O2 -fno-strict-aliasing -fwrapv -D_FILE_OFFSET_BITS=64 -D_REENTRANT
| native_c_compiler: cc -O2 -fno-strict-aliasing -fwrapv -D_FILE_OFFSET_BITS=64 -D_REENTRANT
| bytecomp_c_libraries: -lpthread
| native_c_libraries:
| native_pack_linker: ld -r -o
| ranlib: ranlib
| cc_profile: -pg
| architecture: amd64
| model: default
| int_size: 63
| word_size: 64
| system: macosx
| asm: clang -arch x86_64 -Wno-trigraphs -c
| asm_cfi_supported: true
| with_frame_pointers: false
| ext_exe:
| ext_obj: .o
| ext_asm: .s
| ext_lib: .a
| ext_dll: .so
| os_type: Unix
| default_executable_name: a.out
| systhread_supported: true
| host: x86_64-apple-darwin17.7.0
| target: x86_64-apple-darwin17.7.0
| profiling: true
| flambda: false
| spacetime: false
| safe_string: false
| default_safe_string: true
| flat_float_array: true
| afl_instrument: false
| windows_unicode: false
| exec_magic_number: Caml1999X023
| cmi_magic_number: Caml1999I023
| cmo_magic_number: Caml1999O023
| cma_magic_number: Caml1999A023
| cmx_magic_number: Caml1999Y023
| cmxa_magic_number: Caml1999Z023
| ast_impl_magic_number: Caml1999M023
| ast_intf_magic_number: Caml1999N023
| cmxs_magic_number: Caml1999D023
| cmt_magic_number: Caml1999T023
-> stderr:
Fatal error: exception Stdune__Exn.Code_error(_)
The error message associated with Code_error is: build_dir: cannot use build dir before it's set.
Is this a bug or do I need to do anything differently?
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