Le 03/08/2020 à 11:49, Lucas Nussbaum a écrit : > During an archive rebuild in unstable/amd64, I ran into many similar > failures, affecting only ocaml packages (see the list in Affects). An > example is yojson: > >> make[1]: Leaving directory '/tmp/yojson-1.7.0' >> dh_dwz >> dwz -- debian/libyojson-ocaml-dev/usr/bin/ydump >> dwz: debian/libyojson-ocaml-dev/usr/bin/ydump: DWARF version 0 unhandled >> dh_dwz: error: dwz -- debian/libyojson-ocaml-dev/usr/bin/ydump returned exit >> code 1 >> make: *** [debian/rules:19: binary] Error 1 >> dpkg-buildpackage: error: debian/rules binary subprocess returned exit >> status 2 > > I don't understand what happens here. > > The produced binary seems to be a valid ELF binary: >> # file debian/libyojson-ocaml-dev/usr/bin/ydump >> debian/libyojson-ocaml-dev/usr/bin/ydump: ELF 64-bit LSB shared object, >> x86-64, version 1 (SYSV), dynamically linked, interpreter >> /lib64/ld-linux-x86-64.so.2, >> BuildID[sha1]=eef3c12415e20f123d1c5432747bea6b33c015cd, for GNU/Linux 3.2.0, >> with debug_info, not stripped > > But its debugging info seems to be corrupt, as also shown by dwarfdump: >> # dwarfdump debian/libyojson-ocaml-dev/usr/bin/ydump >> >> .debug_info >> >> dwarfdump ERROR: Failure reading CU header or DIE, corrupt DWARF: >> DW_DLE_VERSION_STAMP_ERROR (48). Attempting to continue. >> dwarfdump ERROR: attempting to print .debug_info: >> DW_DLE_VERSION_STAMP_ERROR (48) (48) >> attempting to continue. >> >> .debug_str >> name at offset 0x00000000, length 11 is 'std_exit.ml' >> name at offset 0x0000000c, length 8 is './stdlib' >> name at offset 0x00000015, length 11 is 'GNU AS 2.35' >> name at offset 0x00000021, length 12 is 'bin/ydump.ml' >> [...] > > Note: I filed this against dh-ocaml, but another package might be at > fault here.
binutils dropped support for the DWARF version produced by ocamlopt. This is #965372. I don't see what can be done from OCaml side, except waiting for ocamlopt to produce modern DWARF. Meanwhile, empty dh_dwz overrides are being added. Cheers, -- Stéphane
