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Bug#1015560: ocaml: ftbfs with LTO (link time optimization) enabled



Package: src:ocaml
Version: 4.13.1-3
Severity: minor
Tags: sid bookworm
User: debian-gcc@lists.debian.org
Usertags: ftbfs-lto

This package currently fails to build (at least on the amd64
architecture) with link time optimizations enabled.  For a background
for LTO please see

https://wiki.debian.org/ToolChain/LTO

The goal is to enable this optimization by default in an upcoming
Debian release in dpkg-buildflags for 64bit architectures.  The goal
is to get this package to build with link time optimizations, or to
explicitly disable link time optimizations for this package build.

To reproduce the build failure, enable the lto optimization in
testing/unstable by adding "optimize=+lto" to DEB_BUILD_MAINT_OPTIONS
in the debian/rules file, or if this macro is unset, just set it:

export DEB_BUILD_MAINT_OPTIONS = optimize=+lto

Please try to fix the build with lto enabled, fixing the packaging or
forwarding the issue upstream. If the issue cannot be fixed,
explicitly disallow building the package with lto by adding to your
rules file:

export DEB_BUILD_MAINT_OPTIONS = optimize=-lto

or adding that string to your existing setting of DEB_BUILD_MAINT_OPTIONS.

The full build log can be found at:
http://qa-logs.debian.net/2022/06/09/dpkglto/ocaml_4.13.1-3_unstable_dpkglto.log
The last lines of the build log are at the end of this report.

[...]
 ... testing 'w68.ml' with 1.1.1 (check-ocamlopt.byte-output) => passed
 ... testing 'w68.ml' with 1.1.1.1 (run) => passed
 ... testing 'w68.ml' with 1.1.1.1.1 (check-program-output) => passed
Running tests from 'tests/win-unicode' ...
 ... testing 'mltest.ml' with 1 (windows-unicode) => skipped (Windows Unicode support not available)
 ... testing 'mltest.ml' with 1.1 (toplevel) => n/a


List of skipped tests:
    tests/runtime-errors/'syserror.ml' with 2.1.1.2 (libwin32unix) 
    tests/warnings/'w55.ml' with 3 (flambda) 
    tests/basic-modules/'anonymous.ml' with 2.1.2 (flambda) 
    tests/manual-intf-c
    tests/unwind
    tests/asmcomp/'is_static_flambda.ml' with 1 (flambda) 
    tests/lib-unix/isatty/'isatty_tty.ml' with 1 (libwin32unix) 
    tests/asmcomp/'func_sections.ml' with 1.4 (arch_i386) 
    tests/flambda/'gpr2239.ml' with 1 (flambda) 
    tests/lib-dynlink-csharp
    tests/asmcomp/'unrolling_flambda.ml' with 1 (flambda) 
    tests/runtime-errors/'syserror.ml' with 1.1.1.2 (libwin32unix) 
    tests/lib-unix/unix-execvpe/'exec.ml' with 1.1 (script) 
    tests/runtime-errors/'stackoverflow.ml' with 2 (libwin32unix) 
    tests/win-unicode
    tests/typing-unboxed-types/'test_no_flat.ml' with 1 (no-flat-float-array) 
    tests/lib-unix/win-env
    tests/asmcomp/'func_sections.ml' with 1.1 (arch_arm) 
    tests/asmcomp/'unrolling_flambda2.ml' with 1 (flambda) 
    tests/flambda/'approx_meet.ml' with 1 (flambda) 
    tests/asmcomp/'func_sections.ml' with 1.2 (arch_arm64) 
    tests/warnings/'w59.ml' with 3 (flambda) 
    tests/statmemprof/'callstacks.ml' with 2 (no-flat-float-array) 
    tests/typing-misc/'pr6939-no-flat-float-array.ml' with 1 (no-flat-float-array) 
    tests/lib-unix/win-stat
    tests/asmgen/'integr.cmm' with 1 (skip) 
    tests/flambda/'afl_lazy.ml' with 1 (flambda) 
    tests/lib-bigarray-2/'bigarrfml.ml' with 1 (script) 
    tests/afl-instrumentation/'afltest.ml' with 1.1 (script) 
    tests/flambda/'specialise.ml' with 1 (flambda) 
    tests/lib-unix/win-symlink
    tests/asmcomp/'static_float_array_flambda.ml' with 1 (flambda) 
    tests/translprim/'array_spec.ml' with 1.1.2 (no-flat-float-array) 
    tests/translprim/'module_coercion.ml' with 1.1.2 (no-flat-float-array) 
    tests/letrec-check/'no_flat_float_array.ml' with 1 (no-flat-float-array) 
    tests/asmcomp/'lift_mutable_let_flambda.ml' with 1 (flambda) 
    tests/arch-power
    tests/tool-caml-tex/'redirections.ml' with 1.1.2 (no-shared-libraries) 
    tests/asmcomp/'static_float_array_flambda_opaque.ml' with 1 (flambda) 

List of failed tests:
    tests/output-complete-obj/'test.ml' with 2.1.1 (script) 

Summary:
  2879 tests passed
   39 tests skipped
    1 tests failed
  102 tests not started (parent test skipped or failed)
    0 unexpected errors
  3021 tests considered
#### Something failed. Exiting with error status.

make[4]: *** [Makefile:332: report] Error 4
make[3]: *** [Makefile:148: all] Error 2
make[3]: Leaving directory '/<<PKGBUILDDIR>>/testsuite'
make[2]: *** [debian/rules:278: override_dh_auto_test] Error 2
make[2]: Leaving directory '/<<PKGBUILDDIR>>'
make[1]: *** [debian/rules:87: build] Error 2
make[1]: Leaving directory '/<<PKGBUILDDIR>>'
make: *** [debian/rules:82: binary] Error 2
dpkg-buildpackage: error: debian/rules binary subprocess returned exit status 2


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