DFSG, Licensing & New Packages Team

llvm-toolchain-23 (1:23.1.0-rc1-1~exp1) experimental; urgency=medium
 .
   [ Sylvestre Ledru ]
   * Branching of 23 and new upstream release
   * d/rules: set SCCACHE_BASEDIR to keep sccache cache hits across the
     changing build directory paths
   * d/patches/wasm/wasm-libcxx-ibm-skip-wasi.diff: skip the libcxx ibm.h
     fallback redeclarations of strtod_l/strtof_l/strtold_l/vasprintf on
     WASI. They are already provided by the WASI sysroot libc headers
     without __abi_tag__, and clang rejects redeclarations that add
     abi_tag via _LIBCPP_HIDE_FROM_ABI, breaking the libcxx wasm32-wasi
     build.
   * libclc: the .bc files moved to +usr/lib/llvm-23/lib/clang/23/lib/*/*.bc
   * d/rules: on trixie/arm64, drop -mbranch-protection=* from CFLAGS/CXXFLAGS/
     LDFLAGS to work around flang SIGILL when generating __fortran_builtins.mod.
   * d/rules: Fail the build if debian/control is regenerated, except for
     apt.llvm.org snapshot builds where the substitutions legitimately
     differ between snapshots. Modifying debian/control during the build
     is forbidden by Debian policy and breaks reproducibility.
     (Closes: #1130335)
   * d/rules: Drop the dead libc++/libomp/libunwind move version-cap sed
     hack. The version string it tried to rewrite no longer appears in
     debian/control.in, so the substitution was a no-op.
   * d/rules: Extend the regenerate-vs-fail check to debian/watch,
     debian/packages.ocaml and debian/packages.libclc. These three files
     are also tracked in git, kept by override_dh_auto_clean and rewritten
     in place by the substitution loop, so they have the same drift risk
     as debian/control.
   * d/source-integrity.mk: Move the source-package integrity logic
     (APT_LLVM_ORG, GENERATED_TRACKED_FILES and the snapshot/verify canned
     recipes) into a dedicated include file. Keeps debian/rules focused on
     the build itself.
   * d/tests.mk: Move the override_dh_auto_test definition (the whole
     ifeq RUN_TEST block, ARCH_LLVM_TEST_OK and the lcov coverage tail)
     into a dedicated include file. Pure relocation, no behavioural
     change.
   * d/build-wasm-mingw.mk: Move the wasm32/wasm64 + mingw-w64
     compiler-rt and libcxx pattern rules, the STAGE_2_WASM_C(XX)FLAGS
     filters and the stamps/debian-{wasm,mingw}-build aggregators into a
     dedicated include file. Pure relocation, no behavioural change.
   * d/p/offload-plugins-depend-on-offloadapi.diff: Make the
     omptarget.rtl.<plugin> libraries depend on the OffloadAPI tablegen
     target so the generated OffloadAPI.h header is produced before
     plugins-nextgen sources are compiled. Fixes parallel-build failure
     "fatal error: 'OffloadAPI.h' file not found" seen on Ubuntu noble
     amd64. (Refs: llvm/llvm-project#196690, llvm/llvm-project#142756)
   * enable PRIF (coarray) support
     thanks to Alastair McKinstry
     (Closes: #1136346)
   * d/patches/offload-restore-soversion.diff: Restore VERSION/SOVERSION on
     LLVMOffload and omptarget shared libraries. Upstream commit 3383f0d6fe01
     dropped add_llvm_library() (which implicitly set them to
     LLVM_VERSION_MAJOR.LLVM_VERSION_MINOR), producing unversioned .so files
     and breaking dh_install for liboffload-23.
   * d/rules: set SCCACHE_BASEDIR to keep sccache cache hits across the
     changing build directory paths
   * d/rules: set SCCACHE_IDLE_TIMEOUT=0 so the sccache server stays alive for
     the whole build; otherwise it idles out (default 600s) during the quiet
     final-link phase and the libfuzzer step auto-spawns a default-config server
     writing to $HOME/.cache/sccache, which fails with HOME=/nonexistent
   * d/rules: use the shared GCS sccache cache on arm64 too (add arm64 to the
     GCP arch filter)
 .
   [ Max Gilmour ]
   * Add patch headers to certain undocumented patches:
     - d/p/clang-baseline-fix-i386.patch
     - d/p/clang-arm-default-vfp3-on-armv7a.patch
     - d/p/openmp-soname.diff
     - d/p/clang-format-version.diff
 .
   [ Sylvestre Ledru ]
   * d/rules: Also drop the Windows compiler-rt builtins from
     libclang-rt-X.Y-dev (they belong to libclang-rt-X.Y-dev-win). The
     greedy lib/*/*clang_rt* glob shipped them in both packages, causing a
     dpkg "trying to overwrite" conflict that broke the autopkgtest install
     on bookworm. Removed the ineffective rm -f in override_dh_auto_install
     (ran before dh_install and used the wrong path) in favour of the
     rm -fr after dh_install, next to the wasi cleanup.
   * d/rules: Fix a make parse error ("recipe commences before first
     target") on distributions shipping sccache < 0.14 (e.g. focal): the
     sccache SCCACHE_BASEDIR version-guard block was tab-indented, so the
     $(warning) line was treated as a recipe. Indent the block with spaces.
   * d/rules: Disable the Z3 solver on releases shipping libz3 < 4.8.9
     (focal). LLVM requires Z3 >= 4.8.9, so on focal
     (libz3 4.8.7) the stage-2 cmake configure failed with
     "LLVM_ENABLE_Z3_SOLVER cannot be enabled when Z3 is not available".
   * d/rules: Drop llvm-mt from the install list when it wasn't built.
     Upstream only builds llvm-mt when it detects libxml2 at configure
     time; on Ubuntu focal/arm64 the libxml2 symbol check fails and the
     tool is silently skipped, which made dh_install --fail-missing abort
     on usr/lib/llvm-23/bin/llvm-mt and usr/bin/llvm-mt-23.

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