Bug#1113236: llvm-toolchain-18: FTBFS with CMake 4

roehling at debian.org roehling at debian.org
Sun Aug 31 23:59:40 BST 2025 

Source: llvm-toolchain-18
Version: 1:18.1.8-18
Severity: serious
User: cmake at packages.debian.org
Usertags: cmake-4
Tags: ftbfs, forky, sid

Dear maintainer,

During a test rebuild for CMake 4, llvm-toolchain-18 failed to rebuild.

Log Summary:
-------------------------------------------------------------------------------
[...]
[2808/2829] cd /build/reproducible-path/llvm-toolchain-18-18.1.8/libclc/build && /usr/bin/cmake -E create_symlink tahiti-amdgcn-mesa-mesa3d.bc gfx1151-amdgcn-mesa-mesa3d.bc
[2809/2829] cd /build/reproducible-path/llvm-toolchain-18-18.1.8/libclc/build && /usr/bin/cmake -E create_symlink tahiti-amdgcn-mesa-mesa3d.bc gfx1200-amdgcn-mesa-mesa3d.bc
[2810/2829] cd /build/reproducible-path/llvm-toolchain-18-18.1.8/libclc/build && /usr/bin/cmake -E create_symlink tahiti-amdgcn-mesa-mesa3d.bc gfx1201-amdgcn-mesa-mesa3d.bc
[2811/2829] cd /build/reproducible-path/llvm-toolchain-18-18.1.8/libclc/build && /build/reproducible-path/llvm-toolchain-18-18.1.8/libclc/build/prepare_builtins -o nvptx--.bc builtins.opt.nvptx--.bc
[2812/2829] cd /build/reproducible-path/llvm-toolchain-18-18.1.8/libclc/build && /build/reproducible-path/llvm-toolchain-18-18.1.8/libclc/build/prepare_builtins -o nvptx--nvidiacl.bc builtins.opt.nvptx--nvidiacl.bc
[2813/2829] cd /build/reproducible-path/llvm-toolchain-18-18.1.8/libclc/build && /usr/bin/cmake -E create_symlink cedar-r600--.bc palm-r600--.bc
[2814/2829] cd /build/reproducible-path/llvm-toolchain-18-18.1.8/libclc/build && /usr/bin/cmake -E create_symlink cedar-r600--.bc sumo-r600--.bc
[2815/2829] cd /build/reproducible-path/llvm-toolchain-18-18.1.8/libclc/build && /usr/bin/cmake -E create_symlink cedar-r600--.bc sumo2-r600--.bc
[2816/2829] cd /build/reproducible-path/llvm-toolchain-18-18.1.8/libclc/build && /usr/bin/cmake -E create_symlink cedar-r600--.bc redwood-r600--.bc
[2817/2829] cd /build/reproducible-path/llvm-toolchain-18-18.1.8/libclc/build && /usr/bin/cmake -E create_symlink cedar-r600--.bc juniper-r600--.bc
[2818/2829] cd /build/reproducible-path/llvm-toolchain-18-18.1.8/libclc/build && /usr/bin/cmake -E create_symlink cypress-r600--.bc hemlock-r600--.bc
[2819/2829] cd /build/reproducible-path/llvm-toolchain-18-18.1.8/libclc/build && /usr/bin/cmake -E create_symlink barts-r600--.bc turks-r600--.bc
[2820/2829] cd /build/reproducible-path/llvm-toolchain-18-18.1.8/libclc/build && /usr/bin/cmake -E create_symlink barts-r600--.bc caicos-r600--.bc
[2821/2829] cd /build/reproducible-path/llvm-toolchain-18-18.1.8/libclc/build && /usr/bin/cmake -E create_symlink cayman-r600--.bc aruba-r600--.bc
[2822/2829] cd /build/reproducible-path/llvm-toolchain-18-18.1.8/libclc/build && /build/reproducible-path/llvm-toolchain-18-18.1.8/build-llvm/tools/clang/stage2-bins/bin/opt -o builtins.opt.spirv-mesa3d-.bc builtins.link.spirv-mesa3d-.bc
/build/reproducible-path/llvm-toolchain-18-18.1.8/build-llvm/tools/clang/stage2-bins/bin/opt: WARNING: failed to create target machine for 'spir-unknown-unknown': unable to get target for 'spir-unknown-unknown', see --version and --triple.
[2823/2829] cd /build/reproducible-path/llvm-toolchain-18-18.1.8/libclc/build && /usr/bin/llvm-spirv-18 --spirv-max-version=1.1 -o spirv-mesa3d-.spv builtins.link.spirv-mesa3d-.bc
[2824/2829] cd /build/reproducible-path/llvm-toolchain-18-18.1.8/libclc/build && /build/reproducible-path/llvm-toolchain-18-18.1.8/build-llvm/tools/clang/stage2-bins/bin/opt -o builtins.opt.spirv64-mesa3d-.bc builtins.link.spirv64-mesa3d-.bc
/build/reproducible-path/llvm-toolchain-18-18.1.8/build-llvm/tools/clang/stage2-bins/bin/opt: WARNING: failed to create target machine for 'spir64-unknown-unknown': unable to get target for 'spir64-unknown-unknown', see --version and --triple.
[2825/2829] cd /build/reproducible-path/llvm-toolchain-18-18.1.8/libclc/build && /usr/bin/llvm-spirv-18 --spirv-max-version=1.1 -o spirv64-mesa3d-.spv builtins.link.spirv64-mesa3d-.bc
[2826/2829] cd /build/reproducible-path/llvm-toolchain-18-18.1.8/libclc/build && /build/reproducible-path/llvm-toolchain-18-18.1.8/build-llvm/tools/clang/stage2-bins/bin/opt -O3 -o builtins.opt.nvptx64--.bc builtins.link.nvptx64--.bc
[2827/2829] cd /build/reproducible-path/llvm-toolchain-18-18.1.8/libclc/build && /build/reproducible-path/llvm-toolchain-18-18.1.8/libclc/build/prepare_builtins -o nvptx64--.bc builtins.opt.nvptx64--.bc
[2828/2829] cd /build/reproducible-path/llvm-toolchain-18-18.1.8/libclc/build && /build/reproducible-path/llvm-toolchain-18-18.1.8/build-llvm/tools/clang/stage2-bins/bin/opt -O3 -o builtins.opt.nvptx64--nvidiacl.bc builtins.link.nvptx64--nvidiacl.bc
[2829/2829] cd /build/reproducible-path/llvm-toolchain-18-18.1.8/libclc/build && /build/reproducible-path/llvm-toolchain-18-18.1.8/libclc/build/prepare_builtins -o nvptx64--nvidiacl.bc builtins.opt.nvptx64--nvidiacl.bc
touch stamps/debian-libclc-build
Building compiler-rt for wasm32
Using cmake: cmake
mkdir -p "build-wasm/compiler-rt-wasm32"
cmake -B "build-wasm/compiler-rt-wasm32" -S compiler-rt/lib/builtins/ \
	-G Ninja \
	 \
	-DCMAKE_SYSTEM_NAME=Generic \
	-DCMAKE_C_COMPILER_TARGET=wasm32-unknown-unknown \
	-DCMAKE_CXX_COMPILER_TARGET=wasm32-unknown-unknown \
	-DCMAKE_ASM_COMPILER_TARGET=wasm32-unknown-unknown \
	-DCMAKE_C_COMPILER=/build/reproducible-path/llvm-toolchain-18-18.1.8/build-llvm/tools/clang/stage2-bins/bin/clang \
	-DCMAKE_CXX_COMPILER=/build/reproducible-path/llvm-toolchain-18-18.1.8/build-llvm/tools/clang/stage2-bins/bin/clang++ \
	-DCMAKE_C_FLAGS="-O2 -DNDEBUG -g1 -Werror=implicit-function-declaration -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -Wno-unused-command-line-argument -Wdate-time -D_FORTIFY_SOURCE=2" \
	-DCMAKE_CXX_FLAGS="-O2 -DNDEBUG -g1 -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -Wno-unused-command-line-argument -Wdate-time -D_FORTIFY_SOURCE=2" \
	-DCMAKE_SHARED_LINKER_FLAGS="-Wl,-z,relro -Wl,--build-id,--as-needed -L/build/reproducible-path/llvm-toolchain-18-18.1.8/build-llvm/tools/clang/stage2-bins/lib" \
	-DCMAKE_MODULE_LINKER_FLAGS="-Wl,-z,relro -Wl,--build-id,--as-needed -L/build/reproducible-path/llvm-toolchain-18-18.1.8/build-llvm/tools/clang/stage2-bins/lib" \
	-DCMAKE_EXE_LINKER_FLAGS="-Wl,-z,relro -Wl,--build-id,--as-needed -L/build/reproducible-path/llvm-toolchain-18-18.1.8/build-llvm/tools/clang/stage2-bins/lib" \
	-DCMAKE_INSTALL_PREFIX=/usr/lib/llvm-18/lib/clang/18 \
	-DCMAKE_INSTALL_DATADIR=lib \
	-DCMAKE_INSTALL_INCLUDEDIR=include \
	-DLLVM_CMAKE_DIR=/build/reproducible-path/llvm-toolchain-18-18.1.8/build-llvm/tools/clang/stage2-bins/bin/../ \
	-DCOMPILER_RT_STANDALONE_BUILD=ON \
	-DCOMPILER_RT_BAREMETAL_BUILD=ON \
	-DCOMPILER_RT_INCLUDE_TESTS=OFF \
	-DCOMPILER_RT_USE_LIBCXX=OFF \
	-DCOMPILER_RT_USE_BUILTINS_LIBRARY=ON \
	-DCOMPILER_RT_DEFAULT_TARGET_TRIPLE=wasm32-unknown-unknown \
	-DCOMPILER_RT_OS_DIR=wasi
-- The C compiler identification is Clang 18.1.8
-- The ASM compiler identification is Clang with GNU-like command-line
-- Found assembler: /build/reproducible-path/llvm-toolchain-18-18.1.8/build-llvm/tools/clang/stage2-bins/bin/clang
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /build/reproducible-path/llvm-toolchain-18-18.1.8/build-llvm/tools/clang/stage2-bins/bin/clang - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Looking for unwind.h
-- Looking for unwind.h - found
-- Looking for rpc/xdr.h
-- Looking for rpc/xdr.h - not found
-- Could NOT find FFI (missing: FFI_LIBRARIES HAVE_FFI_CALL) 
-- Looking for histedit.h
-- Looking for histedit.h - not found
-- Could NOT find LibEdit (missing: LibEdit_INCLUDE_DIRS LibEdit_LIBRARIES) 
-- Could NOT find Terminfo (missing: Terminfo_LIBRARIES Terminfo_LINKABLE) 
-- Could NOT find ZLIB (missing: ZLIB_LIBRARY ZLIB_INCLUDE_DIR) 
-- Could NOT find zstd (missing: zstd_LIBRARY zstd_INCLUDE_DIR) 
-- Found LibXml2: /usr/lib/aarch64-linux-gnu/libxml2.so (found version "2.14.5")
-- Found CURL: /usr/lib/aarch64-linux-gnu/libcurl.so (found version "8.16.0-rc2")
CMake Error at /build/reproducible-path/llvm-toolchain-18-18.1.8/build-llvm/tools/clang/stage2-bins/lib/cmake/llvm/LLVMExports.cmake:1450 (add_library):
  ADD_LIBRARY called with SHARED option but the target platform does not
  support dynamic linking.
Call Stack (most recent call first):
  /build/reproducible-path/llvm-toolchain-18-18.1.8/build-llvm/tools/clang/stage2-bins/lib/cmake/llvm/LLVMConfig.cmake:376 (include)
  /build/reproducible-path/llvm-toolchain-18-18.1.8/compiler-rt/cmake/Modules/CompilerRTUtils.cmake:303 (find_package)
  CMakeLists.txt:29 (load_llvm_config)


-- Configuring incomplete, errors occurred!
make[1]: *** [debian/rules:962: build-wasm/compiler-rt-wasm32] Error 1
make[1]: Leaving directory '/build/reproducible-path/llvm-toolchain-18-18.1.8'
make: *** [debian/rules:601: binary] Error 2
dpkg-buildpackage: error: debian/rules binary subprocess returned exit status 2
--------------------------------------------------------------------------------
Build finished at 2025-08-30T13:32:12Z

-------------------------------------------------------------------------------

The above is just how the build ends and not necessarily the most relevant part.
If required, the full build log is available here (for the next 30 days):
https://debusine.debian.net/artifact/2407001/

The most likely cause of build failures is the removed backwards compatibility for
CMake versions earlier than 3.5. You can find additional information in my
debian-devel announcement:

https://lists.debian.org/debian-devel/2025/04/msg00310.html

About the archive rebuild: The build was made on debusine.debian.net,
using sbuild.

You can find the build task here:
https://debusine.debian.net/work-request/153970/

If this is really a bug in one of the build-depends, please use
reassign and affects, so that this is still visible in the BTS web
page for this package.

Thanks,
Timo

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