Jungfraujoch/CMakeLists.txt

CMAKE_MINIMUM_REQUIRED(VERSION 3.26)

FILE(STRINGS VERSION JFJOCH_VERSION)

PROJECT(jfjoch VERSION 1.0.0 LANGUAGES C CXX)
SET(CMAKE_POLICY_DEFAULT_CMP0077 NEW)

SET(CMAKE_CXX_STANDARD 20)
SET(CMAKE_CXX_STANDARD_REQUIRED True)

SET(JFJOCH_WRITER_ONLY           OFF CACHE BOOL "Compile HDF5 writer only")
SET(JFJOCH_INSTALL_DRIVER_SOURCE OFF CACHE BOOL "Install kernel driver source (ignored if building writer only; necessary for RPM building)")
SET(JFJOCH_USE_CUDA              ON CACHE BOOL "Compile Jungfraujoch with CUDA")
SET(JFJOCH_VIEWER_BUILD          OFF CACHE BOOL "Compile Jungfraujoch viewer")

# Only the viewer (and its portable dependency tree) is supported on Windows and macOS -- the
# broker/receiver/FPGA/writer server stack is Linux-only. Force viewer-only on those platforms so a
# plain configure builds the right subset; on Linux it remains a user-togglable option.
IF (WIN32 OR APPLE)
    SET(JFJOCH_VIEWER_ONLY ON CACHE BOOL "Compile only jfjoch_viewer and its dependencies" FORCE)
ELSE()
    SET(JFJOCH_VIEWER_ONLY OFF CACHE BOOL "Compile only jfjoch_viewer and its dependencies")
ENDIF()

SET (ZLIB_USE_STATIC_LIBS TRUE)

FIND_PACKAGE(ZLIB REQUIRED)

OPTION(SLS9 "Build with sls_detector_package v9.2.0" OFF)

SET(BUILD_SHARED_LIBS OFF)
SET(BUILD_TESTING OFF)

SET(ZSTD_LEGACY_SUPPORT OFF)
SET(ZSTD_MULTITHREAD_SUPPORT OFF)
SET(ZSTD_BUILD_PROGRAMS OFF)
SET(ZSTD_BUILD_SHARED OFF)

SET(SLS_USE_RECEIVER OFF)
SET(SLS_USE_RECEIVER_BINARIES OFF)
SET(SLS_BUILD_SHARED_LIBRARIES OFF)

SET(BUILD_FAST_INDEXER OFF)
SET(BUILD_FAST_INDEXER_STATIC ON)

INCLUDE(CheckLanguage)
INCLUDE(CheckIncludeFile)

# Locate nvcc ourselves when it isn't already pinned (-DCMAKE_CUDA_COMPILER / $CUDACXX). CHECK_LANGUAGE
# below only searches PATH, which is missed routinely on Windows and intermittently on Linux; the
# standard CUDA install locations (CUDA_PATH on Windows, /usr/local/cuda on Linux) cover both, so the
# compiler need not be passed by hand. Only set it when actually found, leaving CHECK_LANGUAGE to run
# its normal detection otherwise.
IF (JFJOCH_USE_CUDA AND NOT CMAKE_CUDA_COMPILER AND NOT DEFINED ENV{CUDACXX})
    FIND_PROGRAM(_jfjoch_nvcc nvcc
            HINTS ENV CUDA_PATH ENV CUDA_HOME ENV CUDA_ROOT /usr/local/cuda /opt/cuda
            PATH_SUFFIXES bin)
    IF (_jfjoch_nvcc)
        SET(CMAKE_CUDA_COMPILER "${_jfjoch_nvcc}")
    ENDIF()
ENDIF()

CHECK_LANGUAGE(CUDA)

SET(CMAKE_CUDA_ARCHITECTURES 75 80 86 89 90 100 120) # T4, A100, RTX A4000, L4
SET(CMAKE_CUDA_STANDARD 20)
SET(CMAKE_CUDA_STANDARD_REQUIRED True)
SET(CMAKE_CUDA_FLAGS_RELEASE "-O3 -lineinfo")
SET(CMAKE_CUDA_RUNTIME_LIBRARY Static)

SET(JFJOCH_CUDA_AVAILABLE OFF)

IF (CMAKE_CUDA_COMPILER)
    IF (JFJOCH_USE_CUDA)
        ENABLE_LANGUAGE(CUDA)
        MESSAGE(STATUS "CUDA VERSION: ${CMAKE_CUDA_COMPILER_VERSION}")
        IF (CMAKE_CUDA_COMPILER_VERSION VERSION_GREATER_EQUAL "12.8")
            FIND_PACKAGE(CUDAToolkit REQUIRED)
            ADD_COMPILE_DEFINITIONS(JFJOCH_USE_CUDA)
            SET(JFJOCH_CUDA_AVAILABLE ON)
            # Blackwell GB10 (DGX Spark) is sm_121, only known to nvcc >= 12.9; add it there so the
            # binary launches natively on Spark (the list above tops out at sm_120 and embeds no PTX).
            IF (CMAKE_CUDA_COMPILER_VERSION VERSION_GREATER_EQUAL "12.9")
                LIST(APPEND CMAKE_CUDA_ARCHITECTURES 121)
            ENDIF()
        ELSE()
            MESSAGE(WARNING "CUDA older than 12.8 not supported")
        ENDIF()
    ELSE()
        MESSAGE(WARNING "CUDA Available, but disabled by user")
    ENDIF()
ENDIF()

INCLUDE_DIRECTORIES(include)

include(FetchContent)

SET(HDF5_ENABLE_SZIP_SUPPORT OFF CACHE BOOL "" FORCE)
SET(HDF5_ENABLE_SZIP_ENCODING OFF CACHE BOOL "" FORCE)
SET(HDF5_BUILD_EXAMPLES OFF CACHE BOOL "" FORCE)
SET(HDF5_BUILD_CPP_LIB OFF CACHE BOOL "" FORCE)
SET(HDF5_ENABLE_ZLIB_SUPPORT ON CACHE BOOL "" FORCE)
SET(HDF5_EXTERNALLY_CONFIGURED 1 CACHE BOOL "" FORCE)

SET(SPDLOG_BUILD_EXAMPLES OFF CACHE BOOL "" FORCE)
SET(SPDLOG_BUILD_TESTS OFF CACHE BOOL "" FORCE)
SET(SPDLOG_BUILD_BENCH OFF CACHE BOOL "" FORCE)
set(SPDLOG_BUILD_SHARED OFF CACHE BOOL "" FORCE)
SET(BUILD_SHARED_LIBS OFF CACHE BOOL "" FORCE)

SET(HTTPLIB_USE_NON_BLOCKING_GETADDRINFO OFF CACHE BOOL "" FORCE)
SET(HTTPLIB_REQUIRE_ZLIB ON CACHE BOOL "" FORCE)

FetchContent_Declare(
        spdlog
        GIT_REPOSITORY https://github.com/gabime/spdlog.git
        GIT_TAG v1.17.0
        EXCLUDE_FROM_ALL
)

FetchContent_Declare(
        zstd
        GIT_REPOSITORY https://github.com/facebook/zstd
        GIT_TAG 794ea1b0afca0f020f4e57b6732332231fb23c70
        SOURCE_SUBDIR build/cmake
        EXCLUDE_FROM_ALL
)

FetchContent_Declare(hdf5
        GIT_REPOSITORY https://github.com/HDFGroup/hdf5/
        GIT_TAG hdf5_2.1.0
        GIT_SHALLOW 1
        EXCLUDE_FROM_ALL)

SET(SLS_DETECTOR_GIT_TAG "8.0.2")
IF(SLS9)
    SET(SLS_DETECTOR_GIT_TAG "9.2.0")
ENDIF()

FetchContent_Declare(
        sls_detector_package
        GIT_REPOSITORY https://github.com/slsdetectorgroup/slsDetectorPackage
        GIT_TAG ${SLS_DETECTOR_GIT_TAG}
        EXCLUDE_FROM_ALL
)

FetchContent_Declare(
        catch2
        GIT_REPOSITORY https://github.com/catchorg/Catch2
        GIT_TAG v3.13.0
        EXCLUDE_FROM_ALL
)

FetchContent_Declare(
        httplib
        GIT_REPOSITORY https://github.com/yhirose/cpp-httplib.git
        GIT_TAG v0.39.0
        EXCLUDE_FROM_ALL
)
# httplib enables Brotli content-encoding whenever it finds system Brotli; we don't use it
# (gzip/zlib is enough for the broker), so disable it to avoid linking libbrotli.
SET(HTTPLIB_USE_BROTLI_IF_AVAILABLE OFF CACHE BOOL "" FORCE)

# httplib auto-enables HTTPS by linking system OpenSSL whenever it finds it. The broker serves
# plain HTTP only (TLS, if ever wanted, is terminated by a front reverse proxy), so disable it --
# otherwise jfjoch_broker would pull in libssl/libcrypto for no reason.
SET(HTTPLIB_USE_OPENSSL_IF_AVAILABLE OFF CACHE BOOL "" FORCE)

# ZeroMQ (libzmq): fetch it here, at the top level, so that THIS project - not
# slsDetectorPackage - controls the version. slsDetectorPackage bundles its own libzmq
# archive, but only populates it behind `if(NOT libzmq_POPULATED)`; by making libzmq
# available before sls below, sls reuses this copy and a single libzmq-static target is
# built (no duplicate target / double-symbol clash). A future viewer-only / Windows build
# (which does not build sls) fetches the same libzmq standalone.
SET(BUILD_SHARED   OFF CACHE BOOL "" FORCE)   # libzmq: static only (matches sls)
SET(BUILD_TESTS    OFF CACHE BOOL "" FORCE)   # libzmq: no test build
SET(WITH_PERF_TOOL OFF CACHE BOOL "" FORCE)   # libzmq: no perf tools
SET(WITH_DOCS      OFF CACHE BOOL "" FORCE)   # libzmq: no docs
SET(ENABLE_CPACK   OFF CACHE BOOL "" FORCE)   # libzmq: no CPack injection
FetchContent_Declare(
        libzmq
        GIT_REPOSITORY https://github.com/zeromq/libzmq.git
        GIT_TAG v4.3.5
        EXCLUDE_FROM_ALL
)

# CMake >= 4.0 (e.g. the 4.x bundled with Visual Studio 2026) makes any
# cmake_minimum_required(VERSION < 3.5) a fatal error. Some fetched dependencies still
# declare such old floors (libzmq: 3.0.2), so raise the policy-version floor for the
# FetchContent subprojects. Ignored (harmless) on CMake < 3.30, which lacks this variable.
SET(CMAKE_POLICY_VERSION_MINIMUM 3.5)

# libzmq must be made available BEFORE sls_detector_package for the override above to take effect.
FetchContent_MakeAvailable(libzmq)
IF (JFJOCH_VIEWER_ONLY)
    # A viewer-only build still needs zstd/hdf5/spdlog/httplib (JFJochReader uses httplib).
    # Only sls_detector_package (detector) and catch2 (tests) are not built here -- and sls
    # in particular does not configure under MSVC -- so skip just those two.
    FetchContent_MakeAvailable(zstd hdf5 spdlog httplib)
ELSE()
    FetchContent_MakeAvailable(zstd sls_detector_package catch2 hdf5 spdlog httplib)
ENDIF()

# libtiff (used by JFJochPreview in every build mode): build it ourselves. Its C++ binding
# (tiffxx) is packaged inconsistently across distros (missing on Rocky 9) and absent on
# Windows. Library only; the SET()s below are libtiff's own codec/tool switches.
# We only need DEFLATE (zlib) + the internal LZW codec, matching what Python tifffile writes
# by default. The remaining codecs default to ON whenever their library is found on the build
# host, so each must be explicitly turned OFF to keep the dependency set minimal -- otherwise
# webp pulls in libwebp + libsharpyuv and lerc pulls in libLerc.
SET(jbig OFF)
SET(zstd OFF)
SET(lzma OFF)
SET(jpeg OFF)
SET(old-jpeg OFF)
SET(webp OFF)
SET(lerc OFF)
SET(tiff-tools OFF)
SET(tiff-tests OFF)
FetchContent_Declare(tiff
        GIT_REPOSITORY https://gitlab.com/libtiff/libtiff.git
        GIT_TAG v4.7.1
        EXCLUDE_FROM_ALL)
FetchContent_MakeAvailable(tiff)

# FFTW single precision (target fftw3f): the CPU fallback indexer, enables JFJOCH_USE_FFTW.
# Built from the release tarball -- the git repo ships no pre-generated codelets (needs the
# OCaml genfft).
SET(ENABLE_FLOAT ON  CACHE BOOL "" FORCE)
SET(BUILD_TESTS  OFF CACHE BOOL "" FORCE)
# SIMD codelets are runtime-dispatched (cpuid), so enabling AVX2 does NOT require an AVX2 CPU
# -- FFTW falls back at runtime. The codelet sets are arch-specific, so guard by processor:
# x86 gets SSE2/AVX/AVX2, aarch64 (e.g. Grace on DGX Spark) gets NEON; other arches build scalar.
IF (CMAKE_SYSTEM_PROCESSOR MATCHES "x86_64|AMD64|amd64")
    SET(ENABLE_SSE2 ON CACHE BOOL "" FORCE)
    SET(ENABLE_AVX  ON CACHE BOOL "" FORCE)
    SET(ENABLE_AVX2 ON CACHE BOOL "" FORCE)
ELSEIF (CMAKE_SYSTEM_PROCESSOR MATCHES "aarch64|arm64|ARM64")
    SET(ENABLE_NEON ON CACHE BOOL "" FORCE)
ENDIF()
FetchContent_Declare(fftw
        URL https://www.fftw.org/fftw-3.3.10.tar.gz
        URL_HASH SHA256=56c932549852cddcfafdab3820b0200c7742675be92179e59e6215b340e26467
        EXCLUDE_FROM_ALL)
FetchContent_MakeAvailable(fftw)
# FFTW exposes fftw3.h only via $<INSTALL_INTERFACE:include>, so consuming fftw3f straight from
# the build tree (FetchContent) leaves the header unreachable. On Linux a system-installed
# fftw3.h masks this; on Windows it does not. Add the source-tree api/ dir for build-tree use.
TARGET_INCLUDE_DIRECTORIES(fftw3f INTERFACE $<BUILD_INTERFACE:${fftw_SOURCE_DIR}/api>)
ADD_COMPILE_DEFINITIONS(JFJOCH_USE_FFTW)

# Eigen is an EXTERNAL dependency (like ZLIB), resolved by find_package(Eigen3) in the subdirectories
# that need it (image_analysis, and transitively Ceres and ffbidx). It is deliberately NOT vendored
# via FetchContent: declaring Eigen with OVERRIDE_FIND_PACKAGE makes the CMake bundled with Visual
# Studio (cmake 4.x "-msvc") intermittently SEGFAULT during configure. The fault is in CMake's own
# FetchContent variable-stack cleanup, reached when Ceres' find_package(Eigen3) resolves the override
# through a nested FetchContent_MakeAvailable -- ~1 in 3 fresh configures, and 100% with Ceres CUDA on.
# Stock Kitware CMake runs the identical scripts fine, so it is a bug in the VS-bundled cmake binary;
# providing Eigen externally avoids that code path entirely and is stable (verified, both Ceres CUDA
# on and off). Provide it via the system package on Linux (eigen3-devel / libeigen3-dev) or a build
# prefix on Windows (point CMAKE_PREFIX_PATH / Eigen3_DIR at it), exactly as for ZLIB.

# getopt/getopt_long shim for Windows: the MSVC CRT has no <getopt.h>. Vendored OpenBSD/NetBSD
# implementation (BSD-licensed). Built only on Windows and defined here, before the subdirectories,
# so the portable CLI tools in tools/ can link it. A no-op on Linux/macOS, where getopt lives in
# libc (macOS uses the system getopt even though it is also a forced viewer-only platform).
IF (WIN32)
    ADD_LIBRARY(wingetopt STATIC tools/wingetopt/getopt.c tools/wingetopt/getopt.h)
    TARGET_INCLUDE_DIRECTORIES(wingetopt PUBLIC tools/wingetopt)
ENDIF()

# libcurl: the jfjoch_viewer HTTP client (viewer/JFJochHttpReader). Fetched and STATICALLY linked
# ONLY for viewer builds, so the broker/writer never pull in a TLS/Kerberos stack. Backends are
# OS-native per platform to keep the Windows build self-contained: Schannel (TLS) + SSPI
# (Negotiate/Kerberos) on Windows -- no external OpenSSL/krb5 -- and system OpenSSL + GSSAPI (krb5)
# on Linux. Trimmed to HTTP(S) only, mirroring the libtiff codec pruning above.
IF (JFJOCH_VIEWER_BUILD OR JFJOCH_VIEWER_ONLY)
    SET(BUILD_CURL_EXE       OFF CACHE BOOL "" FORCE)
    SET(BUILD_SHARED_LIBS    OFF CACHE BOOL "" FORCE)   # static libcurl only, never a shared lib
    SET(BUILD_STATIC_LIBS    ON  CACHE BOOL "" FORCE)
    SET(BUILD_TESTING        OFF CACHE BOOL "" FORCE)
    SET(CURL_DISABLE_INSTALL ON  CACHE BOOL "" FORCE)
    SET(HTTP_ONLY            ON  CACHE BOOL "" FORCE)   # HTTP/HTTPS only; drop FTP/LDAP/SMTP/...
    SET(CURL_USE_LIBPSL      OFF CACHE BOOL "" FORCE)   # avoid the libpsl dependency
    SET(CURL_USE_LIBSSH2     OFF CACHE BOOL "" FORCE)
    SET(CURL_ZLIB            ON  CACHE BOOL "" FORCE)   # reuse the project's ZLIB
    IF (WIN32)
        SET(CURL_USE_SCHANNEL ON CACHE BOOL "" FORCE)  # native Windows TLS (no OpenSSL)
        SET(CURL_USE_SSPI     ON CACHE BOOL "" FORCE)  # native Negotiate/Kerberos (no krb5)
    ELSE()
        SET(CURL_USE_OPENSSL  ON CACHE BOOL "" FORCE)
        SET(CURL_USE_GSSAPI   ON CACHE BOOL "" FORCE)  # Kerberos via system krb5 (needs krb5-dev)
    ENDIF()
    FetchContent_Declare(curl
            GIT_REPOSITORY https://github.com/curl/curl.git
            GIT_TAG curl-8_11_1
            EXCLUDE_FROM_ALL)
    FetchContent_MakeAvailable(curl)
    # The viewer links libcurl_static (curl's concrete static-lib target) directly rather than the
    # CURL::libcurl alias: the alias can be shadowed by a system libcurl (find_package / dependency
    # provider / a distro CURL config), silently linking the OS curl with the wrong TLS/Kerberos
    # backend. libcurl_static is unambiguous; guard that FetchContent actually produced it.
    IF (NOT TARGET libcurl_static)
        MESSAGE(FATAL_ERROR "libcurl_static missing after FetchContent_MakeAvailable(curl) -- "
                            "the vendored static libcurl was not built.")
    ENDIF()
ENDIF()

IF (JFJOCH_VIEWER_ONLY)
    # Minimal subtree: jfjoch_viewer and only the libraries it transitively links.
    # (broker here provides JFJochAPI only; its service targets are gated out.)
    ADD_SUBDIRECTORY(jungfrau)
    ADD_SUBDIRECTORY(compression)
    ADD_SUBDIRECTORY(common)
    ADD_SUBDIRECTORY(gemmi_gph)
    ADD_SUBDIRECTORY(frame_serialize)
    ADD_SUBDIRECTORY(preview)
    ADD_SUBDIRECTORY(writer)
    ADD_SUBDIRECTORY(image_analysis)
    ADD_SUBDIRECTORY(broker)
    ADD_SUBDIRECTORY(reader)
    ADD_SUBDIRECTORY(rugnux)
    ADD_SUBDIRECTORY(viewer)
    ADD_SUBDIRECTORY(tools)   # builds only the portable analysis tools (rugnux/extract_hkl)
ELSE()
    ADD_SUBDIRECTORY(jungfrau)
    ADD_SUBDIRECTORY(compression)
    ADD_SUBDIRECTORY(common)
    ADD_SUBDIRECTORY(writer)
    ADD_SUBDIRECTORY(frame_serialize)
    ADD_SUBDIRECTORY(reader)
    ADD_SUBDIRECTORY(detector_control)
    ADD_SUBDIRECTORY(image_puller)
    ADD_SUBDIRECTORY(preview)
    ADD_SUBDIRECTORY(gemmi_gph)
    ADD_SUBDIRECTORY(xds-plugin)

    IF (JFJOCH_WRITER_ONLY)
        MESSAGE(STATUS "Compiling HDF5 writer only")
    ELSE()
        ADD_SUBDIRECTORY(image_pusher)
        ADD_SUBDIRECTORY(broker)
        ADD_SUBDIRECTORY(fpga)
        ADD_SUBDIRECTORY(acquisition_device)
        ADD_SUBDIRECTORY(receiver)
        ADD_SUBDIRECTORY(image_analysis)
        ADD_SUBDIRECTORY(rugnux)
        ADD_SUBDIRECTORY(tests)
        ADD_SUBDIRECTORY(tools)
    ENDIF()

    IF (JFJOCH_VIEWER_BUILD)
        ADD_SUBDIRECTORY(viewer)
    ENDIF()
ENDIF()

IF (NOT JFJOCH_WRITER_ONLY AND NOT JFJOCH_VIEWER_ONLY)
    ADD_CUSTOM_COMMAND(OUTPUT frontend/dist/index.html
            COMMAND npm ci
            COMMAND npm run build
            COMMAND npm run licenses        # write dist/THIRD_PARTY_LICENSES.txt (npm deps attribution)
            COMMAND npm run redocly
            COMMAND npm run docs            # bundle Sphinx docs into dist/docs (served at /frontend/docs)
            WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}/frontend)
    ADD_CUSTOM_TARGET(frontend DEPENDS frontend/dist/index.html)

    ADD_CUSTOM_TARGET(update_version
            COMMAND bash update_version.sh
            WORKING_DIRECTORY ${CMAKE_SOURCE_DIR})

    IF (JFJOCH_INSTALL_DRIVER_SOURCE)
        INSTALL(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/fpga/pcie_driver/
                DESTINATION /usr/src/jfjoch-${JFJOCH_VERSION}
                COMPONENT driver-dkms
                FILES_MATCHING PATTERN "dkms.conf")

        INSTALL(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/fpga/pcie_driver/
                DESTINATION /usr/src/jfjoch-${JFJOCH_VERSION}/src
                COMPONENT driver-dkms
                FILES_MATCHING PATTERN "*.c" PATTERN "*.h" PATTERN "Makefile")
    ENDIF()
    FILE(MAKE_DIRECTORY ${CMAKE_SOURCE_DIR}/frontend/dist/)
    INSTALL(DIRECTORY ${CMAKE_SOURCE_DIR}/frontend/dist/ DESTINATION share/jfjoch/frontend COMPONENT jfjoch )
ENDIF()

IF(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
    SET(CMAKE_INSTALL_PREFIX /opt/jfjoch CACHE PATH "Default directory" FORCE)
ENDIF(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)

# Set Package Name
SET(CPACK_PACKAGE_NAME "jfjoch")

# Select the components to package based on build mode
if (JFJOCH_VIEWER_ONLY)
    set(CPACK_COMPONENTS_ALL viewer)
else()
    set(CPACK_COMPONENTS_ALL jfjoch writer)
    if (JFJOCH_INSTALL_DRIVER_SOURCE)
        list(APPEND CPACK_COMPONENTS_ALL driver-dkms)
    endif()
    if (JFJOCH_VIEWER_BUILD)
        list(APPEND CPACK_COMPONENTS_ALL viewer)
    endif()
endif()

# Common metadata
set(CPACK_PACKAGE_CONTACT "Filip Leonarski <filip.leonarski@psi.ch>")
set(CPACK_PACKAGE_VENDOR "Paul Scherrer Institut")
set(CPACK_PACKAGE_VERSION ${JFJOCH_VERSION})

# OS-aware packaging: DragNDrop (.dmg) on macOS, NSIS installer on Windows, DEB on Debian/Ubuntu,
# RPM on RHEL/Rocky. macOS/Windows are checked first because the /etc/* probes below are Linux-only.
if (APPLE)
    # .dmg containing jfjoch_viewer.app (Qt runtime already deployed into the bundle).
    set(CPACK_GENERATOR "DragNDrop")
elseif (WIN32)
    # NSIS installer .exe (Qt runtime deployed next to the binary by windeployqt).
    set(CPACK_GENERATOR "NSIS")

    # GPLv3 text shown as the click-through license page of the installer.
    set(CPACK_RESOURCE_FILE_LICENSE "${CMAKE_SOURCE_DIR}/LICENSE")

    # Branding is split across three CPack knobs so the CUDA/CPU variant surfaces exactly where we
    # want it and nowhere else:
    #   - Install folder + Start Menu group come from CPACK_PACKAGE_INSTALL_DIRECTORY and
    #     CPACK_NSIS_PACKAGE_NAME (the latter feeds $(^Name), the Start Menu group's default folder).
    #     Both stay plain "Jungfraujoch", so the Start Menu group carries no variant tag and the two
    #     builds install to the same place (CUDA is a strict superset -- they replace, not coexist).
    #   - CPACK_NSIS_DISPLAY_NAME is the Add/Remove Programs entry -- tagged "(CUDA)"/"(CPU)".
    #   - CPACK_PACKAGE_FILE_NAME is the installer .exe filename -- tagged "-cuda<major>"/"-cpu", so
    #     the (much larger) CUDA download is self-identifying, with the CUDA major version baked in.
    # The tag follows JFJOCH_CUDA_AVAILABLE automatically; CUDAToolkit_VERSION_MAJOR is set whenever
    # it is ON (find_package(CUDAToolkit) ran in the same guard above).
    set(CPACK_PACKAGE_INSTALL_DIRECTORY "Jungfraujoch")
    set(CPACK_NSIS_PACKAGE_NAME "Jungfraujoch")
    if (JFJOCH_CUDA_AVAILABLE)
        set(CPACK_NSIS_DISPLAY_NAME "Jungfraujoch (CUDA)")
        set(CPACK_PACKAGE_FILE_NAME "jfjoch-viewer-${JFJOCH_VERSION}-win64-cuda${CUDAToolkit_VERSION_MAJOR}")
    else()
        set(CPACK_NSIS_DISPLAY_NAME "Jungfraujoch (CPU)")
        set(CPACK_PACKAGE_FILE_NAME "jfjoch-viewer-${JFJOCH_VERSION}-win64-cpu")
    endif()

    # Start Menu shortcut for the viewer ("<exe basename>;<label>"). The shortcut and the
    # Add/Remove Programs entry both use the .exe's embedded icon.
    set(CPACK_PACKAGE_EXECUTABLES "jfjoch_viewer;Jungfraujoch Viewer")
    # Forward slash on purpose: CPack writes this value verbatim into CPackConfig.cmake, and a
    # backslash there ("bin\jfjoch...") is an invalid escape that cmake 4.x (CMP0010 strict, e.g. the
    # VS-bundled cmake) rejects when cpack re-parses it. Windows accepts the forward slash at runtime.
    set(CPACK_NSIS_INSTALLED_ICON_NAME "bin/jfjoch_viewer.exe")
elseif (JFJOCH_VIEWER_ONLY)
    # Linux portable viewer: a single self-contained .tar.gz of jfjoch_viewer (Qt is linked
    # statically here, so there is nothing external to ship alongside the binary). Built on the
    # oldest supported distro (RHEL 8) for a low glibc floor, so the archive runs on any newer
    # Linux -- unlike the per-distro .rpm/.deb this is meant to replace in the release. Named to
    # mirror the Windows/macOS artifacts, with the same -cuda<major>/-cpu tag so the (larger) GPU
    # build is self-identifying. CI renames the .tar.gz to .tgz before upload.
    set(CPACK_GENERATOR "TGZ")
    # Package only the components in CPACK_COMPONENTS_ALL (here: viewer). Without this the archive
    # generator falls back to a monolithic install and walks every install() rule in the tree --
    # including the fetched HDF5 command-line tools, abseil's EXCLUDE_FROM_ALL sub-libraries and the
    # non-viewer components -- none of which the viewer-only build produces, so cpack aborts with
    # "cannot find <artifact>". ALL_COMPONENTS_IN_ONE keeps the output a single tarball named
    # CPACK_PACKAGE_FILE_NAME (no per-component suffix), matching the CI upload glob. This mirrors
    # CPACK_DEB_COMPONENT_INSTALL / CPACK_RPM_COMPONENT_INSTALL in the DEB/RPM branches below.
    set(CPACK_ARCHIVE_COMPONENT_INSTALL ON)
    set(CPACK_COMPONENTS_GROUPING ALL_COMPONENTS_IN_ONE)
    if (JFJOCH_CUDA_AVAILABLE)
        set(CPACK_PACKAGE_FILE_NAME "jfjoch_viewer-${JFJOCH_VERSION}-linux-cuda${CUDAToolkit_VERSION_MAJOR}")
    else()
        set(CPACK_PACKAGE_FILE_NAME "jfjoch_viewer-${JFJOCH_VERSION}-linux-cpu")
    endif()
elseif (EXISTS "/etc/debian_version")
    set(CPACK_PACKAGE_LICENSE "GPL-3.0-only")
    set(CPACK_RESOURCE_FILE_LICENSE "${CMAKE_SOURCE_DIR}/LICENSE")

    # Debian/Ubuntu: .deb with components
    set(CPACK_GENERATOR "DEB")
    set(CPACK_DEB_COMPONENT_INSTALL ON)
    set(CPACK_DEBIAN_MAIN_COMPONENT broker)
    set(CPACK_DEBIAN_FILE_NAME "DEB-DEFAULT")

    # Enable automatic shlib dependency discovery
    set(CPACK_DEBIAN_PACKAGE_SHLIBDEPS ON)

    # Optional DEB metadata (tune as needed)
    set(CPACK_DEBIAN_PACKAGE_SECTION "science")
    # set(CPACK_DEBIAN_PACKAGE_HOMEPAGE "https://example.org/jfjoch")

    # DKMS component (maps from RPM settings)
    if (JFJOCH_INSTALL_DRIVER_SOURCE)
        # Dependencies and arch for the DKMS component
        # Note: component name "driver-dkms" maps to variable suffix "DRIVER_DKMS"
        set(CPACK_DEBIAN_DRIVER_DKMS_PACKAGE_DEPENDS "dkms, gcc, bash, sed")
        set(CPACK_DEBIAN_DRIVER_DKMS_PACKAGE_ARCHITECTURE "all")

        # Provide Debian control scripts (postinst/prerm).
        # We rename existing scripts to Debian control names at configure time.
        set(_dkms_ctrl_dir "${CMAKE_CURRENT_BINARY_DIR}/cpack-debian-driver-dkms")
        file(MAKE_DIRECTORY "${_dkms_ctrl_dir}")
        configure_file(${CMAKE_CURRENT_SOURCE_DIR}/fpga/pcie_driver/postinstall.sh
                ${_dkms_ctrl_dir}/postinst COPYONLY)
        configure_file(${CMAKE_CURRENT_SOURCE_DIR}/fpga/pcie_driver/preuninstall.sh
                ${_dkms_ctrl_dir}/prerm COPYONLY)
        set(CPACK_DEBIAN_DRIVER_DKMS_PACKAGE_CONTROL_EXTRA
                "${_dkms_ctrl_dir}/postinst;${_dkms_ctrl_dir}/prerm")
    endif()

elseif (EXISTS "/etc/redhat-release")
    # RHEL/Rocky: .rpm with components (original behavior)
    set(CPACK_GENERATOR "RPM")
    set(CPACK_RPM_COMPONENT_INSTALL ON)
    set(CPACK_RPM_MAIN_COMPONENT jfjoch)
    set(CPACK_RPM_PACKAGE_RELEASE_DIST ON)
    set(CPACK_RPM_FILE_NAME "RPM-DEFAULT")
    set(CPACK_RPM_PACKAGE_VERSION ${JFJOCH_VERSION})
    set(CPACK_RPM_PACKAGE_RELEASE 1)
    set(CPACK_RPM_PACKAGE_SUMMARY "Jungfraujoch data acquisition system")
    set(CPACK_RPM_PACKAGE_DESCRIPTION "Jungfraujoch")
    set(CPACK_RPM_PACKAGE_LICENSE "GPLv3")
    set(CPACK_RPM_EXCLUDE_FROM_AUTO_FILELIST_ADDITION
            /usr/src /usr/share /usr/share/dbus-1 /usr/share/dbus-1/services /usr/share/pixmaps /usr/share/applications)

    # DKMS component scripts and requirements for RPM
    if (JFJOCH_INSTALL_DRIVER_SOURCE)
        set(CPACK_RPM_DRIVER-DKMS_PACKAGE_REQUIRES "dkms, gcc, bash, sed")
        set(CPACK_RPM_DRIVER-DKMS_PACKAGE_ARCHITECTURE "noarch")
        set(CPACK_RPM_DRIVER-DKMS_POST_INSTALL_SCRIPT_FILE
                ${CMAKE_CURRENT_SOURCE_DIR}/fpga/pcie_driver/postinstall.sh)
        set(CPACK_RPM_DRIVER-DKMS_PRE_UNINSTALL_SCRIPT_FILE
                ${CMAKE_CURRENT_SOURCE_DIR}/fpga/pcie_driver/preuninstall.sh)
    endif()
else()
    # Fallback if OS is unknown
    set(CPACK_GENERATOR "TGZ")
endif()


# Ship the license notices (top-level LICENSE, the third-party manifest, and the verbatim
# license texts) with every package variant, under share/doc/jfjoch. Installed per component so
# the file lands in whichever component package(s) the current build mode produces.
SET(JFJOCH_NOTICE_FILES
        ${CMAKE_SOURCE_DIR}/LICENSE
        ${CMAKE_SOURCE_DIR}/THIRD_PARTY_NOTICES.md)
FOREACH(_component IN LISTS CPACK_COMPONENTS_ALL)
    INSTALL(FILES ${JFJOCH_NOTICE_FILES}
            DESTINATION share/doc/jfjoch COMPONENT ${_component})
    INSTALL(DIRECTORY ${CMAKE_SOURCE_DIR}/licenses/
            DESTINATION share/doc/jfjoch/licenses COMPONENT ${_component}
            PATTERN "COLLECT.sh" EXCLUDE)
ENDFOREACH()

INCLUDE(CPack)