# -*- coding: utf-8; mode: tcl; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- vim:fenc=utf-8:ft=tcl:et:sw=4:ts=4:sts=4

PortSystem              1.0
PortGroup select        1.0
PortGroup compiler_blacklist_versions 1.0
PortGroup active_variants 1.1
PortGroup cmake         1.0

set llvm_version        10
set llvm_version_no_dot 10
set clang_executable_version 10
set lldb_executable_version 10
name                    llvm-${llvm_version}
revision                3
subport                 clang-${llvm_version} { revision 8 }
subport                 lldb-${llvm_version} { revision 4 }
set suffix              mp-${llvm_version}
set sub_prefix          ${prefix}/libexec/llvm-${llvm_version}
dist_subdir             llvm
categories              lang
platforms               {darwin < 23}
license                 NCSA
maintainers             {jeremyhu @jeremyhu}

if {${subport} eq "llvm-${llvm_version}"} {
    homepage            https://llvm.org/
    description         llvm is a next generation compiler infrastructure
    long_description    The LLVM Core libraries provide a modern source- and \
                        target-independent optimizer, along with code \
                        generation support for many popular CPUs (as well as \
                        some less common ones!) These libraries are built \
                        around a well specified code representation known as \
                        the LLVM intermediate representation ("LLVM IR").

    depends_lib         port:libedit port:libffi port:ncurses path:lib/libxar.dylib:xar port:zlib
    depends_run         bin:perl:perl5 port:llvm_select
} elseif {${subport} eq "clang-${llvm_version}"} {
    homepage            https://clang.llvm.org/
    description         C, C++, Objective C and Objective C++ compiler
    long_description    Clang is an "LLVM native" C/C++/Objective-C compiler, \
                        which aims to deliver amazingly fast compiles (e.g. \
                        about 3x faster than GCC when compiling Objective-C \
                        code in a debug configuration), extremely useful error \
                        and warning messages and to provide a platform for \
                        building great source level tools. The included Clang \
                        Static Analyzer is a tool that automatically finds bugs in \
                        your code, and is a great example of the sort of tool \
                        that can be built using the Clang frontend as a \
                        library to parse C/C++ code.

    depends_lib         port:libxml2 port:libomp port:llvm-${llvm_version}
    depends_run         port:clang_select port:ld64
    depends_skip_archcheck-append ld64 subversion

    # Older Xcode's ranlib doesn't understand objects produced by newer clang (malformed object (unknown load command 2))
    # https://trac.macports.org/ticket/57412
    if {[vercmp $xcodeversion "6.0.0"] < 0} {
        depends_run-append port:cctools
        depends_skip_archcheck-append cctools
    }

    # Avoid requiring a bootstrap version of perl5 on 10.6.
    if {${os.major} >= 11} {
        default_variants    +analyzer
    }

} elseif {${subport} eq "lldb-${llvm_version}"} {
    homepage            https://lldb.llvm.org/
    description         the LLVM debugger
    long_description    Lldb is the "LLVM native" debugger.

    depends_lib         port:libxml2 port:libomp port:llvm-${llvm_version} port:ncurses
    depends_build-append port:swig-python path:bin/doxygen:doxygen
    depends_run-append  port:lldb_select

    select.group        lldb
    select.file         ${filespath}/mp-${subport}
}

# the backtik pkgconfig setting in the ffi config line requires pkg-config
depends_build-append    port:pkgconfig

version                 ${llvm_version}.0.1
master_sites            https://github.com/llvm/llvm-project/releases/download/llvmorg-${version}
use_xz                  yes
extract.suffix          .tar.xz
distfiles               llvm-${version}.src${extract.suffix}
worksrcdir              llvm-${version}.src

if {${distfiles} ne ""} {
    if {${subport} eq "llvm-${llvm_version}"} {
        if {[variant_isset polly]} {
            distfiles-append     polly-${version}.src${extract.suffix}
        }
    } elseif {${subport} eq "clang-${llvm_version}"} {
        distfiles-append     clang-${version}.src${extract.suffix} compiler-rt-${version}.src${extract.suffix} libcxx-${version}.src${extract.suffix} clang-tools-extra-${version}.src${extract.suffix}
    } elseif {${subport} eq "lldb-${llvm_version}"} {
        distfiles-append     clang-${version}.src${extract.suffix} lldb-${version}.src${extract.suffix}
    }
}

checksums           llvm-10.0.1.src.tar.xz \
                    rmd160  24ace1b46825972c77484a3e31401344c59cff46 \
                    sha256  c5d8e30b57cbded7128d78e5e8dad811bff97a8d471896812f57fa99ee82cdf3 \
                    size    35270168 \
                    clang-10.0.1.src.tar.xz \
                    rmd160  15b8a3b6c6f1a2896146006b30fbcf104be7c2b6 \
                    sha256  f99afc382b88e622c689b6d96cadfa6241ef55dca90e87fc170352e12ddb2b24 \
                    size    14046188 \
                    compiler-rt-10.0.1.src.tar.xz \
                    rmd160  7912cb7c636894f0682b91d04ea0dfe512f01124 \
                    sha256  d90dc8e121ca0271f0fd3d639d135bfaa4b6ed41e67bd6eb77808f72629658fa \
                    size    2085712 \
                    libcxx-10.0.1.src.tar.xz \
                    rmd160  b8aca0058eb455a37b5e91e40d3f99b56fc058ae \
                    sha256  def674535f22f83131353b3c382ccebfef4ba6a35c488bdb76f10b68b25be86c \
                    size    1839172 \
                    clang-tools-extra-10.0.1.src.tar.xz \
                    rmd160  267c7495887ed838c16524a20ba61b3981ce9f16 \
                    sha256  d093782bcfcd0c3f496b67a5c2c997ab4b85816b62a7dd5b27026634ccf5c11a \
                    size    2599404 \
                    lldb-10.0.1.src.tar.xz \
                    rmd160  59442a4685c7c6c2468477ce16fa09e4fef8540d \
                    sha256  07abe87c25876aa306e73127330f5f37d270b6b082d50cc679e31b4fc02a3714 \
                    size    9632124 \
                    polly-10.0.1.src.tar.xz \
                    rmd160  7817ef68cf42d7073f635b149b7dfcaa3bbbc83c \
                    sha256  d2fb0bb86b21db1f52402ba231da7c119c35c21dfb843c9496fe901f2d6aa25a \
                    size    8894312

patch.pre_args-replace  -p0 -p1
patchfiles \
    0001-Set-the-Mach-O-CPU-Subtype-to-ppc7400-when-targeting.patch \
    0002-Define-EXC_MASK_CRASH-and-MACH_EXCEPTION_CODES-if-th.patch \
    0003-MacPorts-Only-Don-t-embed-the-deployment-target-in-t.patch \
    0004-Fix-build-issues-pre-Lion-due-to-missing-a-strnlen-d.patch \
    0005-Threading-Only-call-pthread_setname_np-on-SnowLeopar.patch \
    0006-Only-call-setpriority-PRIO_DARWIN_THREAD-0-PRIO_DARW.patch

patchfiles-append \
    5000-patch-llvm8-tools-dsymutil-symbolmap-use-older-cfname-and-fix-uuid-on-leopard.diff \
    5000-patch-lib-support-unix-path-copyfileclone-on-older-systems.diff \
    5001-patch-machoreader-strnlen.diff \
    5002-patch-objdumper-strnlen.diff \
    5003-patch-llvm10-strnlen.diff

if {${subport} eq "clang-${llvm_version}"} {
    patchfiles-append \
        1001-MacPorts-Only-Prepare-clang-format-for-replacement-w.patch \
        1002-MacPorts-Only-Fix-name-of-scan-view-executable-insid.patch \
        1003-Default-to-ppc7400-for-OSX-10.5.patch \
        1004-Default-to-fragile-ObjC-runtime-when-targeting-darwi.patch \
        1005-Fixup-libstdc-header-search-paths-for-older-versions.patch \
        1006-Fix-build-issues-pre-Lion-due-to-missing-a-strnlen-d.patch \
        1007-Fix-float.h-to-work-on-Snow-Leopard-and-earlier.patch \
        2001-xray-Define-O_CLOEXEC-for-older-SDKs-that-don-t-have.patch \
        2002-Work-around-no-libdispatch-on-10.6.patch \
        2003-patch-compiler-rt-support-arm64.diff \
        3001-Fix-missing-long-long-math-prototypes-when-using-the.patch \
        3002-implement-atomic-using-mutex-lock_guard-for-64b-ops-.patch \
        openmp-locations.patch \
        leopard-no-asan.patch

    patchfiles-append \
        5000-patch-compilerrtdarwinutils-find-macosxsdkversion.diff \
        5001-patch-libcxx-src-new-posix-memalign-leopard.diff \
        5002-patch-toolchains-darwin-add-back-pre-10.6-link-libs.diff

    # Understand deployment target of 11.x on Big Sur
    # https://trac.macports.org/ticket/61525
    patchfiles-append clang-driver-support-11.x-target.diff

    # fix incorrect disabling of bad_optional/variant/any_access on 10.13
    # https://github.com/macports/macports-base/pull/179
    patchfiles-append patch-libcxx-includes-config-optional-1013.diff

    # https://reviews.llvm.org/D89001
    patchfiles-append patch-clang-fix-include-next-sysroot-cpp-headers.diff

}

if {${subport} eq "lldb-${llvm_version}"} {
    # lldb needs the clang sources present, so we apply the applicable patches.
    patchfiles-append \
        1001-MacPorts-Only-Prepare-clang-format-for-replacement-w.patch \
        1002-MacPorts-Only-Fix-name-of-scan-view-executable-insid.patch \
        1003-Default-to-ppc7400-for-OSX-10.5.patch \
        1004-Default-to-fragile-ObjC-runtime-when-targeting-darwi.patch \
        1005-Fixup-libstdc-header-search-paths-for-older-versions.patch \
        1006-Fix-build-issues-pre-Lion-due-to-missing-a-strnlen-d.patch \
        1007-Fix-float.h-to-work-on-Snow-Leopard-and-earlier.patch \
        openmp-locations.patch \
        clang-driver-support-11.x-target.diff \
        patch-lldb-ObjectFileMachO.cpp-iterator.diff
}

configure.post_args         ../${worksrcdir}
default configure.dir       {${workpath}/build}
default build.dir           {${workpath}/build}

cmake.install_prefix ${sub_prefix}

# clang shared libraries are not all installed in ${cmake.install_prefix}/lib
# so we have to let the llvm/clang cmake scripts handle the @rpath setting
# See:
#     https://llvm.org/bugs/show_bug.cgi?id=31425
#     https://trac.macports.org/ticket/53299
configure.args-delete \
    -DCMAKE_INSTALL_NAME_DIR=${cmake.install_prefix}/lib \
    -DCMAKE_INSTALL_RPATH=${cmake.install_prefix}/lib

configure.args-replace \
    -DCMAKE_SYSTEM_PREFIX_PATH="${prefix}\;/usr" \
    -DCMAKE_SYSTEM_PREFIX_PATH="${cmake.install_prefix}\;${prefix}\;/usr"

configure.args-append \
    -DLLVM_LINK_LLVM_DYLIB=ON \
    -DLLVM_ENABLE_ASSERTIONS=OFF \
    -DLLVM_ENABLE_RTTI=ON \
    -DLLVM_INCLUDE_TESTS=OFF \
    -DLLVM_INCLUDE_EXAMPLES=OFF \
    -DLLVM_ENABLE_FFI=ON \
    -DLLVM_BINDINGS_LIST=none \
    -DFFI_INCLUDE_DIR=`pkg-config --cflags-only-I libffi | sed 's/-I//'` \
    -DFFI_LIBRARY_DIR=${prefix}/lib

if {${subport} eq "llvm-${llvm_version}"} {
    select.group        llvm
    select.file         ${filespath}/mp-${subport}
} elseif {${subport} eq "clang-${llvm_version}"} {
    select.group        clang
    select.file         ${filespath}/mp-${subport}

    # CMAKE_LINKER is used to determine the value for HOST_LINK_VERSION
    configure.args-append \
        -DCMAKE_LINKER=${prefix}/bin/ld \
        -DCLANG_INCLUDE_TESTS=OFF \
        -DCLANG_ENABLE_STATIC_ANALYZER=OFF \
        -DCLANG_ENABLE_ARCMT=OFF \
        -DDARWIN_PREFER_PUBLIC_SDK=ON \
        -DLLVM_BUILD_RUNTIME=ON \
        -DLIBCXX_ENABLE_SHARED=OFF \
        -DLIBCXX_INSTALL_LIBRARY=OFF

} elseif {${subport} eq "lldb-${llvm_version}"} {
    #select.group        lldb
    #select.file         ${filespath}/mp-${subport}

    configure.args-append \
        -DLLDB_CODESIGN_IDENTITY=- \
        -DCLANG_ENABLE_ARCMT=OFF \
        -DCLANG_INCLUDE_TESTS=OFF \
        -DCLANG_ENABLE_STATIC_ANALYZER=OFF \
        -DLLVM_BUILD_RUNTIME=ON \
        -DLIBCXX_ENABLE_SHARED=OFF \
        -DLIBCXX_INSTALL_LIBRARY=OFF
}

# not building with macports-clang up to 3.7 or xcode clang up to 800.0.42.1
# error: no type named 'type' in 'std::__1::enable_if<false, void>'; 'enable_if' cannot be used to disable this declaration
#                 ,typename enable_if<is_convertible<const _U1&, _T1>::value &&
#                                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
compiler.blacklist *gcc* {clang < 801} macports-clang-3.*

# Override the normal compiler fallback list entirely since we have
# such specific requirements.
compiler.fallback   clang

# fall back to clang-9.0 when system clang is too old
# clang-9.0 was that last one that built with clang-3.7
compiler.fallback-append macports-clang-9.0

# cctools is needed to handle objects from newer clang toolchains
if {[string match macports-clang-* ${configure.compiler}]} {
    depends_build-append port:cctools
    depends_skip_archcheck-append cctools
}

if {${os.major} <= 14} {
    # compiler-rt does a broad search for an SDK it likes, but this
    # search fails on older systems that don't have a MacOSX.sdk
    # TODO: apply this always to all systems?
    if {${configure.sdkroot} eq ""} {set configure.sdkroot "/"}
    configure.args-append -DDARWIN_osx_SYSROOT="${configure.sdkroot}"
}

# Set CMAKE_LIBTOOL if we're using MacPorts-provided cctools
if {[lsearch -exact $PortInfo(depends_build) port:cctools] != -1} {
    configure.args-append \
        -DCMAKE_LIBTOOL=${prefix}/bin/libtool
}

# use the system python27 if present
if {${os.platform} eq "darwin" && ${os.major} >= 21} {
    set pythonfullpath   /usr/bin/python3
} elseif {${os.platform} eq "darwin" && ${os.major} >= 11} {
    set pythonfullpath   /usr/bin/python2.7
} else {
    set pythonfullpath   ${prefix}/bin/python2.7
    depends_lib-append   port:python27
}
configure.args-append   -DPYTHON_EXECUTABLE=${pythonfullpath}

platform darwin {
    # Note that we are forcing this choice.  This means that anything linking
    # against llvm-3.5 needs to also be using libc++.  This is possibly
    # problematic, but luckily there is just a limited set of such dependents.

    configure.cxx_stdlib libc++
    depends_lib-append port:libcxx
    supported_archs i386 x86_64 arm64

    pre-fetch {
        if {${os.major} < 11} {
            if {![file exists /usr/lib/libc++.dylib]} {
                ui_error "$name requires a C++11 runtime, which your configuration does not allow"
                error "unsupported configuration"
            }
        }
    }
}

variant assertions description "Enable assertions for error detection (has performance impacts, especially on JIT)" {
    configure.args-delete -DLLVM_ENABLE_ASSERTIONS=OFF
    configure.args-append -DLLVM_ENABLE_ASSERTIONS=ON
}

platform darwin {

    if {${subport} eq "clang-${llvm_version}"} {

        if {${os.major} <= 18} {
            # on systems that might build i386, we need atomic builtins
            # https://trac.macports.org/ticket/58712
            configure.args-append    -DCOMPILER_RT_EXCLUDE_ATOMIC_BUILTIN=OFF
        }

        if {${os.major} <= 15} {
            # XRAY uses TLS, MAP_ANONYMOUS, and clock_gettime, so disable it
            # on systems that don't currently support these features
            # see https://trac.macports.org/ticket/57130
            # https://bugs.llvm.org/show_bug.cgi?id=38959
            # https://bugs.llvm.org/show_bug.cgi?id=38958
            # TO DO: all these features can be replaced by legacysupport
            configure.args-append    -DCOMPILER_RT_BUILD_XRAY=OFF
        }

        if {${os.major} <= 14} {
            configure.args-append    -DCLANG_ENABLE_CLANGD=OFF
        }

        if {${os.major} <= 13} {
            # We unfortunately don't have an option to just turn off tsan
            # https://llvm.org/bugs/show_bug.cgi?id=27715
            configure.args-append    -DCOMPILER_RT_BUILD_SANITIZERS=OFF

            # libfuzzer uses TLS, fails on 10.9 and less
            # possibly fixable, see https://trac.macports.org/ticket/58291
            # TO DO: TLS is available by using a macports-clang compiler
            configure.args-append    -DCOMPILER_RT_BUILD_LIBFUZZER=OFF
        }

        if {${os.major} <= 10} {
            # the directorywatcher code in clang-9.0+ is 10.7+
            # I believe this patch could be applied always, without a system test
            patchfiles-append 5003-patch-no-directory-watcher-on-snowleopard.diff

            # the libcxx installed by MacPorts on darwin 10 and less does not correspond to Apple's builtin libcxx
            patchfiles-append 5005-MacPorts-only-patch-libcxx-includes-disable-availability-tests.diff
        }

        if {${os.major} <= 9} {
            # TO DO: the blocks functionality can be replaced by libblocksruntime
            # this might be integrated into clang on < 10.6
            patchfiles-append leopard-no-blocks.patch
        }
    }

    if {${os.major} < 11} {
        # Proxy for eliminating the dependency on native TLS
        # http://trac.macports.org/ticket/46887
        configure.args-append -DLLVM_ENABLE_BACKTRACES=OFF

        # https://llvm.org/bugs/show_bug.cgi?id=25680
        configure.cxxflags-append -U__STRICT_ANSI__
    }
}

if {${subport} eq "lldb-${llvm_version}"} {
    platforms {darwin >= 15} {darwin < 23}
}

post-extract {
    if {${subport} eq "llvm-${llvm_version}"} {
        if {[variant_isset polly]} {
            file rename ${workpath}/polly-${version}.src         ${worksrcpath}/tools/polly
        }
    } elseif {${subport} eq "clang-${llvm_version}"} {
        file rename ${workpath}/clang-${version}.src             ${worksrcpath}/tools/clang
        file rename ${workpath}/compiler-rt-${version}.src       ${worksrcpath}/projects/compiler-rt
        file rename ${workpath}/libcxx-${version}.src            ${worksrcpath}/projects/libcxx
        file rename ${workpath}/clang-tools-extra-${version}.src ${worksrcpath}/tools/clang/tools/extra
    } elseif {${subport} eq "lldb-${llvm_version}"} {
        file rename ${workpath}/clang-${version}.src             ${worksrcpath}/tools/clang
        file rename ${workpath}/lldb-${version}.src              ${worksrcpath}/tools/lldb
    }
}

if {${subport} eq "clang-${llvm_version}"} {
    destroot {
        system "cd ${destroot.dir}/tools/clang && ${destroot.cmd} ${destroot.pre_args} ${destroot.target} ${destroot.post_args}"
        system "cd ${destroot.dir}/projects/compiler-rt && ${destroot.cmd} ${destroot.pre_args} ${destroot.target} ${destroot.post_args}"
        system "cd ${destroot.dir}/projects/libcxx && ${destroot.cmd} ${destroot.pre_args} ${destroot.target} ${destroot.post_args}"

        delete ${destroot}${sub_prefix}/bin/clang
        file rename ${destroot}${sub_prefix}/bin/clang-${clang_executable_version} ${destroot}${sub_prefix}/bin/clang
        reinplace "s|/bin/clang-${clang_executable_version}|/bin/clang|g" \
            "${destroot}${sub_prefix}/lib/cmake/clang/ClangTargets-release.cmake"
    }
}

if {${subport} eq "lldb-${llvm_version}"} {
    post-patch {
        reinplace "s|@@PREFIX@@|${prefix}|" \
            ${worksrcpath}/tools/clang/lib/Driver/ToolChains/Clang.cpp \
            ${worksrcpath}/tools/clang/lib/Driver/ToolChains/CommonArgs.cpp

        reinplace "s|@CLANG_FORMAT_PATH@|${prefix}/bin/clang-format-${suffix}|g" \
            ${worksrcpath}/tools/clang/tools/clang-format/clang-format-bbedit.applescript \
            ${worksrcpath}/tools/clang/tools/clang-format/clang-format-diff.py            \
            ${worksrcpath}/tools/clang/tools/clang-format/clang-format-sublime.py         \
            ${worksrcpath}/tools/clang/tools/clang-format/clang-format.el                 \
            ${worksrcpath}/tools/clang/tools/clang-format/clang-format.py
    }

    build.dir   ${build.dir}/tools/lldb

    notes "Please follow the instructions at https://lldb.llvm.org/resources/build.html#code-signing-on-macos and then codesign lldb-server with:\n--------------------\n"
    notes-append "${sub_prefix}/scripts/lldb/macos-setup-codesign.sh"
    if {${os.major} >= 13} {
        notes-append "sudo codesign --force --deep --preserve-metadata=identifier,entitlements,resource-rules,requirements,flags,team-identifier --sign lldb_codesign ${sub_prefix}/bin/lldb-server"
    } else {
        notes-append "sudo codesign --force --deep --preserve-metadata=identifier,entitlements,resource-rules,requirements --sign lldb_codesign ${sub_prefix}/bin/lldb-server"
    }
}

post-destroot {
    foreach bin [glob ${destroot}${sub_prefix}/bin/*] {
        set bin_filename [string map "${sub_prefix} ${prefix}" ${bin}]-${suffix}
        set exec_path [string map "${destroot}${sub_prefix} ${sub_prefix}" ${bin}]

        # see https://trac.macports.org/ticket/54985
        if {${os.platform} eq "darwin" && [vercmp ${xcodeversion} 4.6] < 0} {
             xinstall -m 755 "${filespath}/llvm-bin-compat" "${bin_filename}"
        } else {
             xinstall -m 755 "${filespath}/llvm-bin" "${bin_filename}"
        }

        reinplace "s:EXEC_PATH:${exec_path}:" "${bin_filename}"
    }

    if {${subport} eq "llvm-${llvm_version}"} {
        # r156389 (a5d2435409858728970202226d0bbbee508fe408) temporarilary removed llvm man pages
        #foreach man [glob ${destroot}${sub_prefix}/share/man/man1/*.1] {
        #    set basename [string map "${destroot}${sub_prefix}/share/man/man1/ {}" ${man}]
        #    file rename ${man} ${destroot}${prefix}/share/man/man1/[string map ".1 -${suffix}.1" ${basename}]
        #}

        # https://llvm.org/bugs/show_bug.cgi?id=19465
        if {[variant_isset polly]} {
            ln -s LLVMPolly.so ${destroot}${sub_prefix}/lib/LLVMPolly.dylib
        }
    } elseif {${subport} eq "clang-${llvm_version}"} {
        system "ditto ${worksrcpath}/projects/libcxx/include ${destroot}${sub_prefix}/lib/c++/v1"

        # http://trac.macports.org/ticket/33207
        ln -s ${prefix}/libexec/ld64/ld ${destroot}${sub_prefix}/bin/ld
    } elseif {${subport} eq "lldb-${llvm_version}"} {
        delete ${destroot}${prefix}/bin/debugserver-${suffix}

        set lldb_scripts_srcdir ${worksrcpath}/tools/lldb/scripts
        set lldb_scripts_destdir ${destroot}${sub_prefix}/scripts/lldb
        xinstall -d ${lldb_scripts_destdir}
        xinstall -m 755 -W ${lldb_scripts_srcdir} \
            macos-setup-codesign.sh \
            ${lldb_scripts_destdir}
    }
}

variant emulated_tls description { enable c11/c++11 thread_local_storage support on older systems using emulated-tls } {
    # use emulated-tls to support thread_local on systems prior to 10.7
    patchfiles-append      9000-patch-llvm-7.0-support-emulated-tls.diff
    if {${subport} eq "clang-${llvm_version}"} {
        patchfiles-append  9000-patch-clang-7.0-support-emulated-tls.diff
    }
}
default_variants-append +emulated_tls

if {${subport} eq "llvm-${llvm_version}"} {
    variant polly description {Provide the polly polyhedral optimizer} {}

    # Unless upstream reverts to their old OCaml detection mechanism,
    # this variant will be broken until #46161 is resolved.
    variant ocaml description {Enable generation of OCaml binding} {
        depends_lib-append   port:ocaml

        configure.args-delete -DLLVM_BINDINGS_LIST=none
        configure.args-append -DLLVM_BINDINGS_LIST=ocaml

        destroot.args-append  OVERRIDE_libdir=${sub_prefix}/lib
    }
} elseif {${subport} eq "clang-${llvm_version}"} {
    if {[variant_isset assertions]} {
        # Need to match llvm +-assertions
        require_active_variants port:llvm-${llvm_version} assertions
    } else {
        # Need to match llvm +-assertions
        require_active_variants port:llvm-${llvm_version} {} assertions
    }

    variant analyzer description {Install clang static analyzer} {
        # these have to be switched on or off together
        configure.args-replace -DCLANG_ENABLE_STATIC_ANALYZER=OFF \
                               -DCLANG_ENABLE_STATIC_ANALYZER=ON
        configure.args-replace -DCLANG_ENABLE_ARCMT=OFF \
                               -DCLANG_ENABLE_ARCMT=ON

        depends_run-append port:perl5

        post-patch {
            reinplace "s|/usr/bin/env perl|${prefix}/bin/perl5|g" \
                ${worksrcpath}/tools/clang/tools/scan-build/libexec/ccc-analyzer \
                ${worksrcpath}/tools/clang/tools/scan-build/libexec/c++-analyzer \
                ${worksrcpath}/tools/clang/tools/scan-build/bin/scan-build

            # pythonfullpath is set above, depending on presence of system python2.7 or python3
            reinplace "s|/usr/bin/env python|${pythonfullpath}|g" \
                 ${worksrcpath}/tools/clang/tools/scan-view/bin/scan-view

            reinplace "s|/usr/bin/python|${pythonfullpath}|g" \
                ${worksrcpath}/tools/clang/tools/scan-build/bin/set-xcode-analyzer
        }
    }

    if { ${cxx_stdlib} eq "libc++" && ${os.major} < 13 } {
        variant defaultlibcxx description {default to -stdlib=libc++ if not otherwise specified}  {
            # on systems older than darwin 13, if macports.conf is configured to stdlib=libc++
            # then make that the default if not otherwise specified. This matches the behaviour of newer systems.
            patchfiles-append 9003-patch-clang-7.0-default-to-libcxx-on-all-systems.diff
        }
        default_variants-append +defaultlibcxx
    }

    variant libstdcxx description {-stdlib=libstdc++_macports searches for MacPorts libstdc++} {

        patchfiles-append 9001-macports-libstdcxx.diff
        if {${os.major} < 11} {
            # see https://trac.macports.org/ticket/61778
            depends_run-append  port:libstdcxx_clang_fix
        }

        post-patch {
            reinplace "s|@@MACPORTS_GCC_INCLUDE_DIR@@|${prefix}/include/gcc/c++|g" \
                ${worksrcpath}/tools/clang/lib/Frontend/InitHeaderSearch.cpp \
                ${worksrcpath}/tools/clang/lib/Driver/ToolChains/Darwin.cpp
            reinplace "s|@@MACPORTS_HOST_NAME@@|${configure.build_arch}-apple-darwin${os.major}|g" \
                ${worksrcpath}/tools/clang/lib/Driver/ToolChains/Darwin.cpp
            reinplace "s|@@MACPORTS_libstdc++@@|${prefix}/lib/libgcc/libstdc++.6.dylib|g" \
                ${worksrcpath}/tools/clang/lib/Driver/ToolChains/Darwin.cpp

            # GCC was built for ${configure.build_arch}-apple-darwin${os.major}
            # if GCC was also built universal, it has an extra include directory
            # if ${configure.build_arch} is 32-bit, there is an extra 64-bit subdirectory
            # if ${configure.build_arch} is 64-bit, there is an extra 32-bit subdirectory
            # MacPorts GCC cannot compile across platforms
            switch ${configure.build_arch} {
                x86_64 {
                    reinplace {s|@@MACPORTS_TEST_32_64@@|getTriple().getArch() == llvm::Triple::x86_64 ? "" : "i386"|g} \
                        ${worksrcpath}/tools/clang/lib/Driver/ToolChains/Darwin.cpp
                }
                i386 {
                    reinplace {s|@@MACPORTS_TEST_32_64@@|getTriple().getArch() == llvm::Triple::x86_64 ? "x86_64" : ""|g} \
                        ${worksrcpath}/tools/clang/lib/Driver/ToolChains/Darwin.cpp
                }
                ppc64 {
                    reinplace {s|@@MACPORTS_TEST_32_64@@|getTriple().getArch() == llvm::Triple::ppc64 ? "" : "ppc"|g} \
                        ${worksrcpath}/tools/clang/lib/Driver/ToolChains/Darwin.cpp
                }
                ppc {
                    reinplace {s|@@MACPORTS_TEST_32_64@@|getTriple().getArch() == llvm::Triple::ppc64 ? "ppc64" : ""|g} \
                        ${worksrcpath}/tools/clang/lib/Driver/ToolChains/Darwin.cpp
                }
                arm64 {
                    reinplace {s|@@MACPORTS_TEST_32_64@@|""|g} \
                        ${worksrcpath}/tools/clang/lib/Driver/ToolChains/Darwin.cpp
                }
            }
        }
    }
    if { ${cxx_stdlib} eq "libstdc++" } {
        default_variants-append +libstdcxx
    }

    post-patch {
        reinplace "s|@@PREFIX@@|${prefix}|" \
            ${worksrcpath}/tools/clang/lib/Driver/ToolChains/Clang.cpp \
            ${worksrcpath}/tools/clang/lib/Driver/ToolChains/CommonArgs.cpp

        reinplace "s|@CLANG_FORMAT_PATH@|${prefix}/bin/clang-format-${suffix}|g" \
            ${worksrcpath}/tools/clang/tools/clang-format/clang-format-bbedit.applescript \
            ${worksrcpath}/tools/clang/tools/clang-format/clang-format-diff.py            \
            ${worksrcpath}/tools/clang/tools/clang-format/clang-format-sublime.py         \
            ${worksrcpath}/tools/clang/tools/clang-format/clang-format.el                 \
            ${worksrcpath}/tools/clang/tools/clang-format/clang-format.py
    }

    post-destroot {
        file mkdir ${destroot}${sub_prefix}/libexec
        file copy ${worksrcpath}/tools/clang/tools/clang-format ${destroot}${sub_prefix}/libexec/clang-format

        file delete -force ${destroot}${sub_prefix}/libexec/clang-format/.svn
        file delete -force ${destroot}${sub_prefix}/libexec/clang-format/Makefile
        file delete -force ${destroot}${sub_prefix}/libexec/clang-format/Release+Debug+Asserts
        file delete -force ${destroot}${sub_prefix}/libexec/clang-format/CMakeLists.txt
        file delete -force ${destroot}${sub_prefix}/libexec/clang-format/ClangFormat.cpp
    }
}

livecheck.type          none