# Please keep this package sync with FC

%{!?__cmake_builddir:%global __cmake_builddir %{_vpath_builddir}}

%global maj_ver 20
%global min_ver 1
%global patch_ver 3
#global rc_ver 3
%global flang_version %{maj_ver}.%{min_ver}.%{patch_ver}
%global srcdir llvm-project-%{flang_version}%{?rc_ver:-rc%{rc_ver}}.src
%global toolchain clang

%global major %{maj_ver}.%{min_ver}
%global libname %mklibname flang %{major}
%global devname %mklibname flang -d

# Opt out of https://fedoraproject.org/wiki/Changes/fno-omit-frame-pointer
# https://bugzilla.redhat.com/show_bug.cgi?id=2158587
%undefine _include_frame_pointers

Name: flang
Version: %{flang_version}%{?rc_ver:~rc%{rc_ver}}
Release: %mkrel 1
Summary: a Fortran language front-end designed for integration with LLVM

Group:   Development/Other

License: Apache-2.0 WITH LLVM-exception
URL:     https://flang.llvm.org
Source0: https://github.com/llvm/llvm-project/releases/download/llvmorg-%{flang_version}%{?rc_ver:-rc%{rc_ver}}/%{srcdir}.tar.xz
Source1: https://github.com/llvm/llvm-project/releases/download/llvmorg-%{flang_version}%{?rc_ver:-rc%{rc_ver}}/%{srcdir}.tar.xz.sig
Source2: release-keys.asc

Source8: omp_lib.h
Source9: omp_lib.F90

# The Bye plugin is not distributed on Fedora.
Patch3: 0001-flang-Remove-the-dependency-on-Bye.patch

# Fedora uses CLANG_DEFAULT_PIE_ON_LINUX=OFF.
Patch5: 0001-Match-Fedora-s-value-for-CLANG_DEFAULT_PIE_ON_LINUX.patch

# Fix for standalone builds. Avoid running on non-x86 targets.
Patch6: 0001-Fix-fastmath-test.patch

%{lua:

-- Return the maximum number of parallel jobs a build can run based on the
-- amount of maximum memory used per process (per_proc_mem).
function print_max_procs(per_proc_mem)
    local f = io.open("/proc/meminfo", "r")
    local mem = 0
    local nproc_str = nil
    for line in f:lines() do
        _, _, mem = string.find(line, "MemTotal:%s+(%d+)%s+kB")
        if mem then
           break
        end
    end
    f:close()

    local proc_handle = io.popen("nproc")
    _, _, nproc_str = string.find(proc_handle:read("*a"), "(%d+)")
    proc_handle:close()
    local nproc = tonumber(nproc_str)
    if nproc < 1 then
        nproc = 1
    end
    local mem_mb = mem / 1024
    local cpu = math.floor(mem_mb / per_proc_mem)
    if cpu < 1 then
        cpu = 1
    end

    if cpu > nproc then
        cpu = nproc
    end
    print(cpu)
end
}

# Avoid gcc reaching 4GB of memory on 32-bit targets and also running out of
# memory on builders with many CPUs.
%global _lto_cflags %{nil}
# The amount of RAM used per process has been set by trial and error.
# This number may increase/decrease from time to time and may require changes.
# We prefer to be on the safe side in order to avoid spurious errors.
%global _smp_mflags -j%{lua: print_max_procs(6144)}

# We don't produce debug info on ARM to avoid OOM during the build.
%ifarch %{arm}
%global debug_package %{nil}
%endif

# Link error on i686.
# s390x is not supported upstream yet.
ExcludeArch: %{ix86} s390x %{arm32}

BuildRequires: gcc
BuildRequires: gcc-c++
BuildRequires: cmake
BuildRequires: zlib-devel
BuildRequires: llvm-devel = %{version}
BuildRequires: llvm-cmake-utils = %{version}
BuildRequires: llvm-test = %{version}
BuildRequires: llvm-googletest = %{version}
BuildRequires: mlir-devel = %{version}
BuildRequires: ninja-build
BuildRequires: python3-lit >= 12.0.0
BuildRequires: python3-sphinx
BuildRequires: python3-recommonmark
BuildRequires: python3-myst-parser
BuildRequires: doxygen
BuildRequires: compiler-rt

# The new flang drive requires clang-devel
BuildRequires: clang-devel = %{version}

# For origin certification
BuildRequires: gnupg2

Requires: %{name}-runtime = %{version}-%{release}
# flang installs headers in the clang resource directory
Requires: clang-resource-filesystem = %{version}
%if ! 0%{?mageia:1}
# Up to version 17.0.6-1, flang used to provide a flang-devel package.
# This changed in 17.0.6-2 and all development-related files are now
# distributed in the main flang package.
Obsoletes: flang-devel < 17.0.6-2
%endif

%description

Flang is a ground-up implementation of a Fortran front end written in modern
C++.

%package doc
Summary: Documentation for Flang
BuildArch: noarch
Recommends: %{name} >= %{version}-%{release}

%description doc
Documentation for Flang.

%package -n %{libname}
Summary: Flang runtime libraries
Group: System/Libraries
Provides: %{name}-runtime%{?_isa} = %{version}-%{release}
Provides: %{name}-runtime = %{version}-%{release}

%description -n %{libname}
Flang runtime libraries.

%package -n %{devname}
Summary: Development header files for flang
Group: Development/Other
Provides: flang-devel%{?_isa} = %{version}-%{release}
Provides: flang-devel = %{version}-%{release}
Requires: %{name}-runtime%{?_isa} = %{version}-%{release}
Requires: %{name}%{?_isa} = %{version}-%{release}

%description -n %{devname}
Flang header files.

%prep
%{gpgverify} --keyring='%{SOURCE2}' --signature='%{SOURCE1}' --data='%{SOURCE0}'
%autosetup -n %{srcdir} -p1

mkdir -p flang/%{__cmake_builddir}/projects/openmp/runtime/src/
cp %{SOURCE8} flang/%{__cmake_builddir}/projects/openmp/runtime/src/
cp %{SOURCE9} flang/%{__cmake_builddir}/projects/openmp/runtime/src/

%build
cd flang
%cmake -GNinja \
       -DLLVM_TOOL_OPENMP_BUILD:BOOL=ON \
       -DMLIR_TABLEGEN_EXE=%{_bindir}/mlir-tblgen \
       -DCMAKE_BUILD_TYPE=RelWithDebInfo \
       -DCMAKE_INSTALL_RPATH=";" \
       -DMLIR_DIR=%{_libdir}/cmake/mlir \
       -DLLVM_DIR=%{_libdir}/cmake/llvm \
       -DCLANG_DIR=%{_libdir}/cmake/clang \
       -DCLANG_LINK_CLANG_DYLIB:BOOL=ON \
       -DCLANG_RESOURCE_DIR=../../%{clang_resource_dir} \
       -DBUILD_SHARED_LIBS:BOOL=ON \
       -DLLVM_LINK_LLVM_DYLIB:BOOL=ON \
       -DLLVM_EXTERNAL_LIT=%{_bindir}/lit \
       -DCMAKE_PREFIX_PATH=%{_libdir}/cmake/llvm/ \
       -DMLIR_LINK_MLIR_DYLIB:BOOL=ON \
\
       -DFLANG_INCLUDE_DOCS:BOOL=ON \
       -DLLVM_ENABLE_SPHINX:BOOL=ON \
       -DSPHINX_WARNINGS_AS_ERRORS=OFF \
       -DSPHINX_EXECUTABLE=%{_bindir}/sphinx-build-3 \
\
%if 0%{?__isa_bits} == 64
       -DLLVM_LIBDIR_SUFFIX=64
%else
       -DLLVM_LIBDIR_SUFFIX=
%endif

# Avoid gcc reaching 4GB of memory
%ifarch %{ix86} s390x %{arm32}
sed -i -e 's/-g /-g1 /g' %{__cmake_builddir}/build.ninja
%endif
# On ARM, disable debuginfo entirely to avoid OOM.
%ifarch %{arm}
sed -i -e 's/-g /-g0 /g' -e 's/-O2/-O1/g' %{__cmake_builddir}/build.ninja
%endif

export LD_LIBRARY_PATH=%{_builddir}/%{srcdir}/flang/%{_build}/lib:%{clang_resource_dir}/lib/%{_build}
%cmake_build
%cmake_build --target docs-flang-html


%install
cd flang
%cmake_install

%if ! 0%{?mageia:1}
# Remove unnecessary files.
rm -rf %{buildroot}/%{_libdir}/cmake/
rm -f %{buildroot}/%{_libdir}/libFIRAnalysis.so \
      %{buildroot}/%{_libdir}/libFIRBuilder.so \
      %{buildroot}/%{_libdir}/libFIRCodeGen.so \
      %{buildroot}/%{_libdir}/libFIRDialect.so \
      %{buildroot}/%{_libdir}/libFIRDialectSupport.so \
      %{buildroot}/%{_libdir}/libFIROpenACCSupport.so \
      %{buildroot}/%{_libdir}/libFIRSupport.so \
      %{buildroot}/%{_libdir}/libFIRTestAnalysis.so \
      %{buildroot}/%{_libdir}/libFIRTestOpenACCInterfaces.so \
      %{buildroot}/%{_libdir}/libFIRTransforms.so \
      %{buildroot}/%{_libdir}/libflangFrontend.so \
      %{buildroot}/%{_libdir}/libflangFrontendTool.so \
      %{buildroot}/%{_libdir}/libflangPasses.so \
      %{buildroot}/%{_libdir}/libFlangOpenMPTransforms.so \
      %{buildroot}/%{_libdir}/libFortranCommon.so \
      %{buildroot}/%{_libdir}/libFortranEvaluate.so \
      %{buildroot}/%{_libdir}/libFortranLower.so \
      %{buildroot}/%{_libdir}/libFortranParser.so \
      %{buildroot}/%{_libdir}/libFortranSemantics.so \
      %{buildroot}/%{_libdir}/libFortranSupport.so \
      %{buildroot}/%{_libdir}/libHLFIRDialect.so \
      %{buildroot}/%{_libdir}/libHLFIRTransforms.so
%endif
find %{buildroot}/%{_includedir}/flang -type f -a ! -iname '*.mod' -delete

# this is a test binary
rm -f %{buildroot}%{_bindir}/f18-parse-demo

install -d %{buildroot}%{_pkgdocdir}/html
cp -r %{_vpath_builddir}/docs/html/* %{buildroot}%{_pkgdocdir}/html/

%check

cd flang

%ifarch s390x
rm test/Evaluate/folding07.f90
rm test/Evaluate/fold-nearest.f90
# s390x is not yet supported as a lowering target, so remove all related tests.
rm -rf test/Driver/
rm -rf test/Fir/
rm -rf test/Lower/
%endif

# These tests fail on 32-bit targets.
%ifarch %{ix86} %{arm}
rm -f test/Fir/fir-ops.fir
rm -f test/Semantics/assign03.f90
rm -f test/Semantics/data05.f90
rm -f test/Semantics/offsets01.f90
rm -f test/Semantics/offsets02.f90
rm -f test/Semantics/typeinfo01.f90
rm -f test/Semantics/spec-expr.f90
rm -f test/Evaluate/folding19.f90
%endif

# https://github.com/llvm/llvm-project/issues/126051
rm -rf test/Driver/linker-flags.f90

export LD_LIBRARY_PATH=%{_builddir}/%{srcdir}/flang/%{_build}/lib:%{clang_resource_dir}/lib/%{_build}
%cmake_build --target check-flang

%files
%license LICENSE.TXT
%{_bindir}/tco
%{_bindir}/bbc
%{_bindir}/fir-opt
%{_bindir}/fir-lsp-server
%{_bindir}/flang
%{_bindir}/flang-%{maj_ver}
%{_bindir}/flang-new

%files -n %libname
%{_libdir}/libFIRAnalysis.so.%{major}{,.*}
%{_libdir}/libFIRBuilder.so.%{major}{,.*}
%{_libdir}/libFIRCodeGen.so.%{major}{,.*}
%{_libdir}/libFIRDialect.so.%{major}{,.*}
%{_libdir}/libFIRDialectSupport.so.%{major}{,.*}
%{_libdir}/libFIROpenACCSupport.so.%{major}{,.*}
%{_libdir}/libFIRSupport.so.%{major}{,.*}
%{_libdir}/libFIRTestAnalysis.so.%{major}{,.*}
%{_libdir}/libFIRTestOpenACCInterfaces.so.%{major}{,.*}
%{_libdir}/libFIRTransforms.so.%{major}{,.*}
%{_libdir}/libflangFrontend.so.%{major}{,.*}
%{_libdir}/libflangFrontendTool.so.%{major}{,.*}
%{_libdir}/libflangPasses.so.%{major}{,.*}
%{_libdir}/libFlangOpenMPTransforms.so.%{major}{,.*}
%{_libdir}/libFortranCommon.so.%{major}{,.*}
%{_libdir}/libFortranDecimal.so.%{major}{,.*}
%{_libdir}/libFortranEvaluate.so.%{major}{,.*}
%{_libdir}/libFortranLower.so.%{major}{,.*}
%{_libdir}/libFortranParser.so.%{major}{,.*}
%{_libdir}/libFortranRuntime.so.%{major}{,.*}
%{_libdir}/libFortranSemantics.so.%{major}{,.*}
%{_libdir}/libFortranSupport.so.%{major}{,.*}
%{_libdir}/libHLFIRDialect.so.%{major}{,.*}
%{_libdir}/libHLFIRTransforms.so.%{major}{,.*}
%{_libdir}/libCUFAttrs.so.%{major}{,.*}
%{_libdir}/libCUFDialect.so.%{major}{,.*}

%files -n %devname
%{_libdir}/libFIRAnalysis.so
%{_libdir}/libFIRBuilder.so
%{_libdir}/libFIRCodeGen.so
%{_libdir}/libFIRDialect.so
%{_libdir}/libFIRDialectSupport.so
%{_libdir}/libFIRSupport.so
%{_libdir}/libFIRTestAnalysis.so
%{_libdir}/libFIRTestOpenACCInterfaces.so
%{_libdir}/libFIRTransforms.so
%{_libdir}/libflangFrontend.so
%{_libdir}/libflangFrontendTool.so
%{_libdir}/libflangPasses.so
%{_libdir}/libFlangOpenMPTransforms.so
%{_libdir}/libFortranCommon.so
%{_libdir}/libFortranDecimal.so
%{_libdir}/libFortranEvaluate.so
%{_libdir}/libFortranLower.so
%{_libdir}/libFortranParser.so
%{_libdir}/libFortranRuntime.so
%{_libdir}/libFortranSemantics.so
%{_libdir}/libFortranSupport.so
%{_libdir}/libHLFIRDialect.so
%{_libdir}/libHLFIRTransforms.so
%{_libdir}/libCUFAttrs.so
%{_libdir}/libCUFDialect.so
%{_includedir}/flang/
%{_libdir}/cmake/

%{clang_resource_dir}/include/ISO_Fortran_binding.h

%files doc
%dir %{_pkgdocdir}
%doc %{_pkgdocdir}/html/