%global maj_ver 13
%global min_ver 0
%global patch_ver 0
#global rc_ver 3
%global libunwind_version %{maj_ver}.%{min_ver}.%{patch_ver}

%global libunwind_srcdir libunwind-%{libunwind_version}%{?rc_ver:rc%{rc_ver}}.src

Name:       llvm-libunwind
Version:    %{libunwind_version}%{?rc_ver:~rc%{rc_ver}}
Release:    1%{?dist}
Summary:    LLVM libunwind

License:    ASL 2.0 or NCSA or MIT
URL:        http://llvm.org
Source0:    https://github.com/llvm/llvm-project/releases/download/llvmorg-%{version}%{?rc_ver:-rc%{rc_ver}}/%{libunwind_srcdir}.tar.xz
Source1:    https://github.com/llvm/llvm-project/releases/download/llvmorg-%{version}%{?rc_ver:-rc%{rc_ver}}/%{libunwind_srcdir}.tar.xz.sig
Source2:    tstellar-gpg-key.asc

# Upstream tighly ties its build to libcxx source, we don't want to use that
# senario, so we need to maintain that patch downstream.
Patch0:     standalone.patch

BuildRequires:  gcc
BuildRequires:  gcc-c++
BuildRequires:  cmake
BuildRequires:  ninja-build
BuildRequires:  llvm-devel

# For documentation
BuildRequires:  python3-sphinx

# For gpg source verification
BuildRequires:  gnupg2

# Explicitly not supported upstream
ExcludeArch:    s390x

%description

LLVM libunwind is an implementation of the interface defined by the HP libunwind
project. It was contributed Apple as a way to enable clang++ to port to
platforms that do not have a system unwinder. It is intended to be a small and
fast implementation of the ABI, leaving off some features of HP's libunwind
that never materialized (e.g. remote unwinding).

%package devel
Summary:    LLVM libunwind development files
Provides:   libunwind(major) = %{maj_ver}
Requires:   %{name}%{?_isa} = %{version}-%{release}

%description devel
Static and unversioned shared libraries for LLVM libunwind

%package doc
Summary:    libunwind documentation
# jquery.js and langage_data.js are used in the HTML doc and under BSD License
License:    BSD and (ASL 2.0 or NCSA or MIT)

%description doc
Documentation for LLVM libunwind

%prep
%{gpgverify} --keyring='%{SOURCE2}' --signature='%{SOURCE1}' --data='%{SOURCE0}'
%autosetup -n %{libunwind_srcdir} -p2

%build
%cmake -GNinja \
    -DLLVM_CMAKE_PATH=%{_libdir}/cmake/llvm \
    -DCMAKE_BUILD_TYPE=RelWithDebInfo \
    -DLLVM_BUILD_DOCS=ON \
    -DLLVM_ENABLE_SPHINX=ON \
    -DLIBUNWIND_ENABLE_STATIC=OFF \
    -DLIBUNWIND_INCLUDE_DOCS=ON \
    -DSPHINX_WARNINGS_AS_ERRORS=OFF \
    -DLLVM_INSTALL_SPHINX_HTML_DIR=%{_pkgdocdir}/html \
    -DSPHINX_EXECUTABLE=%{_bindir}/sphinx-build-3

%cmake_build

%install

%cmake_install

# We can't install on default location because that would conflict with
# https://src.fedoraproject.org/rpms/libunwind
# ABI wise, even though llvm-libunwind's library is named libunwind, it doesn't
# have the exact same ABI has gcc's libunwind (it actually provides a subset).
mkdir -p %{buildroot}/%{_libdir}/llvm-unwind/
mv %{buildroot}%{_libdir}/libunwind* %{buildroot}/%{_libdir}/llvm-unwind/

rm %{buildroot}%{_docdir}/libunwind/html/.buildinfo
# Same applies to the documentation
mv %{buildroot}%{_docdir}/libunwind %{buildroot}%{_docdir}/llvm-libunwind

%check

# upstream has a hard dependency on libcxx source code for test to be configured
# properly. We can't model that, so rely on gating instead.
#cmake_build --target check-unwind

%files
%license LICENSE.TXT
%dir %{_libdir}/llvm-unwind
%{_libdir}/llvm-unwind/libunwind.so.*

%files devel
%{_libdir}/llvm-unwind/libunwind.so

%files doc
%license LICENSE.TXT
%dir %{_docdir}/llvm-libunwind
%doc %{_docdir}/llvm-libunwind/html

%changelog
* Tue Oct 19 2021 sguelton@redhat.com - 13.0.0-1
- Initial release