File clang.spec of Package clang

Name:           clang21
Version:        21.1.7
Release:        %mkrel 1
Summary:        C, C++ and Objective-C compiler (LLVM Clang 21)
Group:          Development/C
License:        NCSA
URL:            https://clang.llvm.org/
Source0:        llvm-project-%{version}.src.tar.xz

# Core build tools
BuildRequires:  cmake
BuildRequires:  ninja
BuildRequires:  gcc
BuildRequires:  gcc-c++
BuildRequires:  python3

# Explicitly depend on your standalone LLVM 21 build
BuildRequires:  llvm21 = %{version}
BuildRequires:  llvm21-devel = %{version}

# Optional but recommended
BuildRequires:  pkgconfig(libedit)
BuildRequires:  zlib-devel

%description
Clang is a C, C++ and Objective-C compiler front end for the LLVM compiler
infrastructure. This package provides Clang 21 built against the standalone
LLVM 21 toolchain.

%prep
%setup -q -n llvm-project-%{version}.src

%build
mkdir -p build
cd build

cmake \
  -G Ninja \
  -DCMAKE_BUILD_TYPE=Release \
  -DCMAKE_INSTALL_PREFIX=%{_prefix} \
  -DCMAKE_INSTALL_LIBDIR=%{_libdir} \
  \
  -DLLVM_DIR=%{_libdir}/cmake/llvm \
  -DLLVM_ENABLE_PROJECTS="clang;clang-tools-extra" \
  -DLLVM_TARGETS_TO_BUILD="X86" \
  -DLLVM_ENABLE_RTTI=ON \
  -DLLVM_ENABLE_EH=ON \
  \
  -DCLANG_BUILD_CLANG_DYLIB=ON \
  -DCLANG_LINK_CLANG_DYLIB=ON \
  -DCLANG_ENABLE_ARCMT=ON \
  -DCLANG_ENABLE_STATIC_ANALYZER=ON \
  -DCLANG_BUILD_TOOLS=ON \
  \
  -DCLANG_RESOURCE_DIR=%{_libdir}/clang/21 \
  -DCLANG_INSTALL_PACKAGE_DIR=%{_libdir}/cmake/clang \
  \
  -DLLVM_INCLUDE_TESTS=OFF \
  -DCLANG_INCLUDE_TESTS=OFF \
  ../llvm

ninja

%install
cd build
DESTDIR=%{buildroot} ninja install

%files
%license llvm/LICENSE.TXT
%doc clang/README.md

# Main compiler binaries
%{_bindir}/clang
%{_bindir}/clang++
%{_bindir}/clang-*
%{_bindir}/clang-cpp*

# Libraries
%{_libdir}/libclang*.so*

# Clang resource directory
%{_libdir}/clang/*

# CMake files
%{_libdir}/cmake/clang/*

%changelog
* Sun Dec 14 2025 Henrik <henrik@example.com> - 21.1.7-1
- Build Clang 21.1.7 against standalone LLVM 21.1.7
- Added explicit llvm21 BuildRequires to enforce correct build order
- Enabled libclang shared library and clang-tools-extra
- Installed resource directory and CMake package files
- Added LLVM_DIR to correctly detect LLVM shared library