# Description: LLVM compiler backend
# URL:         http://llvm.org/
# Maintainer:  Thomas Penteker, tek at serverop dot de
# Depends on:  cmake libffi python

name=llvm
version=6.0.0
release=2
source=(https://llvm.org/releases/$version/$name-$version.src.tar.xz
  llvm-config.h
  PR35947-export-LLVMInitializeInstCombine-as-extern-C.patch
  PR36417-DebugInfo-discard-invalid-DBG_VALUE-instructions.patch
  PR36417-fixup-for-rL326769-RegState-Debug-is-being-truncated.patch
  D44391-export-LLVM_DYLIB_COMPONENTS-in-LLVMConfig.cmake.patch
  D44420-cmake-fix-a-typo-in-llvm_config-macro.patch)

build() {
  export CC=gcc
  export CXX=g++

  cd $name-$version.src

  # https://bugs.llvm.org/show_bug.cgi?id=35947
  patch -p1 -i $SRC/PR35947-export-LLVMInitializeInstCombine-as-extern-C.patch

  # https://bugs.llvm.org/show_bug.cgi?id=36417
  patch -p1 -i $SRC/PR36417-DebugInfo-discard-invalid-DBG_VALUE-instructions.patch
  patch -p1 -i $SRC/PR36417-fixup-for-rL326769-RegState-Debug-is-being-truncated.patch

  # https://reviews.llvm.org/D44391
  patch -p1 -i $SRC/D44391-export-LLVM_DYLIB_COMPONENTS-in-LLVMConfig.cmake.patch

  # https://reviews.llvm.org/D44420
  patch -p0 -i $SRC/D44420-cmake-fix-a-typo-in-llvm_config-macro.patch

  mkdir build
  cd build

  cmake -DLLVM_ENABLE_CXX1Y=1 \
    -DLLVM_INCLUDE_EXAMPLES=0 \
    -DLLVM_INCLUDE_TESTS=0 \
    -DLLVM_ENABLE_FFI=1 \
    -DLLVM_ENABLE_OCAMLDOC=0 \
    -DLLVM_TARGETS_TO_BUILD='X86;AMDGPU;BPF' \
    -DLLVM_BUILD_LLVM_DYLIB=1 \
     -DLLVM_INSTALL_UTILS=1 \
    -DCMAKE_BUILD_TYPE=Release \
    -DCMAKE_INSTALL_PREFIX=/usr \
    -DLLVM_APPEND_VC_REV=0 \
    -Wno-dev ..

  MAKEFLAGS="$MAKEFLAGS" make
  make DESTDIR=$PKG install

  # multilib stub
  mv $PKG/usr/include/llvm/Config/llvm-config{,-64}.h
  install -m 0644 $SRC/llvm-config.h $PKG/usr/include/llvm/Config/

}