Adds initial CMake presets configuration (#2169) #9005

	name: Bitcode loading CI

	on: [push]

	jobs:
	build:
	name: Bitcode loading CI LLVM ${{ matrix.llvm }} ${{ matrix.build }} ${{ matrix.os }}
	runs-on: ${{ matrix.os }}

	strategy:
	fail-fast: false
	matrix:
	# BCLoad tests only run with old pass manager [aka up to and including 13]
	llvm: ["15"]
	build: ["Release"] # "RelWithDebInfo"
	os: [ubuntu-22.04]

	timeout-minutes: 30
	steps:
	- name: add llvm
	run: \|
	wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key\|sudo apt-key add -
	sudo apt-add-repository "deb http://apt.llvm.org/`lsb_release -c \| cut -f2`/ llvm-toolchain-`lsb_release -c \| cut -f2`-${{ matrix.llvm }} main" \|\| true
	sudo apt-get install -y cmake gcc g++ llvm-${{ matrix.llvm }}-dev clang-${{ matrix.llvm }} libclang-${{ matrix.llvm }}-dev
	sudo python3 -m pip install --upgrade pip lit
	- uses: actions/checkout@v4
	- name: mkdir
	run: cd enzyme && rm -rf build && mkdir build
	- name: cmake
	run: \|
	cd enzyme/build
	cmake .. -DLLVM_EXTERNAL_LIT=`which lit` -DCMAKE_BUILD_TYPE=${{ matrix.build }} -DLLVM_DIR=/usr/lib/llvm-${{ matrix.llvm }}/lib/cmake/llvm
	- name: make check-bcpass
	run: cd enzyme/build && make -j `nproc` check-bcpass

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