Remove cmake cmp hack (rust-lang#707)

* Remove cmake cmp hack

* Add CI and fix

Author: wsmoses

.github/workflows/enzyme-ci.yml

@@ -85,3 +85,28 @@ jobs:
       run: cd enzyme/build && make check-activityanalysis -j 3
     - name: make check-enzyme
       run: cd enzyme/build && make check-enzyme -j 3
+
+  build-xcode:
+    name: Enzyme CI LLVM ${{ matrix.llvm }} ${{ matrix.build }} macOS XCode
+    runs-on: macos-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        llvm: ["13"] #, "14"]
+        build: ["Release"] # "RelWithDebInfo"
+
+    timeout-minutes: 30
+    steps:
+    - name: add llvm
+      run: |
+          brew install llvm@${{ matrix.llvm }} autoconf make cmake gcc libtool
+          sudo python3 -m pip install --upgrade pip setuptools
+          sudo python3 -m pip install lit
+    - uses: actions/checkout@v2
+    - name: mkdir
+      run: cd enzyme && rm -rf build && mkdir build
+    - name: cmake
+      run: |
+          cd enzyme/build
+          cmake .. -GXcode -DCMAKE_BUILD_TYPE=${{ matrix.build }} -DLLVM_EXTERNAL_LIT=`which lit` -DLLVM_DIR=`brew --prefix llvm@${{ matrix.llvm }}`/lib/cmake/llvm

enzyme/CMakeLists.txt

@@ -23,10 +23,6 @@ SET(CMAKE_CXX_FLAGS_DEBUG  "-O0 -g -ggdb -fno-omit-frame-pointer")
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
-if(${CMAKE_VERSION} VERSION_GREATER "3.20.0") 
-    cmake_policy(SET CMP0116 OLD)
-endif()
-
 option(ENZYME_CLANG "Build enzyme clang plugin" ON)
 option(ENZYME_EXTERNAL_SHARED_LIB "Build external shared library" OFF)
 set(ENZYME_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
@@ -66,7 +62,7 @@ get_filename_component(LLVM_ABSOLUTE_LIT
 message("found llvm lit " ${LLVM_EXTERNAL_LIT})
 
 list(INSERT CMAKE_PREFIX_PATH 0 "${LLVM_DIR}")
-
+set(LLVM_MAIN_SRC_DIR "${CMAKE_CURRENT_SOURCE_DIR}")
 if (ENZYME_CLANG)
 if (DEFINED Clang_DIR)
     get_filename_component(Clang_ABSOLUTE_DIR

enzyme/cmake/dummy.cpp

@@ -0,0 +1 @@
+typedef int dummy;