Merge pull request #296 from lanl/mauneyc/fix-submodule-cmake-dir

Change cmake module append to use PROJECT_ insteand of CMAKE_

CHANGELOG.md

@@ -4,6 +4,7 @@
 - [[PR269]](https://github.com/lanl/singularity-eos/pull/269) Add SAP Polynomial EoS
 
 ### Fixed (Repair bugs, etc)
+- [[PR296]](https://github.com/lanl/singularity-eos/pull/296) changed `CMAKE_SOURCE_DIR` to `PROJECT_SOURCE_DIR` to fix downstream submodule build
 - [[PR291]](https://github.com/lanl/singularity-eos/pull/291) package.py updates to reflect new CMake options 
 - [[PR290]](https://github.com/lanl/singularity-eos/pull/290) Added target guards on export config
 - [[PR288]](https://github.com/lanl/singularity-eos/pull/288) Don't build tests that depend on spiner when spiner is disabled

CMakeLists.txt

@@ -27,7 +27,7 @@ project(
   VERSION 1.7.0
   LANGUAGES NONE)
 
-list(APPEND CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake")
+list(APPEND CMAKE_MODULE_PATH "${PROJECT_SOURCE_DIR}/cmake")
 
 set(SINGULARITY_GOLDFILES_VERSION "goldfiles-1.6.2")
 set(SINGULARITY_GOLDFILE_HASH
@@ -48,7 +48,7 @@ option(SINGULARITY_USE_FORTRAN "Enable fortran bindings" ON)
 option(SINGULARITY_USE_KOKKOS "Use Kokkos for portability" OFF)
 option(SINGULARITY_USE_EOSPAC "Enable eospac backend" OFF)
 
-#TODO This should be dependent option (or fortran option)
+# TODO This should be dependent option (or fortran option)
 option(SINGULARITY_BUILD_CLOSURE "Mixed Cell Closure" ON)
 
 cmake_dependent_option(SINGULARITY_USE_CUDA "Use CUDA backend of Kokkos" OFF