CMake: set versioning variables before project()

CMakeLists.txt

@@ -1,9 +1,54 @@
 cmake_minimum_required(VERSION 3.14)
-project(AMReX)
-enable_language(C) # needed for find_package(MPI REQUIRED "C")
-enable_language(CXX)
-enable_language(Fortran)
 
+########################################################################
+#
+# Set variables for AMReX versioning
+#
+########################################################################
+find_package (Git QUIET)
+
+set( _tmp "" )
+
+if ( EXISTS ${CMAKE_SOURCE_DIR}/.git AND ${GIT_FOUND} )
+   execute_process ( COMMAND git describe --abbrev=12 --dirty --always --tags
+      WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+      OUTPUT_VARIABLE _tmp )
+   string( STRIP ${_tmp} _tmp )
+else ()
+   # Grep first line from file CHANGES if cannot find version from Git
+   file(STRINGS ${CMAKE_SOURCE_DIR}/CHANGES ALL_VERSIONS REGEX "#")
+   list(GET ALL_VERSIONS 0 _tmp)
+   string(REPLACE "#" "" _tmp "${_tmp}")
+   string(STRIP "${_tmp}" _tmp )
+   set(_tmp "${_tmp}.0")
+endif ()
+
+set( AMREX_GIT_VERSION "${_tmp}" CACHE INTERNAL "" )
+unset(_tmp)
+
+# Package version is a modified form of AMREX_GIT_VERSION
+if (AMREX_GIT_VERSION)
+    string(FIND "${AMREX_GIT_VERSION}" "-" _idx REVERSE)
+    string(SUBSTRING "${AMREX_GIT_VERSION}" 0 "${_idx}" _pkg_version )
+    string(FIND "${_pkg_version}" "-" _idx REVERSE)
+    string(SUBSTRING "${_pkg_version}" 0 "${_idx}" _pkg_version )
+    string(REPLACE "-" "." _pkg_version "${_pkg_version}")
+endif ()
+
+set( AMREX_PKG_VERSION "${_pkg_version}" CACHE INTERNAL "" )
+unset(_pkg_version)
+
+########################################################################
+#
+# AMReX project
+#
+########################################################################
+project( AMReX
+    DESCRIPTION "A software framework for massively parallel, block-structured adaptive mesh refinement (AMR) applications"
+    VERSION  ${AMREX_PKG_VERSION}
+    HOMEPAGE_URL "https://amrex-codes.github.io/amrex/"
+    LANGUAGES C CXX Fortran
+    )
 #
 # Load required modules
 #
@@ -38,30 +83,6 @@ endif ()
 #
 set_default_config_flags ()
 
-#
-# Set variable for AMReX versioning
-#
-find_package (Git QUIET)
-
-set ( TMP "" )
-
-if ( EXISTS ${CMAKE_SOURCE_DIR}/.git AND ${GIT_FOUND} )
-   execute_process ( COMMAND git describe --abbrev=12 --dirty --always --tags
-      WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
-      OUTPUT_VARIABLE TMP )
-   string ( STRIP ${TMP} TMP )
-else ()
-   # Grep first line from file CHANGES if AMREX_GIT_VERSION is not
-   # provided
-   file(STRINGS ${PROJECT_SOURCE_DIR}/CHANGES ALL_VERSIONS REGEX "#")
-   list(GET ALL_VERSIONS 0 TMP)
-   string(REPLACE "#" "" TMP "${TMP}")
-   string (STRIP "${TMP}" TMP )
-   set (TMP "${TMP}.0")
-endif ()
-
-set ( AMREX_GIT_VERSION "${TMP}" CACHE INTERNAL "" )
-unset (TMP)
 
 #
 # Source files for all binaries and libraries found under src

Tools/CMake/AMReXInstallHelpers.cmake

@@ -81,20 +81,9 @@ function (install_amrex)
       ${PROJECT_BINARY_DIR}/export/AMReXConfig.cmake
       INSTALL_DESTINATION bin/cmake/AMReX )
 
-
-   # Install Version file
-   # Package version is a modified form of AMREX_GIT_VERSION
-   if (AMREX_GIT_VERSION)
-      string(FIND "${AMREX_GIT_VERSION}" "-" _idx REVERSE)
-      string(SUBSTRING "${AMREX_GIT_VERSION}" 0 "${_idx}" _pkg_version )
-      string(FIND "${_pkg_version}" "-" _idx REVERSE)
-      string(SUBSTRING "${_pkg_version}" 0 "${_idx}" _pkg_version )
-      string(REPLACE "-" "." _pkg_version "${_pkg_version}")
-   endif ()
-
-   write_basic_package_version_file( ${PROJECT_BINARY_DIR}/export/AMReXConfigVersion.cmake
-      VERSION ${_pkg_version}
-      COMPATIBILITY AnyNewerVersion )
+   write_basic_package_version_file(
+       ${PROJECT_BINARY_DIR}/export/AMReXConfigVersion.cmake
+       COMPATIBILITY AnyNewerVersion )
 
    install( FILES
       ${PROJECT_BINARY_DIR}/export/AMReXConfig.cmake