Add a dirty trick to find/test PETSc

CMakeLists.txt

@@ -135,6 +135,10 @@ if(${MPI_FOUND})
       message(FATAL_ERROR "MPI support requires ParMETIS which cannot be found!")
     endif()
   endif()
+else()
+  if(PUGS_ENABLE_MPI MATCHES "^ON$")
+    message(FATAL_ERROR "Cannot find MPI!")
+  endif()
 endif()
 
 #------------------------------------------------------
@@ -144,6 +148,7 @@ set(PUGS_ENABLE_PETSC AUTO CACHE STRING
   "Choose one of: AUTO ON OFF")
 
 if (PUGS_ENABLE_PETSC MATCHES "^(AUTO|ON)$")
+  cmake_policy(SET CMP0075 OLD)
   find_package(PETSc)
   set(PUGS_HAS_PETSC ${PETSC_FOUND})
 else()
@@ -152,6 +157,10 @@ endif()
 
 if (${PETSC_FOUND})
   include_directories(SYSTEM ${PETSC_INCLUDES})
+else()
+  if (PUGS_ENABLE_PETSC MATCHES "^ON$")
+    message(FATAL_ERROR "Could not find PETSc!")
+  endif()
 endif()
 
 

packages/cmake-modules/FindPETSc.cmake

@@ -278,7 +278,14 @@ int main(int argc,char *argv[]) {
   return 0;
 }
 ")
-    multipass_source_runs ("${includes}" "${libraries}" "${_PETSC_TEST_SOURCE}" ${runs} "${PETSC_LANGUAGE_BINDINGS}")
+    multipass_source_runs(
+      "${includes} ${MPI_CXX_INCLUDE_DIRS} ${MPI_CXX_COMPILER_INCLUDE_DIRS}"
+      "${libraries}"
+      "${_PETSC_TEST_SOURCE}"
+      ${runs}
+      "${PETSC_LANGUAGE_BINDINGS}"
+      )
+
     if (${${runs}})
       set (PETSC_EXECUTABLE_RUNS "YES" CACHE BOOL
         "Can the system successfully run a PETSc executable?  This variable can be manually set to \"YES\" to force CMake to accept a given PETSc configuration, but this will almost always result in a broken build.  If you change PETSC_DIR, PETSC_ARCH, or PETSC_CURRENT you would have to reset this variable." FORCE)