Add some test code to build PETSc through externalproject

cmake/ThirdPartyPETSc.cmake

@@ -5,16 +5,52 @@ CMAKE_DEPENDENT_OPTION(THIRDPARTY_BUILD_PETSC
     "Build PETSc if needed" OFF
     "NEKTAR_USE_PETSC" OFF)
 
-IF( NEKTAR_USE_PETSC )
-    INCLUDE(FindPETSc)
-    MESSAGE(STATUS "Found PETSc: ${PETSC_LIBRARIES}")
+IF (NEKTAR_USE_PETSC)
     ADD_DEFINITIONS(-DNEKTAR_USING_PETSC)
-    INCLUDE_DIRECTORIES(${PETSC_INCLUDES})
+
+    IF (THIRDPARTY_BUILD_PETSC)
+        INCLUDE(ExternalProject)
+
+        SET(PETSC_C_COMPILER "${CMAKE_C_COMPILER}")
+        SET(PETSC_CXX_COMPILER "${CMAKE_CXX_COMPILER}")
+
+        IF (NEKTAR_USE_MPI)
+            IF (NOT MPI_BUILTIN)
+                SET(PETSC_C_COMPILER "${MPI_C_COMPILER}")
+                SET(PETSC_CXX_COMPILER "${MPI_CXX_COMPILER}")
+            ENDIF (NOT MPI_BUILTIN)
+        ELSE (NEKTAR_USE_MPI)
+            SET(PETSC_NO_MPI "--with-mpi=0")
+        ENDIF (NEKTAR_USE_MPI)
+
+        EXTERNALPROJECT_ADD(
+            petsc-3.5.1
+            PREFIX ${TPSRC}
+            BINARY_DIR ${TPSRC}/src/petsc-3.5.1
+            URL http://ftp.mcs.anl.gov/pub/petsc/release-snapshots/petsc-lite-3.5.1.tar.gz
+            URL_MD5 "539b3bdb627407b7e4e9e830fd5ccf43"
+            DOWNLOAD_DIR ${TPSRC}
+            CONFIGURE_COMMAND ./configure
+                --with-cc=${PETSC_C_COMPILER}
+                --with-cxx=${PETSC_CXX_COMPILER}
+                --prefix=${TPSRC}/dist
+                --with-petsc-arch=c-opt
+                --with-fc=0
+                ${PETSC_NO_MPI}
+                )
+
+        INCLUDE_DIRECTORIES(${TPSRC}/dist/include)
+        SET(PETSC_LIBRARIES "${TPSRC}/dist/lib/libpetsc.a")
+        MESSAGE(STATUS "Will build PETSc")
+    ELSE (THIRDPARTY_BUILD_PETSC)
+        INCLUDE(FindPETSc)
+        IF (NOT PETSC_FOUND)
+            MESSAGE(FATAL_ERROR "Could not find PETSc")
+        ELSE (NOT PETSC_FOUND)
+            MESSAGE(STATUS "Found PETSc: ${PETSC_LIBRARIES}")
+        ENDIF (NOT PETSC_FOUND)
+        INCLUDE_DIRECTORIES(${PETSC_INCLUDES})
+    ENDIF (THIRDPARTY_BUILD_PETSC)
 ENDIF( NEKTAR_USE_PETSC )
 
 INCLUDE_DIRECTORIES(${PETSC_INCLUDES})
-
-
-
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