Merge pull request #3299 from heplesser/fix-openmp-cmake

Allow passing OpenMP root directory to -Dwith-openmp

Author: heplesser

.github/workflows/nestbuildmatrix.yml

@@ -798,8 +798,7 @@ jobs:
               -Dwith-optimize=${{ contains(matrix.use, 'optimize') && 'ON' || 'OFF' }} \
               -Dwith-warning=${{ contains(matrix.use, 'warning') && 'ON' || 'OFF' }} \
               -Dwith-boost=${{ contains(matrix.use, 'boost') && 'ON' || 'OFF' }} \
-              -Dwith-openmp=${{ contains(matrix.use, 'openmp') && 'ON' || 'OFF' }} \
-              ${{ contains(matrix.use, 'openmp') && '-DOpenMP_ROOT=$(brew --prefix libomp)' }} \
+              -Dwith-openmp=${{ contains(matrix.use, 'openmp') && '$(brew --prefix libomp)' || 'OFF' }} \
               -Dwith-mpi=${{ contains(matrix.use, 'mpi') && 'ON' || 'OFF' }} \
               -Dwith-python=${{ contains(matrix.use, 'python') && 'ON' || 'OFF' }} \
               -Dwith-gsl=${{ contains(matrix.use, 'gsl') && 'ON' || 'OFF' }} \

cmake/ConfigureSummary.cmake

@@ -62,6 +62,32 @@ function( NEST_PRINT_CONFIG_SUMMARY )
     message( "Python bindings     : No" )
   endif ()
 
+  message( "" )
+  if ( OpenMP_FOUND )
+    message( "Use threading       : Yes (OpenMP: ${OpenMP_CXX_FLAGS})" )
+    message( "    Libraries       : ${OpenMP_CXX_LIBRARIES}" )
+  else ()
+    message( "Use threading       : No" )
+  endif ()
+
+  message( "" )
+  if ( HAVE_MPI )
+    message( "Use MPI             : Yes (MPI: ${MPI_CXX_COMPILER})" )
+    message( "    Includes        : ${MPI_CXX_INCLUDE_PATH}" )
+    message( "    Libraries       : ${MPI_CXX_LIBRARIES}" )
+    if ( MPI_CXX_COMPILE_FLAGS )
+      message( "    Compile Flags   : ${MPI_CXX_COMPILE_FLAGS}" )
+    endif ()
+    if ( MPI_CXX_LINK_FLAGS )
+      message( "    Link Flags      : ${MPI_CXX_LINK_FLAGS}" )
+    endif ()
+    set( MPI_LAUNCHER "${MPIEXEC} ${MPIEXEC_NUMPROC_FLAG} <np> ${MPIEXEC_PREFLAGS} <prog> ${MPIEXEC_POSTFLAGS} <args>" )
+    string(REPLACE "  " " " MPI_LAUNCHER ${MPI_LAUNCHER})
+    message( "    Launcher        : ${MPI_LAUNCHER}")
+  else ()
+    message( "Use MPI             : No" )
+  endif ()
+
   message( "" )
   if ( BUILD_DOCS )
     message( "Documentation       : Yes" )
@@ -85,13 +111,6 @@ function( NEST_PRINT_CONFIG_SUMMARY )
     message( "Documentation       : No" )
   endif ()
 
-  message( "" )
-  if ( OPENMP_FOUND )
-    message( "Use threading       : Yes (OpenMP: ${OpenMP_CXX_FLAGS})" )
-    message( "    Libraries       : ${OpenMP_CXX_LIBRARIES}" )
-  else ()
-    message( "Use threading       : No" )
-  endif ()
 
   message( "" )
   if ( HAVE_GSL )
@@ -125,24 +144,6 @@ function( NEST_PRINT_CONFIG_SUMMARY )
     endif ()
   endif ()
 
-  message( "" )
-  if ( HAVE_MPI )
-    message( "Use MPI             : Yes (MPI: ${MPI_CXX_COMPILER})" )
-    message( "    Includes        : ${MPI_CXX_INCLUDE_PATH}" )
-    message( "    Libraries       : ${MPI_CXX_LIBRARIES}" )
-    if ( MPI_CXX_COMPILE_FLAGS )
-      message( "    Compile Flags   : ${MPI_CXX_COMPILE_FLAGS}" )
-    endif ()
-    if ( MPI_CXX_LINK_FLAGS )
-      message( "    Link Flags      : ${MPI_CXX_LINK_FLAGS}" )
-    endif ()
-    set( MPI_LAUNCHER "${MPIEXEC} ${MPIEXEC_NUMPROC_FLAG} <np> ${MPIEXEC_PREFLAGS} <prog> ${MPIEXEC_POSTFLAGS} <args>" )
-    string(REPLACE "  " " " MPI_LAUNCHER ${MPI_LAUNCHER})
-    message( "    Launcher        : ${MPI_LAUNCHER}")
-  else ()
-    message( "Use MPI             : No" )
-  endif ()
-
   message( "" )
   if ( TIMER_DETAILED )
     message( "Detailed timers     : Yes" )

cmake/FindSIONlib.cmake

@@ -57,9 +57,9 @@ if ( NOT SIONLIB_CONFIG STREQUAL "SIONLIB_CONFIG-NOTFOUND" )
   # get arguments for sionconfig --cflags and --libs
   set( CONF_FLAGS "--cxx" ) # we use cxx
   # find parallelization
-  if ( OPENMP_FOUND AND MPI_CXX_FOUND )
+  if ( OpenMP_FOUND AND MPI_CXX_FOUND )
     set( CONF_FLAGS ${CONF_FLAGS} "--ompi" )
-  elseif ( OPENMP_FOUND )
+  elseif ( OpenMP_FOUND )
     set( CONF_FLAGS ${CONF_FLAGS} "--omp" )
   elseif ( MPI_CXX_FOUND )
     set( CONF_FLAGS ${CONF_FLAGS} "--mpi" )
@@ -70,7 +70,6 @@ if ( NOT SIONLIB_CONFIG STREQUAL "SIONLIB_CONFIG-NOTFOUND" )
     set( CONF_FLAGS ${CONF_FLAGS} "--gcc" )
   endif ()
 
-
   # use sionconfig to get --cflags
   execute_process(
       COMMAND ${SIONLIB_CONFIG} ${CONF_FLAGS} --cflags

cmake/ProcessOptions.cmake

@@ -382,20 +382,17 @@ endfunction()
 
 function( NEST_PROCESS_WITH_OPENMP )
   # Find OPENMP
-  if ( with-openmp )
+  if ( NOT "${with-openmp}" STREQUAL "OFF" )
     if ( NOT "${with-openmp}" STREQUAL "ON" )
-      printInfo( "Set OpenMP argument: ${with-openmp}")
-      # set variables in this scope
-      set( OPENMP_FOUND ON )
-      set( OpenMP_C_FLAGS "${with-openmp}" )
-      set( OpenMP_CXX_FLAGS "${with-openmp}" )
-      set( OpenMP_CXX_LIBRARIES "${with-openmp}" )
-    else ()
-      find_package( OpenMP )
+      # if set, use this prefix
+      set( OpenMP_ROOT "${with-openmp}" )
     endif ()
-    if ( OPENMP_FOUND )
+
+    find_package( OpenMP REQUIRED )
+
+    if ( OpenMP_FOUND )
       # export found variables to parent scope
-      set( OPENMP_FOUND "${OPENMP_FOUND}" PARENT_SCOPE )
+      set( OpenMP_FOUND "${OpenMP_FOUND}" PARENT_SCOPE )
       set( OpenMP_C_FLAGS "${OpenMP_C_FLAGS}" PARENT_SCOPE )
       set( OpenMP_CXX_FLAGS "${OpenMP_CXX_FLAGS}" PARENT_SCOPE )
       set( OpenMP_CXX_LIBRARIES "${OpenMP_CXX_LIBRARIES}" PARENT_SCOPE )
@@ -405,7 +402,7 @@ function( NEST_PROCESS_WITH_OPENMP )
     else()
       printError( "CMake can not find OpenMP." )
     endif ()
-  endif ()
+  endif ()  # if NOT OFF
 
   # Provide a dummy OpenMP::OpenMP_CXX if no OpenMP or if flags explicitly
   # given. Needed to avoid problems where OpenMP::OpenMP_CXX is used.