SuperBuild: fix fftw patch for macosx

SuperBuild/CMake/External_fftw.cmake

-if(NOT __EXTERNAL_FFTW__)
+if( __EXTERNAL_FFTW__)
+  return()
+else()  
   set(__EXTERNAL_FFTW__ 1)
+endif()
 
-  if(USE_SYSTEM_FFTW)
-    # TODO : use ITK's FindFFTW
-    #find_package ( FFTW )
-    message(STATUS "  Using FFTW system version")
-  else()
-    SETUP_SUPERBUILD(PROJECT FFTW)
+if(USE_SYSTEM_FFTW)
+  message(STATUS "  Using FFTW system version")
+  return()
+endif()  
 
-    set(FFTWF_SB_SRC ${CMAKE_BINARY_DIR}/FFTW/src/FFTWF)
-    set(FFTWD_SB_SRC ${CMAKE_BINARY_DIR}/FFTW/src/FFTWD)
+SETUP_SUPERBUILD(PROJECT FFTW)
 
-    if(MSVC)
-      # TODO : get precompiled binaries as not all MSVC versions can compile FFTW
-      message(STATUS "  FFTW SuperBuild is not available yet...")
-      add_custom_target(FFTW)
-    else()
-      message(STATUS "  Using FFTW SuperBuild version")
+set(FFTWF_SB_SRC ${CMAKE_BINARY_DIR}/FFTW/src/FFTWF)
+set(FFTWD_SB_SRC ${CMAKE_BINARY_DIR}/FFTW/src/FFTWD)
 
-      # Compile the float version of FFTW
-      ExternalProject_Add(FFTWF
-        PREFIX FFTW/FFTWF
-        URL "http://www.fftw.org/fftw-3.3.4.tar.gz"
-        URL_MD5 2edab8c06b24feeb3b82bbb3ebf3e7b3
-        SOURCE_DIR ${FFTWF_SB_SRC}
-        BINARY_DIR ${FFTWF_SB_SRC}
-        INSTALL_DIR ${SB_INSTALL_PREFIX}
-        DOWNLOAD_DIR ${DOWNLOAD_LOCATION}
-        CONFIGURE_COMMAND
-        ${SB_ENV_CONFIGURE_CMD}
-        ${FFTWF_SB_SRC}/configure
-        --prefix=${SB_INSTALL_PREFIX}
-        --enable-shared
-        --disable-static
-        --enable-float
-        --enable-threads
-        --disable-fortran
-        --disable-dependency-tracking
-        DEPENDS ${FFTW_DEPENDENCIES}
-        )
+if(MSVC)
+  # TODO : get precompiled binaries as not all MSVC versions can compile FFTW
+  message(STATUS "  FFTW SuperBuild is not available yet...")
+  add_custom_target(FFTW)
+  return()
+endif()
 
-      if(APPLE)
-        SUPERBUILD_PATCH_SOURCE(FFTWF "patch-for-at-rpath" ${CMAKE_SOURCE_DIR}/patches/FFTW)
-      endif()
 
-      # Compile the double version of FFTW
-      ExternalProject_Add(FFTWD
-        PREFIX FFTW/FFTWD
-        URL "http://www.fftw.org/fftw-3.3.4.tar.gz"
-        URL_MD5 2edab8c06b24feeb3b82bbb3ebf3e7b3
-        SOURCE_DIR ${FFTWD_SB_SRC}
-        BINARY_DIR ${FFTWD_SB_SRC}
-        INSTALL_DIR ${SB_INSTALL_PREFIX}
-        DOWNLOAD_DIR ${DOWNLOAD_LOCATION}
-        CONFIGURE_COMMAND
-        ${SB_ENV_CONFIGURE_CMD}
-        ${FFTWD_SB_SRC}/configure
-        --prefix=${SB_INSTALL_PREFIX}
-        --enable-shared
-        --disable-static
-        --disable-float
-        --enable-threads
-        --disable-fortran
-        --disable-dependency-tracking
-        )
+message(STATUS "  Using FFTW SuperBuild version")
 
-      if(APPLE)
-        SUPERBUILD_PATCH_SOURCE(FFTWD "patch-for-at-rpath" ${CMAKE_SOURCE_DIR}/patches/FFTW)
-      endif()
+# Compile the float version of FFTW
+ExternalProject_Add(FFTWF
+  PREFIX FFTW/FFTWF
+  URL "http://www.fftw.org/fftw-3.3.4.tar.gz"
+  URL_MD5 2edab8c06b24feeb3b82bbb3ebf3e7b3
+  SOURCE_DIR ${FFTWF_SB_SRC}
+  BINARY_DIR ${FFTWF_SB_SRC}
+  INSTALL_DIR ${SB_INSTALL_PREFIX}
+  DOWNLOAD_DIR ${DOWNLOAD_LOCATION}
+  CONFIGURE_COMMAND
+  ${SB_ENV_CONFIGURE_CMD}
+  ${FFTWF_SB_SRC}/configure
+  --prefix=${SB_INSTALL_PREFIX}
+  --enable-shared
+  --disable-static
+  --enable-float
+  --enable-threads
+  --disable-fortran
+  --disable-dependency-tracking
+  DEPENDS ${FFTW_DEPENDENCIES}
+  )
 
-      ExternalProject_Add(FFTW
-        PREFIX FFTW
-        DOWNLOAD_COMMAND ""
-        CONFIGURE_COMMAND ""
-        BUILD_COMMAND ""
-        INSTALL_COMMAND ""
-        DEPENDS FFTWF FFTWD
-        )
+SUPERBUILD_PATCH_SOURCE(FFTWF "patch-for-at-rpath")
 
-      set(_SB_FFTW_INCLUDE_PATH ${SB_INSTALL_PREFIX}/include)
+# Compile the double version of FFTW
+ExternalProject_Add(FFTWD
+  PREFIX FFTW/FFTWD
+  URL "http://www.fftw.org/fftw-3.3.4.tar.gz"
+  URL_MD5 2edab8c06b24feeb3b82bbb3ebf3e7b3
+  SOURCE_DIR ${FFTWD_SB_SRC}
+  BINARY_DIR ${FFTWD_SB_SRC}
+  INSTALL_DIR ${SB_INSTALL_PREFIX}
+  DOWNLOAD_DIR ${DOWNLOAD_LOCATION}
+  CONFIGURE_COMMAND
+  ${SB_ENV_CONFIGURE_CMD}
+  ${FFTWD_SB_SRC}/configure
+  --prefix=${SB_INSTALL_PREFIX}
+  --enable-shared
+  --disable-static
+  --disable-float
+  --enable-threads
+  --disable-fortran
+  --disable-dependency-tracking
+  )
 
-    endif()
 
-  endif()
-endif()
+SUPERBUILD_PATCH_SOURCE(FFTWD "patch-for-at-rpath")
+
+ExternalProject_Add(FFTW
+  PREFIX FFTW
+  DOWNLOAD_COMMAND ""
+  CONFIGURE_COMMAND ""
+  BUILD_COMMAND ""
+  INSTALL_COMMAND ""
+  DEPENDS FFTWF FFTWD
+  )
+
+set(_SB_FFTW_INCLUDE_PATH ${SB_INSTALL_PREFIX}/include)

SuperBuild/patches/FFTWF/fftwf-1-rpathfix-macx.diff

+--- fftw-3.3.4.orig/configure	2016-04-19 09:26:21.000000000 +0200
++++ fftw-3.3.4/configure	2016-04-19 09:27:21.000000000 +0200
+@@ -10776,9 +10776,9 @@
+   esac
+   if test "$_lt_dar_can_shared" = "yes"; then
+     output_verbose_link_cmd=func_echo_all
+-    archive_cmds="\$CC -dynamiclib \$allow_undefined_flag -o \$lib \$libobjs \$deplibs \$compiler_flags -install_name \$rpath/\$soname \$verstring $_lt_dar_single_mod${_lt_dsymutil}"
++    archive_cmds="\$CC -dynamiclib \$allow_undefined_flag -o \$lib \$libobjs \$deplibs \$compiler_flags -install_name \@rpath/\$soname \$verstring $_lt_dar_single_mod${_lt_dsymutil}"
+     module_cmds="\$CC \$allow_undefined_flag -o \$lib -bundle \$libobjs \$deplibs \$compiler_flags${_lt_dsymutil}"
+-    archive_expsym_cmds="sed 's,^,_,' < \$export_symbols > \$output_objdir/\${libname}-symbols.expsym~\$CC -dynamiclib \$allow_undefined_flag -o \$lib \$libobjs \$deplibs \$compiler_flags -install_name \$rpath/\$soname \$verstring ${_lt_dar_single_mod}${_lt_dar_export_syms}${_lt_dsymutil}"
++    archive_expsym_cmds="sed 's,^,_,' < \$export_symbols > \$output_objdir/\${libname}-symbols.expsym~\$CC -dynamiclib \$allow_undefined_flag -o \$lib \$libobjs \$deplibs \$compiler_flags -install_name \@rpath/\$soname \$verstring ${_lt_dar_single_mod}${_lt_dar_export_syms}${_lt_dsymutil}"
+     module_expsym_cmds="sed -e 's,^,_,' < \$export_symbols > \$output_objdir/\${libname}-symbols.expsym~\$CC \$allow_undefined_flag -o \$lib -bundle \$libobjs \$deplibs \$compiler_flags${_lt_dar_export_syms}${_lt_dsymutil}"
+ 
+   else