1 files changed, 95 insertions, 0 deletions
diff --git a/Modules/CMakeParseImplicitIncludeInfo.cmake b/Modules/CMakeParseImplicitIncludeInfo.cmake
new file mode 100644
index 0000000..9901fea
--- /dev/null
+++ b/Modules/CMakeParseImplicitIncludeInfo.cmake
@@ -0,0 +1,95 @@
+# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+# This is used internally by CMake and should not be included by user code.
+
+# helper function that parses implicit include dirs from a single line
+# for compilers that report them that way.  on success we return the
+# list of dirs in id_var and set state_var to the 'done' state.
+function(cmake_parse_implicit_include_line line lang id_var log_var state_var)
+  # clear variables we append to (avoids possible polution from parent scopes)
+  unset(rv)
+  set(log "")
+
+  # ccfe: cray compiler front end (PrgEnv-cray)
+  if("${CMAKE_${lang}_COMPILER_ID}" STREQUAL "Cray" AND
+     "${line}" MATCHES "-isystem")
+    string(REGEX MATCHALL " (-I ?|-isystem )([^ ]*)" incs "${line}")
+    foreach(inc IN LISTS incs)
+      string(REGEX REPLACE " (-I ?|-isystem )([^ ]*)" "\\2" idir "${inc}")
+      list(APPEND rv "${idir}")
+    endforeach()
+    if(rv)
+      string(APPEND log "  got implicit includes via cray ccfe parser!\n")
+    else()
+      string(APPEND log "  warning: cray ccfe parse failed!\n")
+    endif()
+  endif()
+
+  if(log)
+    set(${log_var} "${log}" PARENT_SCOPE)
+  endif()
+  if(rv)
+    set(${id_var} "${rv}" PARENT_SCOPE)
+    set(${state_var} "done" PARENT_SCOPE)
+  endif()
+endfunction()
+
+# top-level function to parse implicit include directory information
+# from verbose compiler output. sets state_var in parent to 'done' on success.
+function(cmake_parse_implicit_include_info text lang dir_var log_var state_var)
+  set(state start)    # values: start, loading, done
+
+  # clear variables we append to (avoids possible polution from parent scopes)
+  set(implicit_dirs_tmp)
+  set(log "")
+
+  # go through each line of output...
+  string(REGEX REPLACE "\r?\n" ";" output_lines "${text}")
+  foreach(line IN LISTS output_lines)
+    if(state STREQUAL start)
+      string(FIND "${line}" "#include <...> search starts here:" rv)
+      if(rv GREATER -1)
+        set(state loading)
+        string(APPEND log "  found start of implicit include info\n")
+      else()
+        cmake_parse_implicit_include_line("${line}" "${lang}" implicit_dirs_tmp
+                                          linelog state)
+        if(linelog)
+          string(APPEND log ${linelog})
+        endif()
+        if(state STREQUAL done)
+          break()
+        endif()
+      endif()
+    elseif(state STREQUAL loading)
+      string(FIND "${line}" "End of search list." rv)
+      if(rv GREATER -1)
+        set(state done)
+        string(APPEND log "  end of search list found\n")
+        break()
+      else()
+        string(STRIP "${line}" path)     # remove leading/trailing spaces
+        if ("${path}" MATCHES " \\(framework directory\\)$")
+          continue() # frameworks are handled elsewhere, ignore them here
+        endif()
+        string(REPLACE "\\" "/" path "${path}")
+        list(APPEND implicit_dirs_tmp "${path}")
+        string(APPEND log "    add: [${path}]\n")
+      endif()
+    endif()
+  endforeach()
+
+  # Log results.
+  if(state STREQUAL done)
+    string(APPEND log "  implicit include dirs: [${implicit_dirs_tmp}]\n")
+  else()
+    string(APPEND log "  warn: unable to parse implicit include dirs!\n")
+  endif()
+
+  # Return results.
+  set(${dir_var} "${implicit_dirs_tmp}" PARENT_SCOPE)
+  set(${log_var} "${log}" PARENT_SCOPE)
+  set(${state_var} "${state}" PARENT_SCOPE)
+
+endfunction()