1 files changed, 72 insertions, 0 deletions
diff --git a/make_helpers/build_env.mk b/make_helpers/build_env.mk
new file mode 100644
index 0000000..83093bd
--- /dev/null
+++ b/make_helpers/build_env.mk
@@ -0,0 +1,72 @@
+#
+# Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+# This file contains the logic to identify and include any relevant
+# build environment specific make include files.
+
+ifndef BUILD_ENV_MK
+    BUILD_ENV_MK        :=      $(lastword $(MAKEFILE_LIST))
+
+    # Block possible built-in command definitions that are not fully portable.
+    # This traps occurences that need replacing with our OS portable macros
+    COPY                :=      $$(error "Replace COPY with call to SHELL_COPY or SHELL_COPY_TREE.")
+    CP                  :=      $$(error "Replace CP with call to SHELL_COPY or SHELL_COPY_TREE.")
+    DEL                 :=      $$(error "Replace DEL with call to SHELL_DELETE.")
+    MD                  :=      $$(error "Replace MD with call to MAKE_PREREQ_DIR.")
+    MKDIR               :=      $$(error "Replace MKDIR with call to MAKE_PREREQ_DIR.")
+    RD                  :=      $$(error "Replace RD with call to SHELL_REMOVE_DIR.")
+    RM                  :=      $$(error "Replace RM with call to SHELL_DELETE.")
+    RMDIR               :=      $$(error "Replace RMDIR with call to SHELL_REMOVE_DIR.")
+
+    ENV_FILE_TO_INCLUDE := unix.mk
+    ifdef OSTYPE
+        ifneq ($(findstring ${OSTYPE}, cygwin),)
+            ENV_FILE_TO_INCLUDE := cygwin.mk
+        else
+            ifneq ($(findstring ${OSTYPE}, MINGW32 mingw msys),)
+                ENV_FILE_TO_INCLUDE := msys.mk
+            endif
+        endif
+    else
+        ifdef MSYSTEM
+            # Although the MINGW MSYS shell sets OSTYPE as msys in its environment,
+            # it does not appear in the GNU make view of environment variables.
+            # We use MSYSTEM as an alternative, as that is seen by make
+            ifneq ($(findstring ${MSYSTEM}, MINGW32 mingw msys),)
+                OSTYPE ?= msys
+                ENV_FILE_TO_INCLUDE := msys.mk
+            endif
+        else
+            ifdef OS
+                ifneq ($(findstring ${OS}, Windows_NT),)
+                    ENV_FILE_TO_INCLUDE := windows.mk
+                endif
+            endif
+        endif
+    endif
+    include ${MAKE_HELPERS_DIRECTORY}${ENV_FILE_TO_INCLUDE}
+    ENV_FILE_TO_INCLUDE :=
+
+    ifndef SHELL_COPY
+        $(error "SHELL_COPY not defined for build environment.")
+    endif
+    ifndef SHELL_COPY_TREE
+        $(error "SHELL_COPY_TREE not defined for build environment.")
+    endif
+    ifndef SHELL_DELETE_ALL
+        $(error "SHELL_DELETE_ALL not defined for build environment.")
+    endif
+    ifndef SHELL_DELETE
+        $(error "SHELL_DELETE not defined for build environment.")
+    endif
+    ifndef MAKE_PREREQ_DIR
+        $(error "MAKE_PREREQ_DIR not defined for build environment.")
+    endif
+    ifndef SHELL_REMOVE_DIR
+        $(error "SHELL_REMOVE_DIR not defined for build environment.")
+    endif
+
+endif