Make:Use environment variables for OS detection.
Add make helper files to select the appropriate settings for the build
environment. Selection is made in make_helpers/build_env.mk, which
selects other files to include using generic build environment settings.
The Trusted Firmware Makefile and supporting tool Makefiles are updated
to include build_env.mk instead of unix.mk.
NOTE: This change does not fully enable builds in other build
environments. It facilitates this without compromising the
existing build environments.
Change-Id: Ic4064ffe6ce158bbd16d7cc9f27dd4655a3580f6
diff --git a/make_helpers/build_env.mk b/make_helpers/build_env.mk
new file mode 100644
index 0000000..62c7f68
--- /dev/null
+++ b/make_helpers/build_env.mk
@@ -0,0 +1,96 @@
+#
+# Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+# Redistributions of source code must retain the above copyright notice, this
+# list of conditions and the following disclaimer.
+#
+# Redistributions in binary form must reproduce the above copyright notice,
+# this list of conditions and the following disclaimer in the documentation
+# and/or other materials provided with the distribution.
+#
+# Neither the name of ARM nor the names of its contributors may be used
+# to endorse or promote products derived from this software without specific
+# prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+
+# 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