cmake: Add gcc support
This commit adds the option to cmake to build TF-M with GCC.
Change-Id: I7a5e3c915efa61620f1f0d34ed42cba5c174c562
Signed-off-by: Mate Toth-Pal <mate.toth-pal@arm.com>
diff --git a/cmake/Common/GNUArMerge.cmake b/cmake/Common/GNUArMerge.cmake
new file mode 100644
index 0000000..8631e6c
--- /dev/null
+++ b/cmake/Common/GNUArMerge.cmake
@@ -0,0 +1,120 @@
+#-------------------------------------------------------------------------------
+# Copyright (c) 2018, Arm Limited. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+#-------------------------------------------------------------------------------
+
+#A cmake script to merge two archives using GNU AR.
+#
+# The script will first run AR to get the list of files in the source archive.
+# Then each file is:
+# -extracted
+# -added to the target archive
+# -deleted
+#
+# The loop is needed to avoid losing files with matching name in the source
+# archive.
+# The destination archive is updated in a way not to overwrite existing files
+# with matching names.
+#
+#Examples:
+# cmake -DCMAKE_AR=arm-none-eabi-ar -DDESTINATION=new_lib.a -DSOURCE=/foo/bar/old_lib.a -P ./GNUArMerge.cmake
+#
+#Parameters:
+# SOURCE - archive file to copy all members from
+# DESTINATION - archive file to copy members to. If file exists, then new
+# members are added without overwriting existing ones.
+# CMAKE_AR - GNU AR executable
+#
+
+#Execute AR and capture its output
+#
+# Script execution will stop with a fatal error if AR execution fails.
+#
+#Examples:
+# List content of archive:
+# run_ar(RESULT t /foo/bar/my_lib.a)
+# Add object file to archive
+# run_ar(RESULT q /foo/bar/my_lib.a new_obj.o)
+#
+#INPUTS:
+# RESULT - (mandatory) - name of variable to put result in
+# All remaining parameters will be command line options to AR
+#
+#OUTPUTS
+# RESULT - text output of AR command
+#
+function(run_ar OUTPUT )
+ execute_process(COMMAND ${CMAKE_AR} ${ARGN}
+ TIMEOUT 120
+ OUTPUT_VARIABLE _RES
+ RESULT_VARIABLE _STATUS_CODE
+ OUTPUT_STRIP_TRAILING_WHITESPACE)
+
+ if (STATUS_CODE GREATER 0)
+ message(FATAL_ERROR "ERROR: Failed to execute \"${CMAKE_AR} ${ARGN}\".")
+ endif()
+ set(${OUTPUT} ${_RES} PARENT_SCOPE)
+endfunction()
+
+#Delete a file
+#
+# Function to delete a file. No error will be reported if file is missing.
+# Script execution will stop with a fatal error if AR execution fails.
+#
+#Examples:
+# rm(/foo/bar/my_lib.a)
+#
+#INPUTS:
+# FILE - path to file to delete
+#
+#OUTPUTS
+# N/A
+#
+function(rm FILE)
+ execute_process(COMMAND ${CMAKE_COMMAND} -E remove ${FILE}
+ RESULT_VARIABLE _STATUS_CODE
+ TIMEOUT 120)
+ if (STATUS_CODE GREATER 0)
+ message(FATAL_ERROR "ERROR: Failed to execute \"${CMAKE_COMMAND} -E remove ${FILE}\".")
+ endif()
+endfunction()
+
+
+#############################################################################
+# Entry point
+#############################################################################
+#Verify input variables.
+
+if(NOT DEFINED SOURCE)
+ message(FATAL_ERROR "GNUArMerge.cmake: Variable SOURCE is not defined.")
+endif()
+
+if(NOT DEFINED DESTINATION)
+ message(FATAL_ERROR "GNUArMerge.cmake: Variable DESTINATION is not defined.")
+endif()
+
+if(NOT DEFINED CMAKE_AR)
+ message(FATAL_ERROR "GNUArMerge.cmake: Variable CMAKE_AR is not defined.")
+endif()
+
+
+#Get list of archive members
+run_ar("OBJ_LIST" t ${SOURCE})
+
+#Convert AR output to cmake list
+string(REPLACE "\n" ";" OBJ_LIST ${OBJ_LIST})
+
+#Iterate over member list.
+foreach(OBJ ${OBJ_LIST})
+ #Extract member
+ run_ar("_DUMMY" x ${SOURCE} ${OBJ})
+ #Add member to destination archive
+ run_ar("_DUMMY" q ${DESTINATION} ${OBJ})
+ #Remove extracted member
+ rm("${OBJ}")
+endforeach()
+
+#Update the symbol table
+run_ar("_DUMMY" s ${DESTINATION})