Add support for the ARM Compiler (arm.com)

Create an `ARMCC` compiler id corresponding to compilers identified and
versioned by the `__ARMCC_VERSION` predefined macro.  See documentation
for the compilers at

 http://infocenter.arm.com/help/topic/com.arm.doc.set.swdev/index.html

Help/variable/CMAKE_LANG_COMPILER_ID.rst

@@ -11,6 +11,7 @@ include:
   Absoft = Absoft Fortran (absoft.com)
   ADSP = Analog VisualDSP++ (analog.com)
   AppleClang = Apple Clang (apple.com)
+  ARMCC = ARM Compiler (arm.com)
   CCur = Concurrent Fortran (ccur.com)
   Clang = LLVM Clang (clang.llvm.org)
   Cray = Cray Compiler (cray.com)

Modules/CMakeCompilerIdDetection.cmake

@@ -89,6 +89,7 @@ function(compiler_id_detection outvar lang)
       MSVC
       ADSP
       IAR
+      ARMCC
     )
     if (lang STREQUAL C)
       list(APPEND ordered_compilers

Modules/CMakeDetermineASMCompiler.cmake

@@ -92,6 +92,10 @@ if(NOT CMAKE_ASM${ASM_DIALECT}_COMPILER_ID)
   set(CMAKE_ASM${ASM_DIALECT}_COMPILER_ID_VENDOR_FLAGS_IAR )
   set(CMAKE_ASM${ASM_DIALECT}_COMPILER_ID_VENDOR_REGEX_IAR "IAR Assembler")
 
+  list(APPEND CMAKE_ASM${ASM_DIALECT}_COMPILER_ID_VENDORS ARMCC)
+  set(CMAKE_ASM${ASM_DIALECT}_COMPILER_ID_VENDOR_FLAGS_ARMCC )
+  set(CMAKE_ASM${ASM_DIALECT}_COMPILER_ID_VENDOR_REGEX_ARMCC "(ARM Compiler)|(ARM Assembler)")
+
   include(CMakeDetermineCompilerId)
   CMAKE_DETERMINE_COMPILER_ID_VENDOR(ASM${ASM_DIALECT})
 

Modules/Compiler/ARMCC-ASM.cmake

+include(Compiler/ARMCC)
+
+set(CMAKE_ASM_OUTPUT_EXTENSION ".o")
+set(CMAKE_ASM_OUTPUT_EXTENSION_REPLACE 1)
+
+set(CMAKE_ASM_COMPILE_OBJECT       "<CMAKE_ASM_COMPILER> <FLAGS> -o <OBJECT> <SOURCE>")
+set(CMAKE_ASM_SOURCE_FILE_EXTENSIONS s;asm;msa)

Modules/Compiler/ARMCC-C.cmake

+include(Compiler/ARMCC)
+__compiler_armcc(C)

Modules/Compiler/ARMCC-CXX.cmake

+include(Compiler/ARMCC)
+__compiler_armcc(CXX)

Modules/Compiler/ARMCC-DetermineCompiler.cmake

+# ARMCC Toolchain
+set(_compiler_id_pp_test "defined(__ARMCC_VERSION)")
+
+set(_compiler_id_version_compute "
+#if __ARMCC_VERSION >= 1000000
+  /* __ARMCC_VERSION = VRRPPPP */
+  # define @PREFIX@COMPILER_VERSION_MAJOR @MACRO_DEC@(__ARMCC_VERSION/1000000)
+  # define @PREFIX@COMPILER_VERSION_MINOR @MACRO_DEC@(__ARMCC_VERSION/10000 % 100)
+  # define @PREFIX@COMPILER_VERSION_PATCH @MACRO_DEC@(__ARMCC_VERSION     % 10000)
+#else
+  /* __ARMCC_VERSION = VRPPPP */
+  # define @PREFIX@COMPILER_VERSION_MAJOR @MACRO_DEC@(__ARMCC_VERSION/100000)
+  # define @PREFIX@COMPILER_VERSION_MINOR @MACRO_DEC@(__ARMCC_VERSION/10000 % 10)
+  # define @PREFIX@COMPILER_VERSION_PATCH @MACRO_DEC@(__ARMCC_VERSION    % 10000)
+#endif
+")

Modules/Compiler/ARMCC.cmake

+if(_ARMCC_CMAKE_LOADED)
+  return()
+endif()
+set(_ARMCC_CMAKE_LOADED TRUE)
+
+# See ARM Compiler documentation at:
+# http://infocenter.arm.com/help/topic/com.arm.doc.set.swdev/index.html
+
+get_filename_component(_CMAKE_C_TOOLCHAIN_LOCATION "${CMAKE_C_COMPILER}" PATH)
+get_filename_component(_CMAKE_CXX_TOOLCHAIN_LOCATION "${CMAKE_CXX_COMPILER}" PATH)
+
+set(CMAKE_EXECUTABLE_SUFFIX ".elf")
+
+find_program(CMAKE_ARMCC_LINKER armlink HINTS "${_CMAKE_C_TOOLCHAIN_LOCATION}" "${_CMAKE_CXX_TOOLCHAIN_LOCATION}" )
+find_program(CMAKE_ARMCC_AR     armar   HINTS "${_CMAKE_C_TOOLCHAIN_LOCATION}" "${_CMAKE_CXX_TOOLCHAIN_LOCATION}" )
+
+set(CMAKE_LINKER "${CMAKE_ARMCC_LINKER}" CACHE FILEPATH "The ARMCC linker" FORCE)
+mark_as_advanced(CMAKE_ARMCC_LINKER)
+set(CMAKE_AR "${CMAKE_ARMCC_AR}" CACHE FILEPATH "The ARMCC archiver" FORCE)
+mark_as_advanced(CMAKE_ARMCC_AR)
+
+macro(__compiler_armcc lang)
+  set(CMAKE_${lang}_FLAGS_INIT "")
+  set(CMAKE_${lang}_FLAGS_DEBUG_INIT "-g")
+  set(CMAKE_${lang}_FLAGS_MINSIZEREL_INIT "-Ospace -DNDEBUG")
+  set(CMAKE_${lang}_FLAGS_RELEASE_INIT "-Otime -DNDEBUG")
+  set(CMAKE_${lang}_FLAGS_RELWITHDEBINFO_INIT "-O2 -g")
+
+  set(CMAKE_${lang}_OUTPUT_EXTENSION ".o")
+  set(CMAKE_${lang}_OUTPUT_EXTENSION_REPLACE 1)
+
+  set(CMAKE_${lang}_LINK_EXECUTABLE      "<CMAKE_LINKER> <CMAKE_${lang}_LINK_FLAGS> <LINK_FLAGS> <LINK_LIBRARIES> <OBJECTS> -o <TARGET> --list <TARGET_BASE>.map")
+  set(CMAKE_${lang}_CREATE_STATIC_LIBRARY  "<CMAKE_AR> --create -cr <TARGET> <LINK_FLAGS> <OBJECTS>")
+
+  set(CMAKE_DEPFILE_FLAGS_${lang} "--depend=<DEPFILE> --depend_single_line --no_depend_system_headers")
+endmacro()