Detect a COMPILER_ID also for ASM.

For assembler, the "compiler ID" cannot be detected by "compiling" a
source file, since there is not source file all assemblers understand.
Instead the function CMAKE_DETERMINE_COMPILER_ID_VENDOR() is used to
run the assembler and check its output.
For this the CMAKE_DETERMINE_COMPILER_ID_VENDOR() function had to be
extended so that it creates the run directory if it doesn't exist yet.

In CMakeASMInformation.cmake now also CMAKE_ASM_COMPILER_ID is used
(but there are no such files yet, will come with the support for the
IAR toolchain).

Alex

Modules/CMakeASMInformation.cmake

@@ -28,18 +28,25 @@ IF("${CMAKE_BASE_NAME}" STREQUAL "as")
   SET(CMAKE_BASE_NAME gas)
 ENDIF("${CMAKE_BASE_NAME}" STREQUAL "as")
 
-INCLUDE(Platform/${CMAKE_BASE_NAME} OPTIONAL)
+# Load compiler-specific information.
+SET(_INCLUDED_FILE "")
+IF(CMAKE_ASM${ASM_DIALECT}_COMPILER_ID)
+  INCLUDE(Compiler/${CMAKE_ASM${ASM_DIALECT}_COMPILER_ID}-ASM${ASM_DIALECT} OPTIONAL  RESULT_VARIABLE _INCLUDED_FILE)
+ENDIF(CMAKE_ASM${ASM_DIALECT}_COMPILER_ID)
+IF(NOT _INCLUDED_FILE)
+  INCLUDE(Platform/${CMAKE_BASE_NAME} OPTIONAL)
+ENDIF(NOT _INCLUDED_FILE)
 
 IF(CMAKE_SYSTEM_PROCESSOR)
-  INCLUDE(Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_BASE_NAME}-${CMAKE_SYSTEM_PROCESSOR} OPTIONAL RESULT_VARIABLE _INCLUDED_FILE)
+  INCLUDE(Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_ASM${ASM_DIALECT}_COMPILER_ID}-ASM${ASM_DIALECT}-${CMAKE_SYSTEM_PROCESSOR} OPTIONAL  RESULT_VARIABLE _INCLUDED_FILE)
+  IF(NOT _INCLUDED_FILE)
+    INCLUDE(Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_BASE_NAME}-${CMAKE_SYSTEM_PROCESSOR} OPTIONAL)
+  ENDIF(NOT _INCLUDED_FILE)
 ENDIF(CMAKE_SYSTEM_PROCESSOR)
-IF(NOT _INCLUDED_FILE)
-  INCLUDE(Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_C_COMPILER_ID}-ASM-${CMAKE_SYSTEM_PROCESSOR} OPTIONAL)
-ENDIF(NOT _INCLUDED_FILE)
 
-INCLUDE(Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_BASE_NAME} OPTIONAL RESULT_VARIABLE _INCLUDED_FILE)
+INCLUDE(Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_ASM${ASM_DIALECT}_COMPILER_ID}-ASM${ASM_DIALECT} OPTIONAL  RESULT_VARIABLE _INCLUDED_FILE)
 IF(NOT _INCLUDED_FILE)
-  INCLUDE(Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_C_COMPILER_ID}-ASM OPTIONAL)
+  INCLUDE(Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_BASE_NAME} OPTIONAL)
 ENDIF(NOT _INCLUDED_FILE)
 
 # Set default assembler file extensions:

Modules/CMakeDetermineASMCompiler.cmake

@@ -57,6 +57,25 @@ IF (NOT _CMAKE_TOOLCHAIN_LOCATION)
   GET_FILENAME_COMPONENT(_CMAKE_TOOLCHAIN_LOCATION "${CMAKE_ASM${ASM_DIALECT}_COMPILER}" PATH)
 ENDIF (NOT _CMAKE_TOOLCHAIN_LOCATION)
 
+
+IF(NOT CMAKE_ASM${ASM_DIALECT}_COMPILER_ID)
+
+  # Table of per-vendor compiler id flags with expected output.
+  LIST(APPEND CMAKE_ASM${ASM_DIALECT}_COMPILER_ID_VENDORS GNU )
+  SET(CMAKE_ASM${ASM_DIALECT}_COMPILER_ID_VENDOR_FLAGS_GNU "--version")
+  SET(CMAKE_ASM${ASM_DIALECT}_COMPILER_ID_VENDOR_REGEX_GNU "GNU assembler")
+
+  CMAKE_DETERMINE_COMPILER_ID_VENDOR(ASM${ASM_DIALECT})
+
+  IF(CMAKE_ASM${ASM_DIALECT}_COMPILER_ID)
+    MESSAGE(STATUS "The ASM${ASM_DIALECT} compiler identification is ${CMAKE_ASM${ASM_DIALECT}_COMPILER_ID}")
+  ELSE(CMAKE_ASM${ASM_DIALECT}_COMPILER_ID)
+    MESSAGE(STATUS "The ASM${ASM_DIALECT} compiler identification is unknown")
+  ENDIF(CMAKE_ASM${ASM_DIALECT}_COMPILER_ID)
+
+ENDIF()
+
+
 # If we have a gas/as cross compiler, they have usually some prefix, like
 # e.g. powerpc-linux-gas, arm-elf-gas or i586-mingw32msvc-gas .
 # The other tools of the toolchain usually have the same prefix

Modules/CMakeDetermineCompilerId.cmake

@@ -261,6 +261,17 @@ ENDFUNCTION(CMAKE_DETERMINE_COMPILER_ID_CHECK lang)
 # We try running the compiler with the flag for each vendor and
 # matching its regular expression in the output.
 FUNCTION(CMAKE_DETERMINE_COMPILER_ID_VENDOR lang)
+
+  IF(NOT CMAKE_${lang}_COMPILER_ID_DIR)
+    # We get here when this function is called not from within CMAKE_DETERMINE_COMPILER_ID()
+    # This is done e.g. for detecting the compiler ID for assemblers.
+    # Compute the directory in which to run the test and Create a clean working directory.
+    SET(CMAKE_${lang}_COMPILER_ID_DIR ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CompilerId${lang})
+    FILE(REMOVE_RECURSE ${CMAKE_${lang}_COMPILER_ID_DIR})
+    FILE(MAKE_DIRECTORY ${CMAKE_${lang}_COMPILER_ID_DIR})
+  ENDIF(NOT CMAKE_${lang}_COMPILER_ID_DIR)
+
+
   FOREACH(vendor ${CMAKE_${lang}_COMPILER_ID_VENDORS})
     SET(flags ${CMAKE_${lang}_COMPILER_ID_VENDOR_FLAGS_${vendor}})
     SET(regex ${CMAKE_${lang}_COMPILER_ID_VENDOR_REGEX_${vendor}})