Return the architecture by probing predefined compiler macros

llvm-svn: 225789

1 files changed, 67 insertions, 0 deletions

diff --git a/openmp/runtime/cmake/GetArchitecture.cmake b/openmp/runtime/cmake/GetArchitecture.cmake
new file mode 100644
index 00000000000..3b74bc0f80f
--- /dev/null
+++ b/openmp/runtime/cmake/GetArchitecture.cmake
@@ -0,0 +1,67 @@
+#
+#//===----------------------------------------------------------------------===//
+#//
+#//                     The LLVM Compiler Infrastructure
+#//
+#// This file is dual licensed under the MIT and the University of Illinois Open
+#// Source Licenses. See LICENSE.txt for details.
+#//
+#//===----------------------------------------------------------------------===//
+#
+
+# Determine the architecture from predefined compiler macros
+# The architecture name can only contain alphanumeric characters and underscores (i.e., C identifier)
+
+# void get_architecture(string* return_arch)
+# - Returns the architecture in return_arch
+function(get_architecture return_arch)
+    set(detect_arch_src_txt "
+    #if defined(__KNC__)
+        #error ARCHITECTURE=mic
+    #elif defined(__amd64__) || defined(__amd64) || defined(__x86_64__) || defined(__x86_64) || defined(_M_X64) || defined(_M_AMD64)
+        #error ARCHITECTURE=32e
+    #elif defined(__i386) || defined(__i386__) || defined(__IA32__) || defined(_M_I86) || defined(_M_IX86) || defined(__X86__) || defined(_X86_)
+        #error ARCHITECTURE=32
+    #elif defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_7R__) ||  defined(__ARM_ARCH_7A__) || defined(__ARM_ARCH_7M__)  || defined(__ARM_ARCH_7S__)
+        #error ARCHITECTURE=arm
+    #elif defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) || defined(__ARM_ARCH_6K__)  || defined(__ARM_ARCH_6Z__)  || defined(__ARM_ARCH_6T2__) || defined(__ARM_ARCH_6ZK__)
+        #error ARCHITECTURE=arm
+    #elif defined(__ARM_ARCH_5__) || defined(__ARM_ARCH_5T__) || defined(__ARM_ARCH_5E__)  || defined(__ARM_ARCH_5TE__) || defined(__ARM_ARCH_5TEJ__)
+        #error ARCHITECTURE=arm
+    #elif defined(__ARM_ARCH_4__) || defined(__ARM_ARCH_4T__) 
+        #error ARCHITECTURE=arm
+    #elif defined(__ARM_ARCH_3__) || defined(__ARM_ARCH_3M__)
+        #error ARCHITECTURE=arm
+    #elif defined(__ARM_ARCH_2__)
+        #error ARCHITECTURE=arm
+    #elif defined(__arm__) || defined(_M_ARM) || defined(_ARM)
+        #error ARCHITECTURE=arm
+    #elif defined(__aarch64__)
+        #error ARCHITECTURE=aarch64
+    #elif defined(__powerpc64__) && defined(__LITTLE_ENDIAN__)
+        #error ARCHITECTURE=ppc64le
+    #elif defined(__powerpc64__)
+        #error ARCHITECTURE=ppc64
+    #else
+        #error ARCHITECTURE=UnknownArchitecture
+    #endif
+    "
+    )
+    # Write out ${detect_arch_src_txt} to a file within the cmake/ subdirectory
+    file(WRITE "${LIBOMP_WORK}/cmake/detect_arch.c" ${detect_arch_src_txt}) 
+
+    # Try to compile using the C Compiler.  It will always error out with an #error directive, so store error output to ${local_architecture}
+    try_run(run_dummy compile_dummy "${CMAKE_CURRENT_BINARY_DIR}" "${LIBOMP_WORK}/cmake/detect_arch.c" COMPILE_OUTPUT_VARIABLE local_architecture)
+
+    # Match the important architecture line and store only that matching string in ${local_architecture}
+    string(REGEX MATCH "ARCHITECTURE=([a-zA-Z0-9_]+)" local_architecture "${local_architecture}")
+
+    # Get rid of the ARCHITECTURE= part of the string
+    string(REPLACE "ARCHITECTURE=" "" local_architecture "${local_architecture}")
+
+    # set the return value to the architecture detected (e.g., 32e, 32, arm, ppc64, etc.)
+    set(${return_arch} "${local_architecture}" PARENT_SCOPE)
+
+    # Remove ${detect_arch_src_txt} from cmake/ subdirectory
+    file(REMOVE "${LIBOMP_WORK}/cmake/detect_arch.c")
+endfunction()