Macho-embedded: update build script for newer Clang behaviour.

Clang now uses the *-apple-macho triples for embedded targets using MachO. The
environment makes less pretences to be running an actual Mach kernel with all
the support that would imply, so a few changes are needed to the build scripts:
    
+ The Apple way of detecting endianness applies in all cases so drop the
  __MACH__ test.
+ A quick rename since "darwin_embedded" no longer makes any sense. If there's
  no Mach going on, there's certainly no Darwin.
+ Change how we test for support for a platform. The functions we build don't
  need any SDK support (stdio.h, ...) so we don't need to check for it.

llvm-svn: 199731

compiler-rt/lib/int_endianness.h

@@ -62,7 +62,7 @@
 /* .. */
 
 /* Mac OSX has __BIG_ENDIAN__ or __LITTLE_ENDIAN__ automatically set by the compiler (at least with GCC) */
-#if defined(__APPLE__) && defined(__MACH__) || defined(__ellcc__ )
+#if defined(__APPLE__) || defined(__ellcc__ )
 
 #ifdef __BIG_ENDIAN__
 #if __BIG_ENDIAN__

compiler-rt/make/platform/clang_macho_embedded.mk

@@ -14,13 +14,12 @@ CheckArches = \
     for arch in $(1); do \
       if $(CC) -arch $$arch -c \
 	  -integrated-as \
-	  $(ProjSrcRoot)/make/platform/clang_darwin_test_input.c \
-	  -isysroot $(ProjSrcRoot)/SDKs/darwin \
+	  $(ProjSrcRoot)/make/platform/clang_macho_embedded_test_input.c \
 	  -o /dev/null > /dev/null 2> /dev/null; then \
         result="$$result$$arch "; \
       else \
 	printf 1>&2 \
-	  "warning: clang_darwin.mk: dropping arch '$$arch' from lib '$(2)'\n"; \
+	  "warning: clang_macho_embedded.mk: dropping arch '$$arch' from lib '$(2)'\n"; \
       fi; \
     done; \
     echo $$result)