secondary targets are gone, simplify this.

llvm-svn: 48067

Author: lattner

clang/NOTES.txt

@@ -102,39 +102,11 @@ TODO: New language feature: Configuration queries:
 // Specifying targets:  -triple and -arch
 ===---------------------------------------------------------------------===//
 
-The clang supports "-triple" and "-arch" options. At most one -triple option may
-be specified, while multiple -arch options can be specified. Both are optional.
+The clang supports "-triple" and "-arch" options. At most one -triple and one
+-arch option may be specified.  Both are optional.
 
 The "selection of target" behavior is defined as follows:
 
-(1) If the user does not specify -triple:
-
-  (a) If no -arch options are specified, the target triple used is the host
-      triple (in llvm/Config/config.h).
-
-  (b) If one or more -arch's are specified (and no -triple), then there is
-      one triple for each -arch, where the specified arch is substituted
-      for the arch in the host triple.  Example:
-
-         host triple = i686-apple-darwin9
-         command: clang  -arch ppc -arch ppc64 ...
-         triples used: ppc-apple-darwin9  ppc64-apple-darwin9
-
-(2) The user does specify a -triple (only one allowed):
-
-  (a) If no -arch options are specified, the triple specified by -triple
-      is used.  E.g clang -triple i686-apple-darwin9
-
-  (b) If one or more -arch options are specified, then the triple specified
-      by -triple is used as the primary target, and the arch's specified
-      by -arch are used to create secondary targets.  For example:
-
-      clang -triple i686-apple-darwin9 -arch ppc -arch ppc64
-
-      has the following targets:
-
-         i686-apple-darwin9  (primary target)
-         ppc-apple-darwin9   (secondary target)
-         ppc64-apple-darwin9 (secondary target)
-
-The secondary targets are used in the 'portability' model (see below).
+(1) If the user does not specify -triple, we default to the host triple.
+(2) If the user specifies a -arch, that overrides the arch in the host or
+    specified triple.