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secondary targets are gone, simplify this.

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llvm-svn: 48067
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Chris Lattner 2008-03-09 01:36:43 +00:00
parent 22ad07ca07
commit e4a6b18c2e
1 changed files with 5 additions and 33 deletions
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38
clang/NOTES.txt
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@ -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.