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Added some notes on the -triple and -arch options.

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llvm-svn: 44554
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Ted Kremenek 2007-12-03 22:26:16 +00:00
parent d0d2bd5089
commit 8cdc08ea49
1 changed files with 41 additions and 0 deletions
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clang/NOTES.txt
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@ -119,6 +119,47 @@ TODO: New language feature: Configuration queries:
- Use it to increase the number of "architecture-clean" #import'd files,
allowing a single index to be used for all fat slices.
//===---------------------------------------------------------------------===//
// 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 "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).
//===---------------------------------------------------------------------===//
The 'portability' model in clang is sufficient to catch translation units (or