Repository : ssh://darcs.haskell.org//srv/darcs/ghc On branch : master
http://hackage.haskell.org/trac/ghc/changeset/330769c9ca21c2fb37e8273283832ec0e9a6c117 >--------------------------------------------------------------- commit 330769c9ca21c2fb37e8273283832ec0e9a6c117 Author: Simon Marlow <[email protected]> Date: Mon Jul 2 14:52:12 2012 +0100 Add a Note, copying text from #2437 >--------------------------------------------------------------- compiler/ghci/Linker.lhs | 28 +++++++++++++++++++++++++++- 1 files changed, 27 insertions(+), 1 deletions(-) diff --git a/compiler/ghci/Linker.lhs b/compiler/ghci/Linker.lhs index a16832b..06096c3 100644 --- a/compiler/ghci/Linker.lhs +++ b/compiler/ghci/Linker.lhs @@ -287,7 +287,7 @@ reallyInitDynLinker dflags = -- (a) initialise the C dynamic linker ; initObjLinker - -- (b) Load packages from the command-line + -- (b) Load packages from the command-line (Note [preload packages]) ; pls <- linkPackages' dflags (preloadPackages (pkgState dflags)) pls0 -- (c) Link libraries from the command-line @@ -325,6 +325,32 @@ reallyInitDynLinker dflags = ; return pls }} + +{- Note [preload packages] + +Why do we need to preload packages from the command line? This is an +explanation copied from #2437: + +I tried to implement the suggestion from #3560, thinking it would be +easy, but there are two reasons we link in packages eagerly when they +are mentioned on the command line: + + * So that you can link in extra object files or libraries that + depend on the packages. e.g. ghc -package foo -lbar where bar is a + C library that depends on something in foo. So we could link in + foo eagerly if and only if there are extra C libs or objects to + link in, but.... + + * Haskell code can depend on a C function exported by a package, and + the normal dependency tracking that TH uses can't know about these + dependencies. The test ghcilink004 relies on this, for example. + +I conclude that we need two -package flags: one that says "this is a +package I want to make available", and one that says "this is a +package I want to link in eagerly". Would that be too complicated for +users? +-} + classifyLdInput :: DynFlags -> FilePath -> IO (Maybe LibrarySpec) classifyLdInput dflags f | isObjectFilename f = return (Just (Object f)) _______________________________________________ Cvs-ghc mailing list [email protected] http://www.haskell.org/mailman/listinfo/cvs-ghc
