#8713: Avoid libraries if unneeded (librt, libdl, libpthread) -------------------------------------+------------------------------------- Reporter: ip1981 | Owner: Type: bug | Status: upstream Priority: normal | Milestone: Component: GHCi | Version: 7.6.3 Resolution: | Keywords: Operating System: Other | Architecture: x86_64 (amd64) Type of failure: GHCi crash | Difficulty: Moderate (less Test Case: | than a day) Blocking: | Blocked By: Differential Revisions: | Related Tickets: -------------------------------------+------------------------------------- Comment (by ip1981): Hi, this changes won't affect solaris. The patch make GHC only check whether we need libdl or libpthread. If not it will not load them. On Solaris libdl is a filter library. It exists only for backward compatibility. dlopen() function really is not even in libc, but in runtime linker ld.so. As for Dyson hack: I use GNU binutils. I had linker (GNU ld) problems when linking filter libraries, e. g. symbols versions mismach or so, can't remember. In come cases I was not able to link libpthread.so or librt.so. But on Solaris, illumos and Dyson I don't need to, because all functions are in libc (ld.so) Unfortunately, many (== almost all ;-) packages does not check whether they need these libraries, some of packages link them unconditionally, e. g. gcc -ldl -lpthread, etc. So instead of using real symlinks like libdl.so -> libdl.so.1, I made libdl.so be a file with [GNU] linker script with does nothing. Thus every package is happy finding these libs, and I don't have linking errors. In the ideal world GHC should load real library, not a developer symlink, e. i. libdl.so.1 instead of just libdl.so. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8713#comment:9 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler