#9421: Problems and workarounds when installing and using a 32bit GHC on 64bit Linux machine -------------------------------------+------------------------------------- Reporter: | Owner: MikolajKonarski MikolajKonarski | Status: new Type: bug | Milestone: Priority: normal | Version: 7.8.3 Component: Compiler | Keywords: Resolution: | Architecture: x86_64 (amd64) Operating System: Linux | Difficulty: Unknown Type of failure: Installing | Blocked By: GHC failed | Related Tickets: Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Comment (by MikolajKonarski): I tried investigating why cabal ignores {{{"ld flags"}}} from the {{{$PREFIX/lib/ghc-7.8.3/settings}}} file. Cabal doesn't now about {{{"ld flags"}}}, but it does know about {{{"Ld Linker flags"}}}. However, just setting {{{"Ld Linker flags"}}} in the file doesn't help. I code-dived in GHC and it mentions each of the keys exactly once: in the template for the settings file {{{ settings.in: ("ld flags", "@SettingsLdFlags@"), }}} and when dealing with commandline arguments {{{ ghc/Main.hs-mode_flags = [...] ghc/Main.hs- [ Flag k' (PassFlag (setMode (printSetting k))) ghc/Main.hs- | k <- ["Project version", [...] ghc/Main.hs: "Ld Linker flags"], }}} It seems the two keys are different things, from different namespaces --- almost all of the keys in {{{ghc/Main.h}}} differ from their {{{settings.in}}} wording. BTW, there is also a single possibily relevant comment in the cabal source code, but I hope the part about ld is outdated and, anyway, I don't understand it: {{{ Cabal/Distribution/Simple.hs- -- The C compiler's compilation and linker flags (e.g. Cabal/Distribution/Simple.hs: -- "C compiler flags" and "Gcc Linker flags" from GHC) have already Cabal/Distribution/Simple.hs- -- been merged into ccFlags, so we set both CFLAGS and LDFLAGS Cabal/Distribution/Simple.hs- -- to ccFlags Cabal/Distribution/Simple.hs- -- We don't try and tell configure which ld to use, as we don't have Cabal/Distribution/Simple.hs- -- a way to pass its flags too }}} Looking at GHC code for other settings, I'd guess that GHC may not read and merge {{{"ld flags"}}} with other ld options (perhaps because it doesn't call ld, but cabal does?). And so cabal doesn't learn this part of ld setting from GHC. But the GHC source code naming of the gcc linker flags and the /usr/bin/ld flags is not easy to follow and sometimes the gcc linker flags seem to be used for the system linker, etc., so it's not obvious to me if GHC or cabal is to blame or both. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9421#comment:15 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler