#13491: UNIQUE_BITS is not crosscompiler-friendly -------------------------------------+------------------------------------- Reporter: slyfox | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- Things break when I try to build crosscompiler from 32-bit system to 64-bit system. For example i386-linux -> powerpc64-linux: {{{ $ ./configure --target=powerpc64-unknown-linux-gnu --with-system-libffi --with-libffi-includes=/usr/lib/libffi-3.2.1/include/ $ make "inplace/bin/ghc-stage1" -static -H32m -O -optc-I/usr/lib/libffi-3.2.1/include -Wall -Iincludes -Iincludes/dist -Iincludes/dist-derivedconstants/header -Iincludes/dist- ghcconstants/header -Irts -Irts/dist/build -DCOMPILING_RTS -this-unit-id rts -dcmm-lint -i -irts -irts/dist/build -Irts/dist/build -irts/dist/build/./autogen -Irts/dist/build/./autogen -O2 -Wno ncanonical-monad-instances -c rts/StgStartup.cmm -o rts/dist/build/StgStartup.o /tmp/ghc19687_0/ghc_4.s: Assembler messages: /tmp/ghc19687_0/ghc_4.s:11:0: error: Error: unknown pseudo-op: `.l' | 11 | .L�4: | ^ }}} The problem here comes from definition of `UNIQUE_BITS`: {{{#!hs # cat compiler/Unique.h #include "../includes/MachDeps.h" #define UNIQUE_BITS (WORD_SIZE_IN_BITS - 8) }}} Here `WORD_SIZE_IN_BITS` is a target platform size (64) while `stage1` is still running on host platform (32). As a result uniques truncate down to zero: {{{#!hs compiler/basicTypes/Unique.hs: tag = ord c `shiftL` UNIQUE_BITS compiler/basicTypes/Unique.hs: tag = chr (u `shiftR` UNIQUE_BITS) }}} As we operate on host '''Int'''s we could use the following: {{{#!hs #define UNIQUE_BITS sizeof(HsInt) * 8 -- C code #define UNIQUE_BITS (finiteBitSize (undefined :: Int) * 8) -- Haskell code }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13491 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler