#12748: BFD linker issue with GHCi -------------------------------------+------------------------------------- Reporter: hsyl20 | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 (Linking) | Keywords: Resolution: | bfd,linker,ghci Operating System: Linux | Architecture: | Unknown/Multiple Type of failure: GHCi crash | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by hsyl20): * cc: bgamari (added) Comment: I may have found the culprit. While investigating #12754, I obtained these results: {{{ 8.0.1 HEAD HEAD (disable mkTypeableBinds) Compile time (without export list): 13.16 15.16s 12.19 -20% Compile time (with export list): 10.24s 12.06s 9.16 -24% Binary size: 5.4M 5.4M 2.5M -53% Interface size: 888K 1.1M 498K -55% #symbols in .symtab: 60034 60034 30017 -50% #relocs in .rela.data: 60024 60024 10002 -83% Size of .data section: 720272 720272 80016 -89% Size of .strtab section: 887100 887100 447902 -50% }}} For each type constructor, `mkTypeableBinds` adds: * The name of the constructor as a string into .rodata * + 1 symbol * n bytes, 8-byte aligned (there are two consecutives directives: `.align 8 .align 1` before each string) * A `GHC.Types.TrNameS` closure in .data * + 1 symbol * 8 bytes, 8-byte aligned too * A `GHC.Types.TyCon` closure in .data * + 1 symbol * 24 bytes, 8-byte aligned too -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12748#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler