#15848: ghc builds cbits with -fPIC even when -fPIC is not passed to ghc on linux ----------------------------------------+--------------------------------- Reporter: watashi | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Driver | Version: 8.7 Keywords: | Operating System: Linux Architecture: Unknown/Multiple | Type of failure: None/Unknown Test Case: | Blocked By: Blocking: | Related Tickets: #15847 Differential Rev(s): | Wiki Page: ----------------------------------------+--------------------------------- ghc assumes that on linux, C compiler (e.g. gcc) will build non-PIC object code when no `-fPIC` is passed. But this is no longer true for recent gcc version on some distributions. e.g. {{{ $ uname -a Linux watashi-arch32 4.18.5-arch1-1.0-ARCH #1 SMP PREEMPT Tue Aug 28 20:45:30 CEST 2018 i686 GNU/Linux $ gcc --version gcc (GCC) 7.3.1 20180312 $ touch dummy.c $ gcc -Q -v dummy.c 2>&1 | grep PIC options enabled: -fPIC -fPIE -faggressive-loop-optimizations }}} We need pass `-fno-PIC` explicitly just like `-no-pie`. In particular, this results in 300+ ext-interp related tests to fail on i386 when built with a gcc that has `-fPIC` on by default, as we don't support loading non-PIC .o built from .c on i386. (See #15847, fix this bug will mitigate #15847) -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15848 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler