#13531: GHC fails with "Dynamic linker not initialised" when -j is on and trying to load nonexistent .so file -------------------------------------+------------------------------------- Reporter: nh2 | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.2 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: Compile-time Unknown/Multiple | crash or panic Test Case: | Blocked By: Blocking: | Related Tickets: #13137, #9868, | #10355 Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- For ghc 8.0.2 (on Linux, in nixpkgs `0c041520c3` for exact reproducibility), when TH is used in a `ghc --make -j1` invocation, and thus ghc does the whole {{{ cc -fno-stack-protector -DTABLES_NEXT_TO_CODE '-std=c++14' -Wno- deprecated-declarations --print-file-name liblibglog.so Loading object (dynamic) glog ... done }}} business, and the `.so` file in question does not exist, then usually GHC prints {{{ <command line>: user specified .o/.so/.DLL could not be loaded (libglog.so: cannot open shared object file: No such file or directory) }}} However, I found that when parallel compilation is enabled, (e.g. `ghc -j4`), I can get this instead: {{{ [ 23 of 130] Compiling Mymodule ( Mymodule.hs, dist/build/Mymodule.o ) <no location info>: error: ghc: panic! (the 'impossible' happened) (GHC version 8.0.2 for x86_64-unknown-linux): Dynamic linker not initialised Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13531 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler