Marius Bakke <mba...@fastmail.com> writes: > Hello, > > On the 'core-updates' branch, GHC 8.6.5 consistently fails a single > test: > > =====> T13702(normal) 1219 of 6523 [0, 0, 0] > cd "./dynlibs/T13702.run" && $MAKE --no-print-directory -s T13702 > Wrong exit code for T13702()(expected 0 , actual 2 ) > Stdout ( T13702 ): > hello world > Stderr ( T13702 ): > T13702a: user error (dlopen: ./T13702: cannot dynamically load > position-independent executable) > make[2]: *** [Makefile:60: T13702] Error 1 > *** unexpected failure for T13702(normal) > > Here is the test in question: > > https://gitlab.haskell.org/ghc/ghc/blob/master/testsuite/tests/dynlibs/T13702.hs > > Initially I thought this has to do with the LibFFI 3.3 upgrade, but > reverting commit 5f1000d5d4cc4dfc9a1fe220457c17ad011d9e33 did not make a > difference.
This turned out to be because of a change in glibc 2.30, where dlopening a position-independent executable has been disallowed: https://sourceware.org/bugzilla/show_bug.cgi?id=24323 Test T13702 verifies that creating position-independent executables work, by running and dlopening one. Commit 2e9c43aa9adac2bd6bcf92373d1cf9f322afa5a3 attempted to disable test T13702a which dlopens it, but the build still failed: cd "./driver/recomp017/recomp017.run" && $MAKE -s --no-print-directory recomp017 --- ./dynlibs/T13702.run/T13702.stdout.normalised 2020-03-23 19:45:14.063130812 +0000 +++ ./dynlibs/T13702.run/T13702.run.stdout.normalised 2020-03-23 19:45:14.063130812 +0000 @@ -1,2 +1 @@ hello world -hello world again Sorry for the incomplete fix, I must have watched the wrong terminal window when coming back to check on the build progress. This is the part that now fails: {-# LANGUAGE ForeignFunctionInterface #-} main :: IO () main = putStrLn "hello world" foreign export ccall "hello" hello :: IO () hello :: IO () hello = putStrLn "hello world again" Which looks like the same problem just in a different part of the test. I'll try to fix it properly tomorrow and also notify upstream.
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