[GHC] #11147: GHC 7.10.3 does not compile on NixOS

[GHC]

#11147: GHC 7.10.3 does not compile on NixOS
----------------------------------------+----------------------------------
        Reporter:  waern                |                Owner:
            Type:  bug                  |               Status:  infoneeded
        Priority:  normal               |            Milestone:  8.0.1
       Component:  Build System         |              Version:  7.10.3
      Resolution:                       |             Keywords:
Operating System:  Linux                |         Architecture:  x86
 Type of failure:  Building GHC failed  |            Test Case:
      Blocked By:                       |             Blocking:
 Related Tickets:                       |  Differential Rev(s):
       Wiki Page:                       |
----------------------------------------+----------------------------------

Comment (by rwbarton):

 It's not librt that isn't being linked, it's libpthread. The eventual
 issue is here:
 {{{
 "inplace/bin/ghc-stage1" -o utils/hsc2hs/dist-install/build/tmp/hsc2hs
 -hisuf dyn_hi -osuf  dyn_o -hcsuf dyn_hc -fPIC -dynamic  -H32m -O
 -hide-all-packages -i -iutils/hsc2hs/. -iutils/hsc2hs/dist-install/build
 -iutils/hsc2hs/dist-install/build/autogen -Iutils/hsc2hs/dist-
 install/build -Iutils/hsc2hs/dist-install/build/autogen     -optP-include
 -optPutils/hsc2hs/dist-install/build/autogen/cabal_macros.h -package-key
 base_HQfYBxpPvuw8OunzQu6JGM -package-key conta_2C3ZI8RgPO2LBMidXKTvIU
 -package-key direc_0hFG6ZxK1nk4zsyOqbNHfm -package-key
 filep_Ey7a1in9roBAE8bUFJ5R9m -package-key proce_52AgREEfSrnJLlkGV9YZZJ
 -XHaskell2010  -no-user-package-db -rtsopts      -odir utils/hsc2hs/dist-
 install/build -hidir utils/hsc2hs/dist-install/build -stubdir utils/hsc2hs
 /dist-install/build   -optl-L'/tmp/nix-build-
 ghc-7.10.3.drv-0/ghc-7.10.3/libraries/process/dist-install/build'
 -optl-L'/tmp/nix-build-ghc-7.10.3.drv-0/ghc-7.10.3/libraries/directory
 /dist-install/build' -optl-L'/tmp/nix-build-
 ghc-7.10.3.drv-0/ghc-7.10.3/libraries/unix/dist-install/build'
 -optl-L'/tmp/nix-build-ghc-7.10.3.drv-0/ghc-7.10.3/libraries/time/dist-
 install/build' -optl-L'/tmp/nix-build-
 ghc-7.10.3.drv-0/ghc-7.10.3/libraries/filepath/dist-install/build'
 -optl-L'/tmp/nix-build-ghc-7.10.3.drv-0/ghc-7.10.3/libraries/containers
 /dist-install/build' -optl-L'/tmp/nix-build-
 ghc-7.10.3.drv-0/ghc-7.10.3/libraries/bytestring/dist-install/build'
 -optl-L'/tmp/nix-build-ghc-7.10.3.drv-0/ghc-7.10.3/libraries/deepseq/dist-
 install/build' -optl-L'/tmp/nix-build-
 ghc-7.10.3.drv-0/ghc-7.10.3/libraries/array/dist-install/build'
 -optl-L'/tmp/nix-build-ghc-7.10.3.drv-0/ghc-7.10.3/libraries/base/dist-
 install/build' -optl-L'/tmp/nix-build-
 ghc-7.10.3.drv-0/ghc-7.10.3/libraries/integer-gmp2/dist-install/build'
 -optl-L'/nix/store/blp0hymd8i8m1v4cjcrkacbh6cw6ia8d-gmp-5.1.3/lib'
 -optl-L'/tmp/nix-build-ghc-7.10.3.drv-0/ghc-7.10.3/libraries/ghc-prim
 /dist-install/build' -optl-L'/tmp/nix-build-
 ghc-7.10.3.drv-0/ghc-7.10.3/rts/dist/build' -optl-lrt -optl-lutil -optl-
 ldl -optl-lgmp -optl-lm -optl-lrt -optl-ldl -fPIC -dynamic  -H32m -O
 -hide-all-packages -i -iutils/hsc2hs/. -iutils/hsc2hs/dist-install/build
 -iutils/hsc2hs/dist-install/build/autogen -Iutils/hsc2hs/dist-
 install/build -Iutils/hsc2hs/dist-install/build/autogen     -optP-include
 -optPutils/hsc2hs/dist-install/build/autogen/cabal_macros.h -package-key
 base_HQfYBxpPvuw8OunzQu6JGM -package-key conta_2C3ZI8RgPO2LBMidXKTvIU
 -package-key direc_0hFG6ZxK1nk4zsyOqbNHfm -package-key
 filep_Ey7a1in9roBAE8bUFJ5R9m -package-key proce_52AgREEfSrnJLlkGV9YZZJ
 -XHaskell2010  -no-user-package-db -rtsopts      -fno-use-rpaths -optl-
 Wl,-rpath -optl-Wl,'$ORIGIN/../proce_52AgREEfSrnJLlkGV9YZZJ' -optl-
 Wl,-rpath -optl-Wl,'$ORIGIN/../direc_0hFG6ZxK1nk4zsyOqbNHfm' -optl-
 Wl,-rpath -optl-Wl,'$ORIGIN/../unix_KZL8h98IqDM57kQSPo1mKx' -optl-
 Wl,-rpath -optl-Wl,'$ORIGIN/../time_FTheb6LSxyX1UABIbBXRfn' -optl-
 Wl,-rpath -optl-Wl,'$ORIGIN/../filep_Ey7a1in9roBAE8bUFJ5R9m' -optl-
 Wl,-rpath -optl-Wl,'$ORIGIN/../conta_2C3ZI8RgPO2LBMidXKTvIU' -optl-
 Wl,-rpath -optl-Wl,'$ORIGIN/../bytes_6VWy06pWzJq9evDvK2d4w6' -optl-
 Wl,-rpath -optl-Wl,'$ORIGIN/../deeps_6vMKxt5sPFR0XsbRWvvq59' -optl-
 Wl,-rpath -optl-Wl,'$ORIGIN/../array_67iodizgJQIIxYVTp4emlA' -optl-
 Wl,-rpath -optl-Wl,'$ORIGIN/../base_HQfYBxpPvuw8OunzQu6JGM' -optl-
 Wl,-rpath -optl-Wl,'$ORIGIN/../integ_2aU3IZNMF9a7mQ0OzsZ0dS' -optl-
 Wl,-rpath -optl-Wl,'$ORIGIN/../ghcpr_8TmvWUcS1U1IKHT0levwg3' -optl-
 Wl,-rpath -optl-Wl,'$ORIGIN/../rts' -optl-Wl,-zorigin utils/hsc2hs/dist-
 install/build/Main.dyn_o utils/hsc2hs/dist-install/build/C.dyn_o
 utils/hsc2hs/dist-install/build/Common.dyn_o utils/hsc2hs/dist-
 install/build/CrossCodegen.dyn_o utils/hsc2hs/dist-
 install/build/DirectCodegen.dyn_o utils/hsc2hs/dist-
 install/build/Flags.dyn_o utils/hsc2hs/dist-install/build/HSCParser.dyn_o
 utils/hsc2hs/dist-install/build/UtilsCodegen.dyn_o utils/hsc2hs/dist-
 install/build/Paths_hsc2hs.dyn_o
 /nix/store/5kdjp8200hazaydx0dmwn5qghqkyi3py-binutils-2.23.1/bin/ld:
 warning: libpthread.so.0, needed by /nix/store
 /483br9kb3f5igsgmb6aqsjhl2ipj2bxr-glibc-2.21/lib/librt.so, not found (try
 using -rpath or -rpath-link)
 }}}

 On my working system, `utils/hsc2hs/dist-install/build/tmp/hsc2hs` is
 built with the option `-optl-lpthread` also, which is missing from the
 above command line.

 This flag comes from the `extra-libraries` field of the `unix` package,
 which is populated from the configure variable `EXTRA_LIBS` via
 `libraries/unix/unix.buildinfo.in`. On my system `pthread` is added to
 that variable by this from `configure.ac`:
 {{{
 AC_SEARCH_LIBS(sem_close, pthread,
     [EXTRA_LIBS="$EXTRA_LIBS $ac_lib"],
     [AC_MSG_NOTICE([Not found])])
 }}}
 but in your `libraries/unix` configure output I see
 {{{
 checking for library containing sem_close... none required
 }}}
 so that explains why later `-optl-pthread` is not provided when building
 `utils/hsc2hs/dist-install/build/tmp/hsc2hs`.

 I don't understand why on your Nix system configure apparently detected
 that `-lpthread` is not needed for the symbol `sem_close`. Apparently it
 was wrong about that. I also have no idea what this has to do with the
 commit that apparently broke things for you. (I am building the tip of the
 ghc-7.10 branch, so I also have that commit.)

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11147#comment:7>
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