[Nix-dev] Correct way to solve `libgcc_s.so.1` problem

[Daniel Hlynskyi]

I'm using GHCi (inside load-env-haskell). It happend that I Ctrl-C'anceled
a threaded program and GHCi was killed with "libgcc_s.so.1 must be
installed for pthread_cancel to work"

So now I have to instruct GHCi to find this library. But what is the proper
way to do so in NixOS? I've found existing solutions
([1],[2],[3],[4],[5],[6],[7],[8]) but cannot figure what to choose and
where to write those magic lines.


[1] guile:

  # Explicitly link against libgcc_s, to work around the infamous
  # "libgcc_s.so.1 must be installed for pthread_cancel to work".
  # don't have "libgcc_s.so.1" on darwin
  LDFLAGS = stdenv.lib.optionalString (!stdenv.isDarwin) "-lgcc_s";

[2] glibc

    # When building glibc from bootstrap-tools, we need libgcc_s at RPATH
for
    # any program we run, because the gcc will have been placed at a new
    # store path than that determined when built (as a source for the
    # bootstrap-tools tarball)
    # Building from a proper gcc staying in the path where it was installed,
    # libgcc_s will not be at {gcc}/lib, and gcc's libgcc will be found
without
    # any special hack.
    preInstall = ''
      if [ -f ${stdenv.gcc.gcc}/lib/libgcc_s.so.1 ]; then
          mkdir -p $out/lib
          ln -s ${stdenv.gcc.gcc}/lib/libgcc_s.so.1 $out/lib/libgcc_s.so.1
      fi
    '';

[3] guile-lib

  preCheck =
    # Make `libgcc_s.so' visible for `pthread_cancel'.
    '' export LD_LIBRARY_PATH="$(dirname $(echo
${stdenv.gcc.gcc}/lib*/libgcc_s.so)):$LD_LIBRARY_PATH"
    '';

[4] androidenv/build-tools

        # These binaries need to find libstdc++ and libgcc_s
        for i in aidl libLLVM.so
        do
            patchelf --set-rpath ${stdenv_32bit.gcc.gcc}/lib $i
        done

[5] castle-combat

  fixLoaderPath =
    let dollar = "\$"; in
    '' sed -i "$out/bin/castle-combat" \
           -e "/^exec/ iexport LD_LIBRARY_PATH=\"$(cat
${stdenv.gcc}/nix-support/orig-gcc)/lib\:"'${dollar}'"LD_LIBRARY_PATH\"\\
export LD_LIBRARY_PATH=\"$(cat
${stdenv.gcc}/nix-support/orig-gcc)/lib64\:"'${dollar}'"LD_LIBRARY_PATH\""
    '';
      # ^
      # `--- The run-time says: "libgcc_s.so.1 must be installed for
      # pthread_cancel to work", which means it needs help to find it.

[6] uqm

 /* uses pthread_cancel(), which requires libgcc_s.so.1 to be
    loadable at run-time. Adding the flag below ensures that the
    library can be found. Obviously, though, this is a hack. */
  NIX_LDFLAGS="-lgcc_s";

[7] ufoai

  NIX_CFLAGS_LINK = "-lgcc_s"; # to avoid occasional runtime error in
finding libgcc_s.so.1

[8] pjsip

  # We need the libgcc_s.so.1 loadable (for pthread_cancel to work)
  dontPatchELF = true;
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