Error building from source for Darwin (Undefined symbols)

I am trying to relocate /nix to /opt/nix on macOS Catalina.

I have looked at other options like mounting a new volume or creating a firmlink, but I have decided that moving the nix store works best for me despite losing the binary cache.

I read through 3 different things for changing the store path:

  1. The --store option which is not documented much
  2. The NIX_STORE_DIR environmental variable which again is not documented much
  3. Build Nix using -with-store-dir=/opt/nix/store

Since 3 is most documented, I went with that. I used the below commands and got the following error.

I am not sure how to proceed. Maybe if I can’t build on Darwin, can I build on Linux and target Darwin?

./configure --with-store-dir=/opt/nix/store --disable-seccomp-sandboxing --disable-gc --localstatedir=/opt/nix/var
1 warning generated.
  LD     src/libstore/libnixstore.dylib
  LD     src/libexpr/libnixexpr.dylib
  CXX    src/libmain/common-args.o
  CXX    src/libmain/shared.o
  CXX    src/libmain/stack.o
  LD     src/libmain/libnixmain.dylib
  LD     src/nix/nix
Undefined symbols for architecture x86_64:
  "_GC_free", referenced from:
      nix::CmdRepl::run(nix::ref<nix::Store>) in repl.o
  "_GC_malloc", referenced from:
      nix::CmdRepl::run(nix::ref<nix::Store>) in repl.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [src/nix/nix] Error 1

And if helpful, here is the make dry run of where I’m at:

eeee@eeee nix-2.3.75 % make -n                                                                                                           
echo "  LD    " src/nix/nix; g++ -std=c++17 -o src/nix/nix -all_load -L/usr/local/lib  src/build-remote/build-remote.o src/nix-build/nix-build.o src/nix-channel/nix-channel.o src/nix-collect-garbage/nix-collect-garbage.o src/nix-copy-closure/nix-copy-closure.o src/nix-daemon/nix-daemon.o src/nix-env/nix-env.o src/nix-env/user-env.o src/nix-instantiate/nix-instantiate.o src/nix-prefetch-url/nix-prefetch-url.o src/nix-store/dotgraph.o src/nix-store/graphml.o src/nix-store/nix-store.o src/nix/add-to-store.o src/nix/build.o src/nix/cat.o src/nix/command.o src/nix/copy.o src/nix/doctor.o src/nix/dump-path.o src/nix/edit.o src/nix/eval.o src/nix/hash.o src/nix/installables.o src/nix/legacy.o src/nix/log.o src/nix/ls.o src/nix/main.o src/nix/optimise-store.o src/nix/path-info.o src/nix/ping-store.o src/nix/progress-bar.o src/nix/repl.o src/nix/run.o src/nix/search.o src/nix/show-config.o src/nix/show-derivation.o src/nix/sigs.o src/nix/upgrade-nix.o src/nix/verify.o src/nix/why-depends.o -pthread  -L/usr/local/lib -leditline -L/usr/local/lib -lboost_context -lboost_thread -lboost_system   -Lsrc/libexpr -lnixexpr    -Lsrc/libmain -lnixmain    -Lsrc/libstore -lnixstore    -Lsrc/libutil -lnixutil 
mkdir -p "src/resolve-system-dependencies/"
echo "  CXX   " src/resolve-system-dependencies/resolve-system-dependencies.o; g++ -std=c++17 -o src/resolve-system-dependencies/resolve-system-dependencies.o -c src/resolve-system-dependencies/ -g -Wall -include config.h -fPIC -g -I . -I src -I src/libutil -I src/libstore -I src/libmain -I src/libexpr -I src/nix  -I/usr/local/Cellar/brotli/1.0.7/include -I/usr/local/include -I/usr/local/include -I/usr/local/Cellar/openssl@1.1/1.1.1g/include -I/usr/local/include -O3  -MMD -MF src/resolve-system-dependencies/.resolve-system-dependencies.o.dep -MP
echo "  LD    " src/resolve-system-dependencies/resolve-system-dependencies; g++ -std=c++17 -o src/resolve-system-dependencies/resolve-system-dependencies -all_load -L/usr/local/lib  src/resolve-system-dependencies/resolve-system-dependencies.o    -Lsrc/libstore -lnixstore    -Lsrc/libmain -lnixmain    -Lsrc/libutil -lnixutil 
echo "  GEN   " scripts/nix-http-export.cgi; rm -f scripts/nix-http-export.cgi && ./config.status --quiet --file=scripts/nix-http-export.cgi
echo "  GEN   " scripts/; rm -f scripts/ && ./config.status --quiet --file=scripts/
echo "  GEN   " scripts/nix-reduce-build; rm -f scripts/nix-reduce-build && ./config.status --quiet --file=scripts/nix-reduce-build
eeee@eeee nix-2.3.75 % 
1 Like

Solved. My Boehm garbage collector was incorrectly installed. Even though I passed in --disable-gc, that wasn’t respected and it did rely on it.