Mac developer install instructions do not work

[ronquist]

I followed the Mac developer install instructions. When I try to install OpenBLAS from source, I get this error in the end, after a long installation process:

ld: -lto_library library filename must be 'libLTO.dylib'
ld: -lto_library library filename must be 'libLTO.dylib'
collect2: error: ld returned 1 exit status
collect2: error: ld returned 1 exit status
make[1]: *** [sblat1] Error 1
make[1]: *** Waiting for unfinished jobs....
make[1]: *** [dblat1] Error 1
ld: -lto_library library filename must be 'libLTO.dylib'
ld: -lto_library library filename must be 'libLTO.dylib'
collect2: error: ld returned 1 exit status
collect2: error: ld returned 1 exit status
make[1]: *** [cblat1] Error 1
make[1]: *** [zblat1] Error 1
make: *** [tests] Error 2

[ronquist]

The new install instructions fixed the issue above with OpenBLAS.

However, I can still not install owl in a later step. When executing the line
opam install -y --no-depexts dune ocamlfind linenoise owl menhir

I get the following error report:

[ERROR] The compilation of owl.1.2 failed at "dune build -p owl -j 7".

#=== ERROR while compiling owl.1.2 ============================================#
# context     2.5.0 | macos/arm64 | ocaml-base-compiler.5.3.0 | https://opam.ocaml.org#52c7bb2a85aae1e12dbd6e7569657b92997be1c3
# path        ~/.opam/treeppl-ocaml/.opam-switch/build/owl.1.2
# command     ~/.opam/opam-init/hooks/sandbox.sh build dune build -p owl -j 7
# exit-code   1
# env-file    ~/.opam/log/owl-65296-c84381.env
# output-file ~/.opam/log/owl-65296-c84381.out
### output ###
# ...TRUNCATED BY DUNE...
# [...]
#       std::__1::__throw_length_error[abi:ne200100](char const*) in libowl_stubs.a[85](owl_fftpack_float64.o)
#       std::__throw_bad_array_new_length[abi:ne200100]() in libowl_stubs.a[85](owl_fftpack_float64.o)
#       pocketfft::detail::util::sanity_check(std::__1::vector<unsigned long, std::__1::allocator<unsigned long>> const&, std::__1::vector<long, std::__1::allocator<long>> const&, std::__1::vector<long, std::__1::allocator<long>> const&, bool, std::__1::vector<unsigned long, std::__1::allocator<unsigned long>> const&) in libowl_stubs.a[85](owl_fftpack_float64.o)
#       pocketfft::detail::util::sanity_check(std::__1::vector<unsigned long, std::__1::allocator<unsigned long>> const&, std::__1::vector<long, std::__1::allocator<long>> const&, std::__1::vector<long, std::__1::allocator<long>> const&, bool) in libowl_stubs.a[85](owl_fftpack_float64.o)
#       ...
#   "___gxx_personality_v0", referenced from:
#       /Users/ronquist/.opam/treeppl-ocaml/.opam-switch/build/owl.1.2/_build/default/src/owl/libowl_stubs.a[86](owl_fftpack_float32.o)
# ld: symbol(s) not found for architecture arm64
# clang: error: linker command failed with exit code 1 (use -v to see invocation)
# File "caml_startup", line 1:
# Error: Error during linking (exit code 1)

[maribraga]

@ronquist did you do the symlink to GCC? First check what is your gcc version then do
cd $HOMEBREW_PREFIX/bin && ln -s gcc-15 cc (my version is 15).
I just noticed that in the instructions it is gcc-12 but we do say to check for the version.

[elegios]

Regardless, the symlink should almost certainly be removed before running the OCaml part of the instructions. But I suspect this is easier to debug in person.

[maribraga]

Oh yeah, sorry. That step is later. So I'd guess that @ronquist just needs to remove the "-y". And yes, the symlink needs to be removed. Both of these are in the instructions.