Hello,
I’m trying to install Owl on an Intel mac, but I’m getting an error when it tries to install the conf-openblas dependency:
#=== ERROR while compiling conf-openblas.0.2.2 ================================#
# context 2.3.0 | macos/x86_64 | ocaml.5.2.1 | https://opam.ocaml.org#d1985569e2c0f406d535044b53c1fde79b558617
# path ~/.opam/default/.opam-switch/build/conf-openblas.0.2.2
# command ~/.opam/opam-init/hooks/sandbox.sh build sh -exc cc $CFLAGS $(PKG_CONFIG_PATH="$(brew --prefix openblas)/lib/pk
gconfig:$PKG_CONFIG_PATH" pkg-config --cflags openblas) test.c $(PKG_CONFIG_PATH="$(brew --prefix openblas)/lib/pkgconfig:$PK
G_CONFIG_PATH" pkg-config --libs openblas)
# exit-code 1
# env-file ~/.opam/log/conf-openblas-33821-d9434e.env
# output-file ~/.opam/log/conf-openblas-33821-d9434e.out
### output ###
# +++ brew --prefix openblas
# ++ PKG_CONFIG_PATH=/usr/local/opt/openblas/lib/pkgconfig:
# ++ pkg-config --cflags openblas
# +++ brew --prefix openblas
# ++ PKG_CONFIG_PATH=/usr/local/opt/openblas/lib/pkgconfig:
# ++ pkg-config --libs openblas
# + cc -I/usr/local/Cellar/openblas/0.3.29/include -fopenmp test.c -L/usr/local/Cellar/openblas/0.3.29/lib -lopenblas
# clang: error: unsupported option '-fopenmp'
# clang: error: unsupported option '-fopenmp'
(I do have openblas and libomp installed on the system through homebrew).
The issue seems to be that it’s using the default macOS clang, which doesn’t support -fopenmp. I tried installing homebrew’s clang and the setting compiler environment variables, but the error persists, presumably because cc is invoked as sandbox.sh build sh -exc cc. I tried specifying a compiler on a new switch as well, following the instructions here, but still with no luck.
Any tips about how to get this working?