opam init doesn't initialise a switch

[InnesC-03]

When running opam init whilst following a tutorial to install OCaml, in the video it initialised a switch, however for me it just stops, and the terminal is ready for a new command.

(base) innescameron@Inness-MBP ~ % opam init

<><> Required setup - please read <><><><><><><><><><><><><><><><><><><><><>  🐫 

  In normal operation, opam only alters files within ~/.opam.

  However, to best integrate with your system, some environment variables
  should be set. If you allow it to, this initialisation step will update
  your zsh configuration by adding the following line to ~/.zshrc:

    [[ ! -r /Users/innescameron/.opam/opam-init/init.zsh ]] || source /Users/innescameron/.opam/opam-init/init.zsh  > /dev/null 2> /dev/null

  Otherwise, every time you want to access your opam installation, you will
  need to run:

    eval $(opam env)

  You can always re-run this setup with 'opam init' later.

Do you want opam to modify ~/.zshrc? [N/y/f]
(default is 'no', use 'f' to choose a different file) y
A hook can be added to opam's init scripts to ensure that the shell remains in
sync with the opam environment when they are loaded. Set that up? [y/N] y

User configuration:
  ~/.zshrc is already up-to-date.

[kit-ty-kate]

this means that you already had setup opam in the past.

Maybe we could modify the In normal operation, opam only alters files within ~/.opam. line to be more explicit about that?

EDIT: also, please use the markdown codeblock when quoting a terminal output (using ```)

[InnesC-03]

but when I try and install any platform tools I get an error:

[ERROR] No switch is currently set. Please use 'opam switch' to set or install a switch

[kit-ty-kate]

Have you tried to create a switch like the error message said? (you can open the manual for any command using opam <command> --help)

[InnesC-03]

Just tried and it failed, should I say y or n to the last bit?:

<><> Installing new switch packages <><><><><><><><><><><><><><><><><><><><>  🐫 
Switch invariant: ["ocaml" {= "5.1.1"}]
Constructing initial basis...
Number of 0-1 knapsack inequalities = 36
Constructing conflict graph...
Conflict graph has 12 + 10 = 22 vertices

<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><>  🐫 
∗ installed base-bigarray.base
∗ installed base-threads.base
∗ installed base-unix.base
∗ installed ocaml-options-vanilla.1
⬇ retrieved ocaml-base-compiler.5.1.1  (cached)
[ERROR] The compilation of ocaml-base-compiler.5.1.1 failed at "./configure --prefix=/Users/innescameron/.opam/default --docdir=/Users/innescameron/.opam/default/doc/ocaml -C CC=cc ASPP=cc -c".

#=== ERROR while compiling ocaml-base-compiler.5.1.1 ==========================#
# context     2.1.5 | macos/arm64 |  | https://opam.ocaml.org#e8c6d23b
# path        ~/.opam/default/.opam-switch/build/ocaml-base-compiler.5.1.1
# command     ~/.opam/opam-init/hooks/sandbox.sh build ./configure --prefix=/Users/innescameron/.opam/default --docdir=/Users/innescameron/.opam/default/doc/ocaml -C CC=cc ASPP=cc -c
# exit-code   77
# env-file    ~/.opam/log/ocaml-base-compiler-17200-5e86d8.env
# output-file ~/.opam/log/ocaml-base-compiler-17200-5e86d8.out
### output ###
# [...]
# configure: creating cache config.cache
# configure: Configuring OCaml version 5.1.1
# checking build system type... x86_64-apple-darwin13.4.0
# checking host system type... x86_64-apple-darwin13.4.0
# checking target system type... x86_64-apple-darwin13.4.0
# checking for x86_64-apple-darwin13.4.0-ld... x86_64-apple-darwin13.4.0-ld
# checking how to print strings... printf
# checking for x86_64-apple-darwin13.4.0-gcc... cc
# checking whether the C compiler works... no
# configure: error: in `/Users/innescameron/.opam/default/.opam-switch/build/ocaml-base-compiler.5.1.1':
# configure: error: C compiler cannot create executables
# See `config.log' for more details



<><> Error report <><><><><><><><><><><><><><><><><><><><><><><><><><><><><>  🐫 
┌─ The following actions failed
│ λ build ocaml-base-compiler 5.1.1
└─ 
┌─ The following changes have been performed (the rest was aborted)
│ ∗ install base-bigarray         base
│ ∗ install base-threads          base
│ ∗ install base-unix             base
│ ∗ install ocaml-options-vanilla 1
└─ 

<><> ocaml-base-compiler.5.1.1 troubleshooting ><><><><><><><><><><><><><><>  🐫 
=> A failure in the middle of the build may be caused by build parallelism
      (enabled by default).
      Please file a bug report at https://github.com/ocaml/opam-repository/issues
=> You can try installing again including --jobs=1
      to force a sequential build instead.
Switch initialisation failed: clean up? ('n' will leave the switch partially installed) [Y/n]

[kit-ty-kate]

# checking whether the C compiler works... no

this might mean that you did not install xcode. Could you try again after xcode-select --install ?

If the same error happens, could you list up what you installed with Homebrew using brew list -1? It might be one of the typical issue with Homebrew (for example if you have installed binutils, brew unlink binutils should fix your issue)

[InnesC-03]

I do already have Xcode installed, here's what was installed with homebrew:

(base) innescameron@Inness-MBP ~ % brew list -1
==> Formulae
gpatch

[kit-ty-kate]

mmh, interesting. I don’t think i’ve seen that issue without any homebrew involvement yet.

Does the following couple of commands work?

cd /tmp
echo 'int main() {}' > test.c
cc test.c
./a.out

[InnesC-03]

Tell me if I've done something wrong:

(base) innescameron@Inness-MBP ~ % cd /tmp
echo 'int main() {}' > test.c
cc test.c
./a.out
(base) innescameron@Inness-MBP /tmp % echo 'int main() {}' > test.c
(base) innescameron@Inness-MBP /tmp % cc test.c
(base) innescameron@Inness-MBP /tmp % ./a.out
(base) innescameron@Inness-MBP /tmp % 

[dbuenzli]

Something looks wrong here:

# context     2.1.5 | macos/arm64

[...]

# checking build system type... x86_64-apple-darwin13.4.0

[kit-ty-kate]

oh good catch! @InnesC-03 What does file "$(which opam)" give you?

[InnesC-03]

(base) innescameron@Inness-MBP /tmp % file "$(which opam)"
/usr/local/bin/opam: Mach-O 64-bit executable arm64

[kit-ty-kate]

mmh, I’m a bit lost, have you used Rosetta2 for anything in the past on this machine? Does cc --version say anything weird? What is in your PATH?

If none of these questions give us any hint to what’s going wrong, try:

opam switch create 5.1.1 # (and answer 'n' so the build directory is saved)
cd ~/.opam/5.1.1/.opam-switch/build/ocaml-base-compiler.5.1.1

and the config.log file should be verbose enough to help use find the culprit (you can attach it to a github comment after having redacted things that you don’t want to be public)

[InnesC-03]

Ehm, I might've used Rosetta2 for things in the past.

here's what cc --version says:

(base) innescameron@Inness-MBP /tmp % cc --version
Apple clang version 15.0.0 (clang-1500.1.0.2.5)
Target: arm64-apple-darwin23.3.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin

[dbuenzli]

@InnesC-03 that looks alright you'll have to provide what @kit-ty-kate suggested, the output of env (redacted to your wish) and the config.log.

[InnesC-03]

How do I find the config.log ?

[dbuenzli]

See @kit-ty-kate's message above.

[InnesC-03]

I'm really sorry but I'm having a lot of trouble finding the config.log, here's the results of env don't think anything needs redacted:

(base) innescameron@Inness-MBP ocaml-base-compiler.5.1.1 % env
__CFBundleIdentifier=com.apple.Terminal
TMPDIR=/var/folders/66/hszk1fn9625dm1rml0g_pcn40000gn/T/
XPC_FLAGS=0x0
TERM=xterm-256color
SSH_AUTH_SOCK=/private/tmp/com.apple.launchd.5QzK0TQngr/Listeners
XPC_SERVICE_NAME=0
TERM_PROGRAM=Apple_Terminal
TERM_PROGRAM_VERSION=453
TERM_SESSION_ID=2A10BC9A-CD0D-410D-BBC2-2191166997CB
SHELL=/bin/zsh
HOME=/Users/innescameron
LOGNAME=innescameron
USER=innescameron
PATH=/Users/innescameron/.opam/5.1.1/bin:/Users/innescameron/opt/anaconda3/bin:/Users/innescameron/opt/anaconda3/condabin:/opt/homebrew/bin:/opt/homebrew/sbin:/usr/local/bin:/System/Cryptexes/App/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/local/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/appleinternal/bin
SHLVL=1
PWD=/Users/innescameron/.opam/5.1.1/.opam-switch/build/ocaml-base-compiler.5.1.1
OLDPWD=/tmp
HOMEBREW_PREFIX=/opt/homebrew
HOMEBREW_CELLAR=/opt/homebrew/Cellar
HOMEBREW_REPOSITORY=/opt/homebrew
MANPATH=/opt/homebrew/share/man::
INFOPATH=/opt/homebrew/share/info:
CONDA_EXE=/Users/innescameron/opt/anaconda3/bin/conda
_CE_M=
_CE_CONDA=
CONDA_PYTHON_EXE=/Users/innescameron/opt/anaconda3/bin/python
CONDA_SHLVL=1
CONDA_PREFIX=/Users/innescameron/opt/anaconda3
CONDA_DEFAULT_ENV=base
CONDA_PROMPT_MODIFIER=(base) 
CONDA_BACKUP_HOST=Inness-MBP
HOST=x86_64-apple-darwin13.4.0
CONDA_TOOLCHAIN_HOST=x86_64-apple-darwin13.4.0
CONDA_TOOLCHAIN_BUILD=x86_64-apple-darwin13.4.0
AR=x86_64-apple-darwin13.4.0-ar
AS=x86_64-apple-darwin13.4.0-as
CHECKSYMS=x86_64-apple-darwin13.4.0-checksyms
INSTALL_NAME_TOOL=x86_64-apple-darwin13.4.0-install_name_tool
LIBTOOL=x86_64-apple-darwin13.4.0-libtool
LIPO=x86_64-apple-darwin13.4.0-lipo
NM=x86_64-apple-darwin13.4.0-nm
NMEDIT=x86_64-apple-darwin13.4.0-nmedit
OTOOL=x86_64-apple-darwin13.4.0-otool
PAGESTUFF=x86_64-apple-darwin13.4.0-pagestuff
RANLIB=x86_64-apple-darwin13.4.0-ranlib
REDO_PREBINDING=x86_64-apple-darwin13.4.0-redo_prebinding
SEG_ADDR_TABLE=x86_64-apple-darwin13.4.0-seg_addr_table
SEG_HACK=x86_64-apple-darwin13.4.0-seg_hack
SEGEDIT=x86_64-apple-darwin13.4.0-segedit
SIZE=x86_64-apple-darwin13.4.0-size
STRINGS=x86_64-apple-darwin13.4.0-strings
STRIP=x86_64-apple-darwin13.4.0-strip
CLANG=x86_64-apple-darwin13.4.0-clang
LD=x86_64-apple-darwin13.4.0-ld
CC=x86_64-apple-darwin13.4.0-clang
OBJC=x86_64-apple-darwin13.4.0-clang
CC_FOR_BUILD=/Users/innescameron/opt/anaconda3/bin/x86_64-apple-darwin13.4.0-clang
OBJC_FOR_BUILD=/Users/innescameron/opt/anaconda3/bin/x86_64-apple-darwin13.4.0-clang
CPPFLAGS=-D_FORTIFY_SOURCE=2 -isystem /Users/innescameron/opt/anaconda3/include
CFLAGS=-march=core2 -mtune=haswell -mssse3 -ftree-vectorize -fPIC -fPIE -fstack-protector-strong -O2 -pipe -isystem /Users/innescameron/opt/anaconda3/include
LDFLAGS=-Wl,-pie -Wl,-headerpad_max_install_names -Wl,-dead_strip_dylibs -Wl,-rpath,/Users/innescameron/opt/anaconda3/lib -L/Users/innescameron/opt/anaconda3/lib
LDFLAGS_LD=-pie -headerpad_max_install_names -dead_strip_dylibs -rpath /Users/innescameron/opt/anaconda3/lib -L/Users/innescameron/opt/anaconda3/lib
DEBUG_CFLAGS=-march=core2 -mtune=haswell -mssse3 -ftree-vectorize -fPIC -fPIE -fstack-protector-strong -O2 -pipe -Og -g -Wall -Wextra -isystem /Users/innescameron/opt/anaconda3/include
_CONDA_PYTHON_SYSCONFIGDATA_NAME=_sysconfigdata_x86_64_apple_darwin13_4_0
CMAKE_PREFIX_PATH=:/Users/innescameron/opt/anaconda3
SDKROOT=/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk
CMAKE_ARGS=-DCMAKE_AR=/Users/innescameron/opt/anaconda3/bin/x86_64-apple-darwin13.4.0-ar -DCMAKE_CXX_COMPILER_AR=/Users/innescameron/opt/anaconda3/bin/x86_64-apple-darwin13.4.0-ar -DCMAKE_C_COMPILER_AR=/Users/innescameron/opt/anaconda3/bin/x86_64-apple-darwin13.4.0-ar -DCMAKE_RANLIB=/Users/innescameron/opt/anaconda3/bin/x86_64-apple-darwin13.4.0-ranlib -DCMAKE_CXX_COMPILER_RANLIB=/Users/innescameron/opt/anaconda3/bin/x86_64-apple-darwin13.4.0-ranlib -DCMAKE_C_COMPILER_RANLIB=/Users/innescameron/opt/anaconda3/bin/x86_64-apple-darwin13.4.0-ranlib -DCMAKE_LINKER=/Users/innescameron/opt/anaconda3/bin/x86_64-apple-darwin13.4.0-ld -DCMAKE_STRIP=/Users/innescameron/opt/anaconda3/bin/x86_64-apple-darwin13.4.0-strip -DCMAKE_INSTALL_NAME_TOOL=/Users/innescameron/opt/anaconda3/bin/x86_64-apple-darwin13.4.0-install_name_tool -DCMAKE_LIBTOOL=/Users/innescameron/opt/anaconda3/bin/x86_64-apple-darwin13.4.0-libtool -DCMAKE_OSX_DEPLOYMENT_TARGET= -DCMAKE_BUILD_TYPE=Release -DCMAKE_OSX_SYSROOT=/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk
MESON_ARGS=--buildtype release
ac_cv_func_malloc_0_nonnull=yes
ac_cv_func_realloc_0_nonnull=yes
host_alias=x86_64-apple-darwin13.4.0
build_alias=x86_64-apple-darwin13.4.0
BUILD=x86_64-apple-darwin13.4.0
CLANGXX=x86_64-apple-darwin13.4.0-clang++
CXX=x86_64-apple-darwin13.4.0-clang++
CXX_FOR_BUILD=/Users/innescameron/opt/anaconda3/bin/x86_64-apple-darwin13.4.0-clang++
CXXFLAGS=-march=core2 -mtune=haswell -mssse3 -ftree-vectorize -fPIC -fPIE -fstack-protector-strong -O2 -pipe -stdlib=libc++ -fvisibility-inlines-hidden -fmessage-length=0 -isystem /Users/innescameron/opt/anaconda3/include
DEBUG_CXXFLAGS=-march=core2 -mtune=haswell -mssse3 -ftree-vectorize -fPIC -fPIE -fstack-protector-strong -O2 -pipe -stdlib=libc++ -fvisibility-inlines-hidden -fmessage-length=0 -Og -g -Wall -Wextra -isystem /Users/innescameron/opt/anaconda3/include
CMDSTAN_OLD=
CMDSTAN=/Users/innescameron/opt/anaconda3/bin/cmdstan
OPAMNOENVNOTICE=true
OPAM_SWITCH_PREFIX=/Users/innescameron/.opam/5.1.1
LANG=en_GB.UTF-8
_=/usr/bin/env

[dbuenzli]

No need to dig the log it's all there in the env.

Something is setting your CC, LD, OTOOL, RANLIB & co variables to x86_64-apple-darwin13.4.0-* binaries:

[...]
LD=x86_64-apple-darwin13.4.0-ld
CC=x86_64-apple-darwin13.4.0-clang
[...]

You need to get rid of all these things, ocaml's configure will pick them up.

[InnesC-03]

So what is it I need to run? sorry this is all a bit over my head

[dbuenzli]

I have no idea what setups these environment variables (though I suspect this conda thing is setting up these variables). Look at your .zshrc, .profile etc., get rid of the command(s) that setup these variables, create a new shell window and start over.

[kit-ty-kate]

I concur with @dbuenzli, looking at the following line:

CXX_FOR_BUILD=/Users/innescameron/opt/anaconda3/bin/x86_64-apple-darwin13.4.0-clang++

it looks like the anaconda3 you installed is the x86_64 version instead of the arm64 and that, during its installation it also messed with your default environment variables and changed your default C compiler to point to the one installed by anaconda.

I'm not sure why they do that but it looks pretty scary to me

[kit-ty-kate]

@InnesC-03 did it work?