mono will not install on macOS 12 on M1 hardware

[gctwnl]

I'm working on a brand new Mac that has macOS 12.0.1 installed. I installed a fresh MacPorts package for Monterey, then proceeded to upgrade the ports that had apparently been moved over to my new machine by Migration Assistant.

mono fails to compile.

[gctwnl]

main.log from MacPorts containing the error.

[NitigyaS (Nitigya)]

I am facing the same error for

:debug:clean Starting logging for mono @6.12.0.122_0
:debug:sysinfo macOS 12.0.1 (darwin/21.1.0) arch arm
:debug:sysinfo MacPorts 2.7.1
:debug:sysinfo Xcode 13.2
:debug:sysinfo SDK 12
:debug:sysinfo MACOSX_DEPLOYMENT_TARGET: 12.0
...skipping...
:info:build                                         ^~~~
:info:build mono-context.c:450:11: error: no member named '__r' in 'struct __darwin_arm_thread_state64'
:info:build         memcpy (&UCONTEXT_REG_R0 (my_uc), &mctx->regs, sizeof (host_mgreg_t) * 12);
:info:build         ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
:info:build ./mono-sigcontext.h:384:72: note: expanded from macro 'UCONTEXT_REG_R0'
:info:build         #define UCONTEXT_REG_R0(ctx) (((ucontext_t*)(ctx))->uc_mcontext->__ss.__r[0])
:info:build                                                                               ^
:info:build /Library/Developer/CommandLineTools/SDKs/MacOSX12.sdk/usr/include/secure/_string.h:63:62: note: expanded from macro 'memcpy'
:info:build                 __builtin___memcpy_chk (dest, __VA_ARGS__, __darwin_obsz0 (dest))
:info:build                                                            ~~~~~~~~~~~~~~~~^~~~~
:info:build /Library/Developer/CommandLineTools/SDKs/MacOSX12.sdk/usr/include/secure/_common.h:38:55: note: expanded from macro '__darwin_obsz0'
:info:build #define __darwin_obsz0(object) __builtin_object_size (object, 0)
:info:build                                                       ^~~~~~
:info:build mono-context.c:452:10: error: no member named '__fs' in 'struct __darwin_mcontext64'
:info:build         memcpy (UCONTEXT_REG_VFPREGS (my_uc), &mctx->fregs, sizeof (double) * 16);
:info:build         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
:info:build ./mono-sigcontext.h:398:81: note: expanded from macro 'UCONTEXT_REG_VFPREGS'
:info:build         #define UCONTEXT_REG_VFPREGS(ctx) (double*)(((ucontext_t*)(ctx))->uc_mcontext->__fs.__r)
:info:build                                                                                        ^
:info:build /Library/Developer/CommandLineTools/SDKs/MacOSX12.sdk/usr/include/secure/_string.h:63:27: note: expanded from macro 'memcpy'
:info:build                 __builtin___memcpy_chk (dest, __VA_ARGS__, __darwin_obsz0 (dest))
:info:build                                         ^~~~
:info:build mono-context.c:452:10: error: no member named '__fs' in 'struct __darwin_mcontext64'
:info:build         memcpy (UCONTEXT_REG_VFPREGS (my_uc), &mctx->fregs, sizeof (double) * 16);
:info:build         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
:info:build ./mono-sigcontext.h:398:81: note: expanded from macro 'UCONTEXT_REG_VFPREGS'
:info:build         #define UCONTEXT_REG_VFPREGS(ctx) (double*)(((ucontext_t*)(ctx))->uc_mcontext->__fs.__r)
:info:build                                                                                        ^
:info:build /Library/Developer/CommandLineTools/SDKs/MacOSX12.sdk/usr/include/secure/_string.h:63:62: note: expanded from macro 'memcpy'
:info:build                 __builtin___memcpy_chk (dest, __VA_ARGS__, __darwin_obsz0 (dest))
:info:build                                                            ~~~~~~~~~~~~~~~~^~~~~
:info:build /Library/Developer/CommandLineTools/SDKs/MacOSX12.sdk/usr/include/secure/_common.h:38:55: note: expanded from macro '__darwin_obsz0'
:info:build #define __darwin_obsz0(object) __builtin_object_size (object, 0)
:info:build                                                       ^~~~~~
:info:build 6 errors generated.
:info:build make[5]: *** [libmonoutils_la-mono-context.lo] Error 1
:info:build make[5]: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_mono/mono/work/mono-6.12.0.122/mono/utils'
:info:build make[4]: *** [all-recursive] Error 1
:info:build make[4]: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_mono/mono/work/mono-6.12.0.122/mono/utils'
:info:build make[3]: *** [all] Error 2
:info:build make[3]: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_mono/mono/work/mono-6.12.0.122/mono/utils'
:info:build make[2]: *** [all-recursive] Error 1
:info:build make[2]: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_mono/mono/work/mono-6.12.0.122/mono'
:info:build make[1]: *** [all-recursive] Error 1
:info:build make[1]: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_mono/mono/work/mono-6.12.0.122'
:info:build make: *** [all] Error 2
:info:build make: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_mono/mono/work/mono-6.12.0.122'
:info:build Command failed:  cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_mono/mono/work/mono-6.12.0.122" && /usr/bin/make -j8 -w all
:info:build Exit code: 2
:error:build Failed to build mono: command execution failed
:debug:build Error code: CHILDSTATUS 2063 2
:debug:build Backtrace: command execution failed
:debug:build     while executing
:debug:build "system {*}$notty {*}$callback {*}$nice $fullcmdstring"
:debug:build     invoked from within
:debug:build "command_exec -callback portprogress::target_progress_callback build"
:debug:build     (procedure "portbuild::build_main" line 8)
:debug:build     invoked from within
:debug:build "$procedure $targetname"

[davidben (David Benjamin)]

I ran into this as well, and can reproduce this building from the tarball directly. It looks like UCONTEXT_REG_R0 is getting expanded from here:

​https://github.com/mono/mono/blob/mono-6.12.0.122/mono/utils/mono-sigcontext.h#L384

Yet presumably this is the right expansion for aarch64:

​https://github.com/mono/mono/blob/mono-6.12.0.122/mono/utils/mono-sigcontext.h#L466

Looks like the immediate problem is the config.sub, or some other part of autotools, shipped in the Mono tarball is too old and is guessing a target triple of arm-apple-darwin21.2.0 instead of aarch64-apple-darwin21.2.0. If I autoreconf -fvi, I get a little further along in the build, though it seems to break later on for some bootstrapping reason. ./configure --build=aarch64-apple-darwin21.2.0 similarly avoids the outdated config.sub but runs into the bootstrapping problem.

Given the latest release doesn't yet include ​https://github.com/mono/mono/pull/20166, this is perhaps not expected to work yet. ​https://github.com/mono/mono/pull/20166#discussion_r745633487 may also become an issue.

[mojca (Mojca Miklavec)]

It looks as if HomeBrew managed to patch it to a sufficient extent?

​https://github.com/Homebrew/homebrew-core/commit/38464dff41172272d0e6651ba2277cc11332bf0c

[mojca (Mojca Miklavec)]

I desperately needed a functional binary, so I tried to create a -devel subport which successfully built for me on M1 without any patches: ​https://github.com/macports/macports-ports/pull/14952

It's not in ideal shape yet, but maybe some brainstorming together will eventually help us come up with a better solution.

[mojca (Mojca Miklavec)]

The problem quoted above can apparently be solved with

use_autoconf        yes
autoconf.cmd        autoreconf -ivf

I reported this upstream and they'll try to check whether they could update their tools.

Now, building version 6.12.0.122 with autoreconf doesn't really help: there's a segmentation fault somewhere in the build process. But note that the official page now lists 6.12.0.179 as the latest version, and a binary download of the stable version will give you that one.

The sources for that version on the other hand only fly to preview/ (upstream isn't sure why, they'll investigate).

I was checking what HB does and it doesn't seem like they would be using any heavy duty patches, so I thought that maybe 6.12 might work as well.

From what I understood, the only reason why mono isn't releasing a newer official stable version is because tons of other dependencies need to be updated as well, and with Microsoft migrating to dotnet 6 as a replacement for Mono, there's no longer so much demand and no longer any such strong checks as there used to be.

[mojca (Mojca Miklavec)]

Building a newer version from the "preview" branch requires patching our patches, so I couldn't do a quick test yet to check whether it's passing.

[Mojca Miklavec <mojca@…>]

In 6fced074e119fc475168e2d7a0f78b1fca1d3f5c/macports-ports (master):

mono-devel: preliminary subport that builds on M1

See: #64059

[mojca (Mojca Miklavec)]

I made a mistake of forgetting to squash/finalize the commits and properly referencing this ticket after a long wait for feedback. But the problem should be fixed now.