mono 6.0.0.319_0 Building Error on 10.15

[fuzunspm (Hüseyin Fahri Uzun)]

After upgrading my macOS to Catalina 10.15, mono can't be built with the error output below

Error: Failed to build mono: command execution failed
Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_mono/mono/main.log for details.

:info:build Exit code: 2
:error:build Failed to build mono: command execution failed
:debug:build Error code: CHILDSTATUS 70005 2
:debug:build Backtrace: command execution failed
:debug:build     while executing
:debug:build "system {*}$notty {*}$nice $fullcmdstring"
:debug:build     invoked from within
:debug:build "command_exec build"
:debug:build     (procedure "portbuild::build_main" line 8)
:debug:build     invoked from within
:debug:build "$procedure $targetname"
:error:build See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_mono/mono/main.log for details.

[ryandesign (Ryan Carsten Schmidt)]

Please attach the main.log file so that we can see what went wrong.

[fuzunspm (Hüseyin Fahri Uzun)]

yes i forgot that sorry

[cjones051073 (Chris Jones)]

info:build /bin/sh: line 1: 70602 Segmentation fault: 11 

means almost certainly another instance of the Xcode 11 'stack-check' issue.

[fuzunspm (Hüseyin Fahri Uzun)]

So will i fix it or i should wait for it? I'm Asking because quick internet search about the issue did not provide any useful information

[cjones051073 (Chris Jones)]

Someone (maintainer?) will need to investigate the appropriate fix for the port and to deploy it. If you are lucky, it might be enough to blacklist the Xcode 11 clang compiler (and thus fallback to MacPorts clang 9.0) but this is not always enough.

[cjones051073 (Chris Jones)]

fuzunspm - Please take a look at the fix applied to redis in

​https://github.com/macports/macports-ports/commit/e35f356df49a71148c38f8531b08b8a4abee926b#diff-c863911924e8a4d3140f5648ae95de02

patches similar to that have had to be applied to a number of ports now, to work around the issues we have with Xcode 11's clang.

If you are willing to try doing the leg work yourself, please try applying a similar fix to mono to see if it also addresses the issues here ?

[MarcusCalhoun-Lopez (Marcus Calhoun-Lopez)]

Upgrade to the latest version of mono fixed the problem for me.
However, I cannot find a reason why this is so.
If this does not work for others, please feel free to reopen the ticket.

[MarcusCalhoun-Lopez (Marcus Calhoun-Lopez)]

In 693f659888bce6d34abe2ba63fdc6416c76eee61/macports-ports (master):

mono: update version 6.0.0.319->6.4.0.198

Fixes #59427