commit 0666d08da704bd782a5347e03db90aa4d981c5c8
Author: Dave Cottlehuber <dch@FreeBSD.org>
Date:   Thu Jan 27 08:40:09 2022 +0000

    lang/mono: fix build on aarch64

diff --git lang/mono/Makefile lang/mono/Makefile
index 7003f645a52a..7c8fe62872de 100644
--- lang/mono/Makefile
+++ lang/mono/Makefile
@@ -66,6 +66,7 @@ OPTIONS_SLAVE=	MONOLITE
 .include <bsd.port.options.mk>
 
 .if ${ARCH} == aarch64
+EXTRA_PATCHES= ${FILESDIR}/extra-patch-aarch64-race-workaround
 PLIST=	${.CURDIR}/pkg-plist.aarch64
 .endif
 
diff --git lang/mono/files/extra-patch-aarch64-race-workaround lang/mono/files/extra-patch-aarch64-race-workaround
new file mode 100644
index 000000000000..d7dd165bd609
--- /dev/null
+++ lang/mono/files/extra-patch-aarch64-race-workaround
@@ -0,0 +1,26 @@
+https://bugs.freebsd.org/bugzilla/attachment.cgi?id=195063&action=diff#i/lang/mono/files/extra-patch-aarch64-race-workaround_sec1
+
+Workaround for Roslyn crash: https://github.com/mono/mono/issues/7017
+
+--- mcs/build/profiles/basic.make.orig	2021-11-08 19:42:34.845483000 +0100
++++ mcs/build/profiles/basic.make	2021-11-08 19:43:00.996003000 +0100
+@@ -47,7 +47,7 @@ LIBRARY_COMPILE = $(BOOT_COMPILE)
+ #
+ # Copy from rules.make because I don't know how to unset MCS_FLAGS
+ #
+-USE_MCS_FLAGS = /codepage:$(CODEPAGE) /nologo /noconfig /deterministic $(LOCAL_MCS_FLAGS) $(PLATFORM_MCS_FLAGS) $(PROFILE_MCS_FLAGS) $(MCS_FLAGS)
++USE_MCS_FLAGS = /codepage:$(CODEPAGE) /parallel- /nologo /noconfig /deterministic $(LOCAL_MCS_FLAGS) $(PLATFORM_MCS_FLAGS) $(PROFILE_MCS_FLAGS) $(MCS_FLAGS)
+ 
+ .PHONY: profile-check do-profile-check
+ profile-check:
+--- mcs/build/rules.make.orig	2021-11-08 19:43:05.777570000 +0100
++++ mcs/build/rules.make	2021-11-08 19:43:20.886314000 +0100
+@@ -34,7 +34,7 @@ BUILD_TOOLS_PROFILE = build
+ endif
+ endif
+ 
+-USE_MCS_FLAGS = /codepage:$(CODEPAGE) /nologo /noconfig /deterministic $(LOCAL_MCS_FLAGS) $(PLATFORM_MCS_FLAGS) $(PROFILE_MCS_FLAGS) $(MCS_FLAGS)
++USE_MCS_FLAGS = /codepage:$(CODEPAGE) /parallel- /nologo /noconfig /deterministic $(LOCAL_MCS_FLAGS) $(PLATFORM_MCS_FLAGS) $(PROFILE_MCS_FLAGS) $(MCS_FLAGS)
+ USE_MBAS_FLAGS = /codepage:$(CODEPAGE) $(LOCAL_MBAS_FLAGS) $(PLATFORM_MBAS_FLAGS) $(PROFILE_MBAS_FLAGS) $(MBAS_FLAGS)
+ USE_CFLAGS = $(LOCAL_CFLAGS) $(CFLAGS) $(CPPFLAGS)
+ CSCOMPILE = $(Q_MCS) $(MCS) $(USE_MCS_FLAGS)