Bug 1841902 - Patch ld64 to avoid dead-stripping rust compiler_builti…

…ns atoms. r=firefox-build-system-reviewers,ahochheiden

Sent upstream at tpoechtrager/cctools-port#135.

Differential Revision: https://phabricator.services.mozilla.com/D182833

UltraBlame original commit: 03b2eccaf86fbc9cb989ec3d9dfce6e12e827a7e

taskcluster/scripts/misc/build-cctools-port.sh

@@ -546,6 +546,21 @@ crosstools
 port
 cd
 CROSSTOOLS_CCTOOLS_DIR
+patch
+-
+p2
+<
+GECKO_PATH
+/
+taskcluster
+/
+scripts
+/
+misc
+/
+cctools
+.
+patch
 #
 Force
 re

taskcluster/scripts/misc/cctools.patch

@@ -0,0 +1,315 @@
+diff
+-
+-
+git
+a
+/
+cctools
+/
+ld64
+/
+src
+/
+ld
+/
+Resolver
+.
+cpp
+b
+/
+cctools
+/
+ld64
+/
+src
+/
+ld
+/
+Resolver
+.
+cpp
+index
+bfb67a3
+.
+.
+d5b1c67
+100644
+-
+-
+-
+a
+/
+cctools
+/
+ld64
+/
+src
+/
+ld
+/
+Resolver
+.
+cpp
++
++
++
+b
+/
+cctools
+/
+ld64
+/
+src
+/
+ld
+/
+Resolver
+.
+cpp
+-
+1178
+9
++
+1178
+10
+void
+Resolver
+:
+:
+deadStripOptimize
+(
+bool
+force
+)
+/
+/
+unset
+liveness
+so
+markLive
+(
+)
+will
+recurse
+(
+const_cast
+<
+ld
+:
+:
+Atom
+*
+>
+(
+atom
+)
+)
+-
+>
+setLive
+(
+0
+)
+;
+}
+-
+/
+/
+<
+rdar
+:
+/
+/
+problem
+/
+49468634
+>
+if
+doing
+LTO
+mark
+all
+libclang_rt
+*
+mach
+-
+o
+atoms
+as
+live
+since
+the
+backend
+may
+suddenly
+codegen
+uses
+of
+them
++
+/
+/
+<
+rdar
+:
+/
+/
+problem
+/
+49468634
+>
+if
+doing
+LTO
+mark
+all
+libclang_rt
+*
+mach
+-
+o
+atoms
+as
+live
+since
+the
+backend
+may
+suddenly
+codegen
+uses
+of
+them
+.
++
+/
+/
+Likewise
+with
+rust
+compiler_builtins
+atoms
+.
+They
+may
+come
+from
+a
+libcompiler_builtins
+-
+<
+hash
+>
+.
+a
+lib
+or
+from
+a
+compiler_builtins
+-
+.
+.
+.
+member
+of
+a
+rust
+static
+library
+.
+else
+if
+(
+_haveLLVMObjs
+&
+&
+!
+force
+&
+&
+(
+atom
+-
+>
+contentType
+(
+)
+!
+=
+ld
+:
+:
+Atom
+:
+:
+typeLTOtemporary
+)
+)
+{
+-
+if
+(
+strstr
+(
+atom
+-
+>
+safeFilePath
+(
+)
+"
+libclang_rt
+"
+)
+!
+=
+nullptr
+)
+{
++
+if
+(
+strstr
+(
+atom
+-
+>
+safeFilePath
+(
+)
+"
+libclang_rt
+"
+)
+!
+=
+nullptr
+|
+|
+strstr
+(
+atom
+-
+>
+safeFilePath
+(
+)
+"
+compiler_builtins
+"
+)
+!
+=
+nullptr
+)
+{
+_deadStripRoots
+.
+insert
+(
+atom
+)
+;
+}
+}