llvm-objcopy is not provided by Xcode Command Line Tools.

Revert "Disable YJIT if objcopy command is old"

  This reverts commit 75f8781c08.

.github/workflows/compilers.yml

@@ -93,10 +93,11 @@ jobs:
           - { name: clang-12,  env: { default_cc: clang-12 } }
           - { name: clang-11,  env: { default_cc: clang-11 } }
           - { name: clang-10,  env: { default_cc: clang-10 } }
-          - { name: clang-9,   env: { default_cc: clang-9 } }
-          - { name: clang-8,   env: { default_cc: clang-8 } }
-          - { name: clang-7,   env: { default_cc: clang-7 } }
-          - { name: clang-6.0, env: { default_cc: clang-6.0 } }
+          # llvm-objcopy<=9 doesn't have --wildcard. It compiles, but leaves Rust symbols in libyjit.o.
+          - { name: clang-9,   env: { default_cc: clang-9,   append_configure: '--disable-yjit' } }
+          - { name: clang-8,   env: { default_cc: clang-8,   append_configure: '--disable-yjit' } }
+          - { name: clang-7,   env: { default_cc: clang-7,   append_configure: '--disable-yjit' } }
+          - { name: clang-6.0, env: { default_cc: clang-6.0, append_configure: '--disable-yjit' } }
           - name: 'clang-16 LTO'
             container: clang-16
             env:

configure.ac

@@ -3790,23 +3790,13 @@ AS_IF([test "$cross_compiling" = no],
     )
 )
 
-dnl Needs newer objcopy in order to localize symbols added by rustc
-YJIT_OBJCOPY_OK=no
-AS_CASE(["$OBJCOPY"], [""|:], [], [
-    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[]])], [
-        AS_IF([$OBJCOPY --wildcard --keep-global-symbol='*main' --localize-symbol='__*' conftest.$OBJEXT 2>/dev/null], [
-            YJIT_OBJCOPY_OK=yes
-        ])
-    ])
-])
-
 dnl build YJIT in release mode if rustc >= 1.58.0 is present and we are on a supported platform
 AC_ARG_ENABLE(yjit,
     AS_HELP_STRING([--enable-yjit],
     [enable in-process JIT compiler that requires Rust build tools. enabled by default on supported platforms if rustc 1.58.0+ is available]),
     [YJIT_SUPPORT=$enableval],
-    [AS_CASE(["$YJIT_TARGET_OK:$YJIT_RUSTC_OK:$YJIT_OBJCOPY_OK"],
-        [yes:yes:yes], [
+    [AS_CASE(["$YJIT_TARGET_OK:$YJIT_RUSTC_OK"],
+        [yes:yes], [
             YJIT_SUPPORT=yes
         ],
         [YJIT_SUPPORT=no]
@@ -3821,9 +3811,6 @@ AS_CASE(["${YJIT_SUPPORT}"],
     AS_IF([test x"$RUSTC" = "xno"],
         AC_MSG_ERROR([rustc is required. Installation instructions available at https://www.rust-lang.org/tools/install])
     )
-    AS_IF([test x"$YJIT_OBJCOPY_OK" = yno],
-        AC_MSG_ERROR([$OBJCOPY does not recognize --wildcard option or something])
-    )
 
     AS_CASE(["${YJIT_SUPPORT}"],
     [yes], [