Merge 8bfe503ec6 into merged_master (Bitcoin PR bitcoin/bitcoin#27628)

configure.ac

@@ -70,11 +70,12 @@ else
 fi
 AC_PROG_CXX
 
-dnl By default, libtool for mingw refuses to link static libs into a dll for
-dnl fear of mixing pic/non-pic objects, and import/export complications. Since
-dnl we have those under control, re-enable that functionality.
+dnl libtool overrides
 case $host in
   *mingw*)
+     dnl By default, libtool for mingw refuses to link static libs into a dll for
+     dnl fear of mixing pic/non-pic objects, and import/export complications. Since
+     dnl we have those under control, re-enable that functionality.
      lt_cv_deplibs_check_method="pass_all"
 
      dnl Remove unwanted -DDLL_EXPORT from these variables.
@@ -83,6 +84,16 @@ case $host in
      lt_cv_prog_compiler_pic="-DPIC"
      lt_cv_prog_compiler_pic_CXX="-DPIC"
   ;;
+  *darwin*)
+     dnl Because it prints a verbose warning, lld fails the following check
+     dnl for "-Wl,-single_module" from libtool.m4:
+     dnl   # If there is a non-empty error log, and "single_module"
+     dnl   # appears in it, assume the flag caused a linker warning
+     dnl "-single_module" works fine on ld64 and lld, so just bypass the test.
+     dnl Failure to set this to "yes" causes libtool to use a very broken
+     dnl link-line for shared libs.
+     lt_cv_apple_cc_single_mod="yes"
+  ;;
 esac
 
 AC_ARG_WITH([seccomp],