Enable dynamic loading of setxattr(2) in Darwin/Mac OS X if compiled with dl interface, TODO old dyld interface.

setter/src/unix/darwin/CMakeLists.txt

@@ -26,8 +26,15 @@ if(NOT ${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
     return()
 endif()
 
+include(CheckSymbolExists)
 find_library(CARBON_LIBRARY NAMES Carbon)
 
+CHECK_SYMBOL_EXISTS(dlsym dlfcn.h HAVE_DLSYM)
+
+if(HAVE_DLSYM)
+    add_sub_definitions(HAVE_DLSYM)
+endif()
+
 add_sources(os.c darwin.h volume.c volume.h attr.c attr.h rsrcfork.c rsrcfork.h sparse.c xattr.c xattr.h)
 
 if(CARBON_LIBRARY)

setter/src/unix/darwin/xattr.c

@@ -22,7 +22,11 @@ Aaru Data Preservation Suite
 Copyright (C) 2011-2021 Natalia Portillo
 *****************************************************************************/
 
+// TODO: old dyld interface
+#if HAVE_DLSYM
 #include <dlfcn.h>
+#endif // HAVE_DLSYM
+
 #include <errno.h>
 #include <stdio.h>
 #include <sys/stat.h>
@@ -33,13 +37,15 @@ Copyright (C) 2011-2021 Natalia Portillo
 
 void DarwinExtendedAttributes(const char* path)
 {
+// TODO: old dyld interface
+#if HAVE_DLSYM
     int              ret;
     FILE*            file;
     int              rc;
     int              cRc;
     _darwin_setxattr darwin_setxattr;
 
-  darwin_setxattr = (_darwin_setxattr)dlsym(RTLD_DEFAULT, "setxattr");
+    darwin_setxattr = (_darwin_setxattr)dlsym(RTLD_DEFAULT, "setxattr");
 
     if(!darwin_setxattr)
     {
@@ -100,4 +106,8 @@ void DarwinExtendedAttributes(const char* path)
         if(ret) cRc = errno;
     }
     log_write("\tFile with an extended attribute called \"com.ibm.os2.icon\", rc = %d, cRc = %d\n", rc, cRc);
+#else  // HAVE_DLSYM
+    printf("This version is not compiled to try extended attributes. This version MUST NOT be used in Mac OS X 10.4 "
+           "(Darwin 8.0) or higher\n");
+#endif // HAVE_DLSYM
 }