Fix bug 10418 - GetPrerequisites returning "not" as a dependency.

ldd can return "not found" and we need to handle it correctly.
In that case, we extract only the name of the library instead of trying for its full path.

Modules/GetPrerequisites.cmake

@@ -526,6 +526,8 @@ function(get_prerequisites target prerequisites_var exclude_system recurse exepa
   if("${gp_tool}" STREQUAL "ldd")
     set(gp_cmd_args "")
     set(gp_regex "^[\t ]*[^\t ]+ => ([^\t ]+).*${eol_char}$")
+    set(gp_regex_error "not found${eol_char}$")
+    set(gp_regex_fallback "^[\t ]*([^\t ]+) => ([^\t ]+).*${eol_char}$")
     set(gp_regex_cmp_count 1)
     set(gp_tool_known 1)
   endif("${gp_tool}" STREQUAL "ldd")
@@ -533,6 +535,8 @@ function(get_prerequisites target prerequisites_var exclude_system recurse exepa
   if("${gp_tool}" STREQUAL "otool")
     set(gp_cmd_args "-L")
     set(gp_regex "^\t([^\t]+) \\(compatibility version ([0-9]+.[0-9]+.[0-9]+), current version ([0-9]+.[0-9]+.[0-9]+)\\)${eol_char}$")
+    set(gp_regex_error "")
+    set(gp_regex_fallback "")
     set(gp_regex_cmp_count 3)
     set(gp_tool_known 1)
   endif("${gp_tool}" STREQUAL "otool")
@@ -540,6 +544,8 @@ function(get_prerequisites target prerequisites_var exclude_system recurse exepa
   if("${gp_tool}" STREQUAL "dumpbin")
     set(gp_cmd_args "/dependents")
     set(gp_regex "^    ([^ ].*[Dd][Ll][Ll])${eol_char}$")
+    set(gp_regex_error "")
+    set(gp_regex_fallback "")
     set(gp_regex_cmp_count 1)
     set(gp_tool_known 1)
     set(ENV{VS_UNICODE_OUTPUT} "") # Block extra output from inside VS IDE.
@@ -629,8 +635,13 @@ function(get_prerequisites target prerequisites_var exclude_system recurse exepa
   #
   foreach(candidate ${candidates})
   if("${candidate}" MATCHES "${gp_regex}")
+
     # Extract information from each candidate:
-    string(REGEX REPLACE "${gp_regex}" "\\1" raw_item "${candidate}")
+    if(gp_regex_error AND "${candidate}" MATCHES ${gp_regex_error})
+      string(REGEX REPLACE "${gp_regex_fallback}" "\\1" raw_item "${candidate}")
+    else(gp_regex_error AND "${candidate}" MATCHES ${gp_regex_error})
+      string(REGEX REPLACE "${gp_regex}" "\\1" raw_item "${candidate}")
+    endif(gp_regex_error AND "${candidate}" MATCHES ${gp_regex_error})
 
     if(gp_regex_cmp_count GREATER 1)
       string(REGEX REPLACE "${gp_regex}" "\\2" raw_compat_version "${candidate}")