[libstdc++.exp] Update the usage of cached result, rebuild nlocale wrapper for each variant.

diff --git a/libstdc++-v3/testsuite/lib/libstdc++.exp b/libstdc++-v3/testsuite/lib/libstdc++.exp
index 79d8e0130dcefdd8ccb67ad45f81ff12a3703600..7047b8f7b2233911445abaed54337bc46b37b7e5 100644
--- a/libstdc++-v3/testsuite/lib/libstdc++.exp
+++ b/libstdc++-v3/testsuite/lib/libstdc++.exp
@@ -688,31 +688,38 @@  proc v3-build_support { } {
     }
 }
 
-proc check_v3_target_fileio { } {
-    global et_fileio_saved
-    global et_fileio_target_name
-    global tool
-    global srcdir
+# Implement an target check for property PROP by invoking
+# the Tcl command ARGS and seeing if it returns true.
 
-    if { ![info exists et_fileio_target_name] } {
-	set et_fileio_target_name ""
-    }
+proc check_v3_target_prop_cached { prop args } {
+    global et_cache
 
-    # If the target has changed since we set the cached value, clear it.
-    set current_target [current_target_name]
-    if { $current_target != $et_fileio_target_name } {
-	verbose "check_v3_target_fileio: `$et_fileio_target_name'" 2
-	set et_fileio_target_name $current_target
-	if [info exists et_fileio_saved] {
-	    verbose "check_v3_target_fileio: removing cached result" 2
-	    unset et_fileio_saved
+    set target [current_target_name]
+    if {![info exists et_cache($prop,$target)]} {
+	verbose "check_v3_target_prop_cached $prop: checking $target" 2
+	if {[string is true -strict $args] || [string is false -strict $args]} {
+	    error {check_v3_target_prop_cached condition already evaluated; did you pass [...] instead of the expected {...}?}
+	} else {
+	    set code [catch {uplevel eval $args} result]
+	    if {$code != 0 && $code != 2} {
+		verbose "check_v3_target_prop_cached $prop: evaluation failed for $target" 2
+		return -code $code $result
+	    }
+	    set et_cache($prop,$target) $result
 	}
+    } else {
+	verbose "check_v3_target_prop_cached $prop $target: using cached result" 2
     }
 
-    if [info exists et_fileio_saved] {
-	verbose "check_v3_target_fileio: using cached result" 2
-    } else {
-	set et_fileio_saved 0
+    set value $et_cache($prop,$target)
+    verbose "check_v3_target_prop_cached $prop: returning $value for $target" 2
+    return $value
+}
+
+proc check_v3_target_fileio { } {
+    return [check_v3_target_prop_cached et_fileio {
+	global tool
+	global srcdir
 
 	# Set up, compile, and execute a C++ test program that tries to use
 	# the file functions
@@ -766,41 +773,19 @@  proc check_v3_target_fileio { } {
 	    verbose "check_v3_target_fileio: status is <$status>" 2
 
 	    if { $status == "pass" } {
-		set et_fileio_saved 1
+		return 1
 	    }
 	} else {
 	    verbose "check_v3_target_fileio: compilation failed" 2
 	}
-    }
-    return $et_fileio_saved
+	return 0
+    }]
 }
 
 # Eventually we want C90/C99 determining and switching from this.
 proc check_v3_target_c_std { } {
-    global et_c_std_saved
-    global et_c_std_target_name
-    global tool
-
-    if { ![info exists et_c_std_target_name] } {
-	set et_c_std_target_name ""
-    }
-
-    # If the target has changed since we set the cached value, clear it.
-    set current_target [current_target_name]
-    if { $current_target != $et_c_std_target_name } {
-	verbose "check_v3_target_c_std: `$et_c_std_target_name'" 2
-	set et_c_std_target_name $current_target
-	if [info exists et_c_std_saved] {
-	    verbose "check_v3_target_c_std: removing cached result" 2
-	    unset et_c_std_saved
-	}
-    }
-
-    if [info exists et_c_std_saved] {
-	verbose "check_v3_target_c_std: using cached result" 2
-    } else {
-	set et_c_std_saved 0
-
+    return [check_v3_target_prop_cached et_c_std {
+	global tool
 	# Set up, compile, and execute a C++ test program that tries to use
 	# C99 functionality.
 	# For math bits, could use check_effective_target_c99_math.
@@ -832,13 +817,13 @@  proc check_v3_target_c_std { } {
 	    verbose "check_v3_target_c_std: status is <$status>" 2
 
 	    if { $status == "pass" } {
-		set et_c_std_saved 1
+		return 1
 	    }
 	} else {
 	    verbose "check_v3_target_c_std: compilation failed" 2
 	}
-    }
-    return $et_c_std_saved
+	return 0
+    }]
 }
 
 proc check_v3_target_sharedlib { } {
@@ -847,30 +832,8 @@  proc check_v3_target_sharedlib { } {
 }
 
 proc check_v3_target_time { } {
-    global et_time_saved
-    global et_time_target_name
-    global tool
-
-    if { ![info exists et_time_target_name] } {
-	set et_time_target_name ""
-    }
-
-    # If the target has changed since we set the cached value, clear it.
-    set current_target [current_target_name]
-    if { $current_target != $et_time_target_name } {
-	verbose "check_v3_target_time: `$et_time_target_name'" 2
-	set et_time_target_name $current_target
-	if [info exists et_time_saved] {
-	    verbose "check_v3_target_time: removing cached result" 2
-	    unset et_time_saved
-	}
-    }
-
-    if [info exists et_time_saved] {
-	verbose "check_v3_target_time: using cached result" 2
-    } else {
-	set et_time_saved 0
-
+    return [check_v3_target_prop_cached et_target_time {
+	global tool
 	# Set up and compile a C++ test program that tries to use
 	# the time function
 	set src time[pid].cc
@@ -890,113 +853,87 @@  proc check_v3_target_time { } {
 	if [string match "" $lines] {
 	    # No error message, compilation succeeded.
 	    verbose "check_v3_target_time: compilation succeeded" 2
-	    set et_time_saved 1
+	    return 1
 	} else {
 	    verbose "check_v3_target_time: compilation failed" 2
+	    return 0
 	}
-    }
-    return $et_time_saved
+    }]
 }
 
 proc check_v3_target_namedlocale { args } {
-    global et_namedlocale
-    global tool
-
-    set et_namedlocale 0
-
-    # Set up, compile, and execute a C++ test program that tries to use
-    # the required named locale.
-    set exe nlocale[pid].x
-
-    if ![file exists ./$exe] {
-      set src nlocale[pid].cc
-
-      set f [open $src "w"]
-      puts $f "#include <locale>"
-      puts $f "#include <cstdio>"
-      puts $f "#include <cstring>"
-      puts $f "using namespace std;"
-      puts $f "char *transform_locale(const char *name)"
-      puts $f "{"
-      puts $f "    char *result = new char\[50\];"
-      puts $f "    strcpy(result, name);"
-      puts $f "#if defined __FreeBSD__ || defined __DragonFly__ || defined __NetBSD__"
-      puts $f "    /* fall-through */"
-      puts $f "#else"
-      puts $f "    if (strstr(result, \"ISO8859-15\")) {"
-      puts $f "        strcat(result, \"@euro\");"
-      puts $f "    }"
-      puts $f "#endif"
-      puts $f "    return result;"
-      puts $f "}"
-      puts $f "int main (int argc, char** argv)"
-      puts $f "{"
-      puts $f "  if (argc < 2)"
-      puts $f "  {"
-      puts $f "    printf(\"locale support test not supported\\n\");"
-      puts $f "    return 1;"
-      puts $f "  }"
-      puts $f "  const char *namedloc = transform_locale(*(argv + 1));"
-      puts $f "  try"
-      puts $f "  {"
-      puts $f "    locale((const char*)namedloc);"
-      puts $f "    delete\[\] namedloc;"
-      puts $f "    return 0;"
-      puts $f "  }"
-      puts $f "  catch(...)"
-      puts $f "  {"
-      puts $f "    printf(\"locale '%s' not supported\\n\", namedloc);"
-      puts $f "    delete\[\] namedloc;"
-      puts $f "    return 1;"
-      puts $f "  }"
-      puts $f "}"
-      close $f
-
-      set lines [v3_target_compile $src $exe executable ""]
-      file delete $src
-
-      if ![string match "" $lines] {
-	verbose "check_v3_target_namedlocale: compilation failed" 2
-	return $et_namedlocale
-      }
-      # else No error message, compilation succeeded.
-    }
-
-    set result [${tool}_load "./$exe" "$args" ""]
-    set status [lindex $result 0]
+    set key "et_namedlocale $args"
+    return [check_v3_target_prop_cached $key {
+	global tool
+	# Set up, compile, and execute a C++ test program that tries to use
+	# the required named locale.
+	set exe nlocale[pid].x
+	set src nlocale[pid].cc
 
-    verbose "check_v3_target_namedlocale <$args>: status is <$status>" 2
+	set f [open $src "w"]
+	puts $f "#include <locale>"
+	puts $f "#include <cstdio>"
+	puts $f "#include <cstring>"
+	puts $f "using namespace std;"
+	puts $f "char *transform_locale(const char *name)"
+	puts $f "{"
+	puts $f "    char *result = new char\[50\];"
+	puts $f "    strcpy(result, name);"
+	puts $f "#if defined __FreeBSD__ || defined __DragonFly__ || defined __NetBSD__"
+	puts $f "    /* fall-through */"
+	puts $f "#else"
+	puts $f "    if (strstr(result, \"ISO8859-15\")) {"
+	puts $f "        strcat(result, \"@euro\");"
+	puts $f "    }"
+	puts $f "#endif"
+	puts $f "    return result;"
+	puts $f "}"
+	puts $f "int main (int argc, char** argv)"
+	puts $f "{"
+	puts $f "  if (argc < 2)"
+	puts $f "  {"
+	puts $f "    printf(\"locale support test not supported\\n\");"
+	puts $f "    return 1;"
+	puts $f "  }"
+	puts $f "  const char *namedloc = transform_locale(*(argv + 1));"
+	puts $f "  try"
+	puts $f "  {"
+	puts $f "    locale((const char*)namedloc);"
+	puts $f "    delete\[\] namedloc;"
+	puts $f "    return 0;"
+	puts $f "  }"
+	puts $f "  catch(...)"
+	puts $f "  {"
+	puts $f "    printf(\"locale '%s' not supported\\n\", namedloc);"
+	puts $f "    delete\[\] namedloc;"
+	puts $f "    return 1;"
+	puts $f "  }"
+	puts $f "}"
+	close $f
 
-    if { $status == "pass" } {
-      set et_namedlocale 1
-    }
-    return $et_namedlocale
-}
+	set lines [v3_target_compile $src $exe executable ""]
+	file delete $src
 
-proc check_v3_target_debug_mode { } {
-    global et_debug_mode
-    global tool
+	if ![string match "" $lines] {
+	  verbose "check_v3_target_namedlocale: compilation failed" 2
+	  return 0
+	}
 
-    if { ![info exists et_debug_mode_target_name] } {
-	set et_debug_mode_target_name ""
-    }
+	set result [${tool}_load "./$exe" "$args" ""]
+	set status [lindex $result 0]
 
-    # If the target has changed since we set the cached value, clear it.
-    set current_target [current_target_name]
-    if { $current_target != $et_debug_mode_target_name } {
-	verbose "check_v3_target_debug_mode: `$et_debug_mode_target_name'" 2
-	set et_debug_mode_target_name $current_target
-	if [info exists et_debug_mode] {
-	    verbose "check_v3_target_debug_mode: removing cached result" 2
-	    unset et_debug_mode
-	}
-    }
+	verbose "check_v3_target_namedlocale <$args>: status is <$status>" 2
 
-    if [info exists et_debug_mode] {
-	verbose "check_v3_target_debug_mode: using cached result" 2
-    } else {
-	set et_debug_mode 0
+	if { $status == "pass" } {
+	    return 1
+	  }
+	return 0
+    }]
+}
 
+proc check_v3_target_debug_mode { } {
+    return [check_v3_target_prop_cached et_debug_mode {
+	global tool
 	# Set up and preprocess a C++ test program that depends
 	# on debug mode activated.
 	set src debug_mode[pid].cc
@@ -1012,37 +949,15 @@  proc check_v3_target_debug_mode { } {
 
 	if [string match "" $lines] {
 	    # No error message, preprocessing succeeded.
-	    set et_debug_mode 1
+	    return 1
 	}
-    }
-    verbose "check_v3_target_debug_mode: $et_debug_mode" 2
-    return $et_debug_mode
+	return 0
+    }]
 }
 
 proc check_v3_target_profile_mode { } {
-    global et_profile_mode
-    global tool	
-
-    if { ![info exists et_profile_mode_target_name] } {
-	set et_profile_mode_target_name ""
-    }
-
-    # If the target has changed since we set the cached value, clear it.
-    set current_target [current_target_name]
-    if { $current_target != $et_profile_mode_target_name } {
-	verbose "check_v3_target_profile_mode: `$et_profile_mode_target_name'" 2
-	set et_profile_mode_target_name $current_target
-	if [info exists et_profile_mode] {
-	    verbose "check_v3_target_profile_mode: removing cached result" 2
-	    unset et_profile_mode
-	}
-    }
-
-    if [info exists et_profile_mode] {
-	verbose "check_v3_target_profile_mode: using cached result" 2
-    } else {
-	set et_profile_mode 0
-
+    return [check_v3_target_prop_cached et_profile_mode {
+	global tool
 	# Set up and preprocess a C++ test program that depends
 	# on profile mode activated.
 	set src profile_mode[pid].cc
@@ -1058,37 +973,15 @@  proc check_v3_target_profile_mode { } {
 
 	if [string match "" $lines] {
 	    # No error message, preprocessing succeeded.
-	    set et_profile_mode 1
+	    return 1
 	}
-    }
-    verbose "check_v3_target_profile_mode: $et_profile_mode" 2
-    return $et_profile_mode
+	return 0
+    }]
 }
 
 proc check_v3_target_normal_mode { } {
-    global et_normal_mode
-    global tool
-
-    if { ![info exists et_normal_mode_target_name] } {
-	set et_normal_mode_target_name ""
-    }
-
-    # If the target has changed since we set the cached value, clear it.
-    set current_target [current_target_name]
-    if { $current_target != $et_normal_mode_target_name } {
-	verbose "check_v3_target_normal_mode: `$et_normal_mode_target_name'" 2
-	set et_normal_mode_target_name $current_target
-	if [info exists et_normal_mode] {
-	    verbose "check_v3_target_normal_mode: removing cached result" 2
-	    unset et_normal_mode
-	}
-    }
-
-    if [info exists et_normal_mode] {
-	verbose "check_v3_target_normal_mode: using cached result" 2
-    } else {
-	set et_normal_mode 0
-
+    return [check_v3_target_prop_cached et_normal_mode {
+	global tool
 	# Set up and compile a C++ test program that depends
 	# on normal mode activated.
 	set src normal_mode[pid].cc
@@ -1107,37 +1000,15 @@  proc check_v3_target_normal_mode { } {
 
 	if [string match "" $lines] {
 	    # No error message, compilation succeeded.
-	    set et_normal_mode 1
+	    return 1
 	}
-    }
-    verbose "check_v3_target_normal_mode: $et_normal_mode" 2
-    return $et_normal_mode
+	return 0
+    }]
 }
 
 proc check_v3_target_normal_namespace { } {
-    global et_normal_namespace
-    global tool
-
-    if { ![info exists et_normal_namespace_target_name] } {
-	set et_normal_namespace_target_name ""
-    }
-
-    # If the target has changed since we set the cached value, clear it.
-    set current_target [current_target_name]
-    if { $current_target != $et_normal_namespace_target_name } {
-	verbose "check_v3_target_normal_namespace: `$et_normal_namespace_target_name'" 2
-	set et_normal_namespace_target_name $current_target
-	if [info exists et_normal_namespace] {
-	    verbose "check_v3_target_normal_namespace: removing cached result" 2
-	    unset et_normal_namespace
-	}
-    }
-
-    if [info exists et_normal_namespace] {
-	verbose "check_v3_target_normal_namespace: using cached result" 2
-    } else {
-	set et_normal_namespace 0
-
+    return [check_v3_target_prop_cached et_normal_namespace {
+	global tool
 	# Set up and compile a C++ test program that depends
 	# on normal std namespace.
 	set src normal_namespace[pid].cc
@@ -1154,76 +1025,28 @@  proc check_v3_target_normal_namespace { } {
 
 	if [string match "" $lines] {
 	    # No error message, compilation succeeded.
-	    set et_normal_namespace 1
+	    return 1
 	}
-    }
-    verbose "check_v3_target_normal_namespace: $et_normal_namespace" 2
-    return $et_normal_namespace
+	return 0
+    }]
 }
 
 proc check_v3_target_parallel_mode { } {
-    global cxxflags
-    global v3-libgomp
-    global et_parallel_mode
-
-    global tool
-
-    if { ![info exists et_parallel_mode_target_name] } {
-	set et_parallel_mode_target_name ""
-    }
-
-    # If the target has changed since we set the cached value, clear it.
-    set current_target [current_target_name]
-    if { $current_target != $et_parallel_mode_target_name } {
-	verbose "check_v3_target_parallel_mode: `$et_parallel_mode_target_name'" 2
-	set et_parallel_mode_target_name $current_target
-	if [info exists et_parallel_mode] {
-	    verbose "check_v3_target_parallel_mode: removing cached result" 2
-	    unset et_parallel_mode
-	}
-    }
-
-    if [info exists et_parallel_mode] {
-	verbose "check_v3_target_parallel_mode: using cached result" 2
-    } else {
-	set et_parallel_mode 0
-
+    return [check_v3_target_prop_cached et_parallel_mode {
+	global cxxflags
+	global v3-libgomp
 	# If 'make check-parallel' is running the test succeeds.
 	if { ${v3-libgomp} == 1 && [regexp "libgomp" $cxxflags] } {
-	    set et_parallel_mode 1
+	    return1 1
 	}
-    }
-    verbose "check_v3_target_parallel_mode: $et_parallel_mode" 2
-    return $et_parallel_mode
+	return 0
+    }]
 }
 
 proc check_v3_target_cstdint { } {
-    global cxxflags
-    global DEFAULT_CXXFLAGS
-    global et_cstdint
-
-    global tool
-
-    if { ![info exists et_cstdint_target_name] } {
-	set et_cstdint_target_name ""
-    }
-
-    # If the target has changed since we set the cached value, clear it.
-    set current_target [current_target_name]
-    if { $current_target != $et_cstdint_target_name } {
-	verbose "check_v3_target_cstdint: `$et_cstdint_target_name'" 2
-	set et_cstdint_target_name $current_target
-	if [info exists et_cstdint] {
-	    verbose "check_v3_target_cstdint: removing cached result" 2
-	    unset et_cstdint
-	}
-    }
-
-    if [info exists et_cstdint] {
-	verbose "check_v3_target_cstdint: using cached result" 2
-    } else {
-	set et_cstdint 0
-
+    return [check_v3_target_prop_cached et_cstdint {
+	global DEFAULT_CXXFLAGS
+	global cxxflags
 	# Set up and preprocess a C++0x test program that depends
 	# on the C99 stdint facilities to be available.
 	set src cstdint[pid].cc
@@ -1244,42 +1067,18 @@  proc check_v3_target_cstdint { } {
 
 	if [string match "" $lines] {
 	    # No error message, preprocess succeeded.
-	    set et_cstdint 1
+	    return 1
 	} else {
 	    verbose "check_v3_target_cstdint: compilation failed" 2
+	    return 0
 	}
-    }
-    verbose "check_v3_target_cstdint: $et_cstdint" 2
-    return $et_cstdint
+    }]
 }
 
 proc check_v3_target_cmath { } {
-    global cxxflags
-    global DEFAULT_CXXFLAGS
-    global et_c99_math
-
-    global tool
-
-    if { ![info exists et_c99_math_target_name] } {
-	set et_c99_math_target_name ""
-    }
-
-    # If the target has changed since we set the cached value, clear it.
-    set current_target [current_target_name]
-    if { $current_target != $et_c99_math_target_name } {
-	verbose "check_v3_target_c99_math: `$et_c99_math_target_name'" 2
-	set et_c99_math_target_name $current_target
-	if [info exists et_c99_math] {
-	    verbose "check_v3_target_c99_math: removing cached result" 2
-	    unset et_c99_math
-	}
-    }
-
-    if [info exists et_c99_math] {
-	verbose "check_v3_target_c99_math: using cached result" 2
-    } else {
-	set et_c99_math 0
-
+    return [check_v3_target_prop_cached et_c99_math {
+	global cxxflags
+	global DEFAULT_CXXFLAGS
 	# Set up and preprocess a C++0x test program that depends
 	# on the C99 math facilities to be available.
 	set src c99_math[pid].cc
@@ -1300,41 +1099,18 @@  proc check_v3_target_cmath { } {
 
 	if [string match "" $lines] {
 	    # No error message, preprocess succeeded.
-	    set et_c99_math 1
+	    return 1
 	} else {
 	    verbose "check_v3_target_c99_math: compilation failed" 2
+	    return 0
 	}
-    }
-    verbose "check_v3_target_c99_math: $et_c99_math" 2
-    return $et_c99_math
+    }]
 }
 
 proc check_v3_target_thread_fence { } {
-    global cxxflags
-    global DEFAULT_CXXFLAGS
-    global et_thread_fence
-
-    global tool
-
-    if { ![info exists et_thread_fence_target_name] } {
-	set et_thread_fence_target_name ""
-    }
-
-    # If the target has changed since we set the cached value, clear it.
-    set current_target [current_target_name]
-    if { $current_target != $et_thread_fence_target_name } {
-	verbose "check_v3_target_thread_fence: `$et_thread_fence_target_name'" 2
-	set et_thread_fence_target_name $current_target
-	if [info exists et_thread_fence] {
-	    verbose "check_v3_target_thread_fence: removing cached result" 2
-	    unset et_thread_fence
-	}
-    }
-
-    if [info exists et_thread_fence] {
-	verbose "check_v3_target_thread_fence: using cached result" 2
-    } else {
-	set et_thread_fence 0
+    return [check_v3_target_prop_cached et_thread_fence {
+	global cxxflags
+	global DEFAULT_CXXFLAGS
 
 	# Set up and preprocess a C++11 test program that depends
 	# on the thread fence to be available.
@@ -1356,41 +1132,18 @@  proc check_v3_target_thread_fence { } {
 
 	if [string match "" $lines] {
 	    # No error message, linking succeeded.
-	    set et_thread_fence 1
+	    return 1
 	} else {
 	    verbose "check_v3_target_thread_fence: compilation failed" 2
+	    return 0
 	}
-    }
-    verbose "check_v3_target_thread_fence: $et_thread_fence" 2
-    return $et_thread_fence
+    }]
 }
 
 proc check_v3_target_atomic_builtins { } {
-    global cxxflags
-    global DEFAULT_CXXFLAGS
-    global et_atomic_builtins
-
-    global tool
-
-    if { ![info exists et_atomic_builtins_target_name] } {
-	set et_atomic_builtins_target_name ""
-    }
-
-    # If the target has changed since we set the cached value, clear it.
-    set current_target [current_target_name]
-    if { $current_target != $et_atomic_builtins_target_name } {
-	verbose "check_v3_target_atomic_builtins: `$et_atomic_builtins_target_name'" 2
-	set et_atomic_builtins_target_name $current_target
-	if [info exists et_atomic_builtins] {
-	    verbose "check_v3_target_atomic_builtins: removing cached result" 2
-	    unset et_atomic_builtins
-	}
-    }
-
-    if [info exists et_atomic_builtins] {
-	verbose "check_v3_target_atomic_builtins: using cached result" 2
-    } else {
-	set et_atomic_builtins 0
+    return [check_v3_target_prop_cached et_atomic_builtins {
+	global cxxflags
+	global DEFAULT_CXXFLAGS
 
 	# Set up and preprocess a C++11 test program that depends
 	# on the atomic builtin facilities to be available.
@@ -1414,41 +1167,18 @@  proc check_v3_target_atomic_builtins { } {
 
 	if [string match "" $lines] {
 	    # No error message, preprocess succeeded.
-	    set et_atomic_builtins 1
+	    return 1
 	} else {
 	    verbose "check_v3_target_atomic_builtins: compilation failed" 2
+	    return 0
 	}
-    }
-    verbose "check_v3_target_atomic_builtins: $et_atomic_builtins" 2
-    return $et_atomic_builtins
+    }]
 }
 
 proc check_v3_target_gthreads { } {
-    global cxxflags
-    global DEFAULT_CXXFLAGS
-    global et_gthreads
-
-    global tool
-
-    if { ![info exists et_gthreads_target_name] } {
-	set et_gthreads_target_name ""
-    }
-
-    # If the target has changed since we set the cached value, clear it.
-    set current_target [current_target_name]
-    if { $current_target != $et_gthreads_target_name } {
-	verbose "check_v3_target_gthreads: `$et_gthreads_target_name'" 2
-	set et_gthreads_target_name $current_target
-	if [info exists et_gthreads] {
-	    verbose "check_v3_target_gthreads: removing cached result" 2
-	    unset et_gthreads
-	}
-    }
-
-    if [info exists et_gthreads] {
-	verbose "check_v3_target_gthreads: using cached result" 2
-    } else {
-	set et_gthreads 0
+    return [check_v3_target_prop_cached et_gthreads {
+	global cxxflags
+	global DEFAULT_CXXFLAGS
 
 	# Set up and preprocess a C++0x test program that depends
 	# on the gthreads facilities to be available.
@@ -1470,42 +1200,18 @@  proc check_v3_target_gthreads { } {
 
 	if [string match "" $lines] {
 	    # No error message, preprocessing succeeded.
-	    set et_gthreads 1
+	    return 1
 	} else {
 	    verbose "check_v3_target_gthreads: compilation failed" 2
+	    return 0
 	}
-    }
-    verbose "check_v3_target_gthreads: $et_gthreads" 2
-    return $et_gthreads
+    }]
 }
 
 proc check_v3_target_gthreads_timed { } {
-    global cxxflags
-    global DEFAULT_CXXFLAGS
-    global et_gthreads_timed
-
-    global tool
-
-    if { ![info exists et_gthreads_timed_target_name] } {
-	set et_gthreads_timed_target_name ""
-    }
-
-    # If the target has changed since we set the cached value, clear it.
-    set current_target [current_target_name]
-    if { $current_target != $et_gthreads_timed_target_name } {
-	verbose "check_v3_target_gthreads_timed: `$et_gthreads_timed_target_name'" 2
-	set et_gthreads_timed_target_name $current_target
-	if [info exists et_gthreads_timed] {
-	    verbose "check_v3_target_gthreads_timed: removing cached result" 2
-	    unset et_gthreads_timed
-	}
-    }
-
-    if [info exists et_gthreads_timed] {
-	verbose "check_v3_target_gthreads_timed: using cached result" 2
-    } else {
-	set et_gthreads_timed 0
-
+    return [check_v3_target_prop_cached et_gthreads_timed {
+	global cxxflags
+	global DEFAULT_CXXFLAGS
 	# Set up and preprocess a C++0x test program that depends
 	# on the gthreads timed mutex facilities to be available.
 	set src gthreads_timed[pid].cc
@@ -1529,43 +1235,18 @@  proc check_v3_target_gthreads_timed { } {
 
 	if [string match "" $lines] {
 	    # No error message, preprocessing succeeded.
-	    set et_gthreads_timed 1
+	    return 1
 	} else {
 	    verbose "check_v3_target_gthreads_timed: compilation failed" 2
+	    return 0
 	}
-    }
-    verbose "check_v3_target_gthreads_timed: $et_gthreads_timed" 2
-    return $et_gthreads_timed
+    }]
 }
 
-
 proc check_v3_target_sleep { } {
-    global cxxflags
-    global DEFAULT_CXXFLAGS
-    global et_sleep
-
-    global tool
-
-    if { ![info exists et_sleep_target_name] } {
-	set et_sleep_target_name ""
-    }
-
-    # If the target has changed since we set the cached value, clear it.
-    set current_target [current_target_name]
-    if { $current_target != $et_sleep_target_name } {
-	verbose "check_v3_target_sleep: `$et_sleep_target_name'" 2
-	set et_sleep_target_name $current_target
-	if [info exists et_sleep] {
-	    verbose "check_v3_target_sleep: removing cached result" 2
-	    unset et_sleep
-	}
-    }
-
-    if [info exists et_sleep] {
-	verbose "check_v3_target_sleep: using cached result" 2
-    } else {
-	set et_sleep 0
-	
+    return [check_v3_target_prop_cached et_sleep {
+	global cxxflags
+	global DEFAULT_CXXFLAGS
 	# Set up and preprocess a C++11 test program that depends
 	# on the sleep facilities to be available.
 	set src sleep[pid].cc
@@ -1588,41 +1269,18 @@  proc check_v3_target_sleep { } {
 
 	if [string match "" $lines] {
 	    # No error message, preprocessing succeeded.
-	    set et_sleep 1
+	    return 1
 	} else {
 	    verbose "check_v3_target_sleep: compilation failed" 2
+	    return 0
 	}
-    }
-    verbose "check_v3_target_sleep: $et_sleep" 2
-    return $et_sleep
+    }]
 }
 
 proc check_v3_target_sched_yield { } {
-    global cxxflags
-    global DEFAULT_CXXFLAGS
-    global et_sched_yield
-
-    global tool
-
-    if { ![info exists et_sched_yield_target_name] } {
-	set et_sched_yield_target_name ""
-    }
-
-    # If the target has changed since we set the cached value, clear it.
-    set current_target [current_target_name]
-    if { $current_target != $et_sched_yield_target_name } {
-	verbose "check_v3_target_sched_yield: `$et_sched_yield_target_name'" 2
-	set et_sched_yield_target_name $current_target
-	if [info exists et_sched_yield] {
-	    verbose "check_v3_target_sched_yield: removing cached result" 2
-	    unset et_sched_yield
-	}
-    }
-
-    if [info exists et_sched_yield] {
-	verbose "check_v3_target_sched_yield: using cached result" 2
-    } else {
-	set et_sched_yield 0
+    return [check_v3_target_prop_cached et_sched_yield {
+	global cxxflags
+	global DEFAULT_CXXFLAGS
 
 	# Set up and preprocess a C++0x test program that depends
 	# on the sched_yield facility to be available.
@@ -1644,42 +1302,18 @@  proc check_v3_target_sched_yield { } {
 
 	if [string match "" $lines] {
 	    # No error message, preprocessing succeeded.
-	    set et_sched_yield 1
+	    return 1
 	} else {
 	    verbose "check_v3_target_sched_yield: compilation failed" 2
+	    return 0
 	}
-    }
-    verbose "check_v3_target_sched_yield: $et_sched_yield" 2
-    return $et_sched_yield
+    }]
 }
 
 proc check_v3_target_string_conversions { } {
-    global cxxflags
-    global DEFAULT_CXXFLAGS
-    global et_string_conversions
-
-    global tool
-
-    if { ![info exists et_string_conversions_target_name] } {
-	set et_string_conversions_target_name ""
-    }
-
-    # If the target has changed since we set the cached value, clear it.
-    set current_target [current_target_name]
-    if { $current_target != $et_string_conversions_target_name } {
-	verbose "check_v3_target_string_conversions: `$et_string_conversions_target_name'" 2
-	set et_string_conversions_target_name $current_target
-	if [info exists et_string_conversions] {
-	    verbose "check_v3_target_string_conversions: removing cached result" 2
-	    unset et_string_conversions
-	}
-    }
-
-    if [info exists et_string_conversions] {
-	verbose "check_v3_target_string_conversions: using cached result" 2
-    } else {
-	set et_string_conversions 0
-	
+    return [check_v3_target_prop_cached et_string_conversions {
+	global cxxflags
+	global DEFAULT_CXXFLAGS
 	# Set up and preprocess a C++0x test program that depends
 	# on the string_conversions facilities to be available.
 	set src string_conversions[pid].cc
@@ -1700,42 +1334,18 @@  proc check_v3_target_string_conversions { } {
 
 	if [string match "" $lines] {
 	    # No error message, preprocessing succeeded.
-	    set et_string_conversions 1
+	    return 1
 	} else {
 	    verbose "check_v3_target_string_conversions: compilation failed" 2
+	    return 0
 	}
-    }
-    verbose "check_v3_target_string_conversions: $et_string_conversions" 2
-    return $et_string_conversions
+    }]
 }
 
 proc check_v3_target_swprintf { } {
-    global cxxflags
-    global DEFAULT_CXXFLAGS
-    global et_swprintf
-
-    global tool
-
-    if { ![info exists et_swprintf_target_name] } {
-	set et_swprintf_target_name ""
-    }
-
-    # If the target has changed since we set the cached value, clear it.
-    set current_target [current_target_name]
-    if { $current_target != $et_swprintf_target_name } {
-	verbose "check_v3_target_swprintf: `$et_swprintf_target_name'" 2
-	set et_swprintf_target_name $current_target
-	if [info exists et_swprintf] {
-	    verbose "check_v3_target_swprintf: removing cached result" 2
-	    unset et_swprintf
-	}
-    }
-
-    if [info exists et_swprintf] {
-	verbose "check_v3_target_swprintf: using cached result" 2
-    } else {
-	set et_swprintf 0
-	
+    return [check_v3_target_prop_cached et_swprintf {
+	global cxxflags
+	global DEFAULT_CXXFLAGS
 	# Set up and preprocess a C++0x test program that depends
 	# on a standard swprintf function to be available.
 	set src swprintf[pid].cc
@@ -1756,42 +1366,18 @@  proc check_v3_target_swprintf { } {
 
 	if [string match "" $lines] {
 	    # No error message, preprocessing succeeded.
-	    set et_swprintf 1
+	    return 1
 	} else {
 	    verbose "check_v3_target_swprintf: compilation failed" 2
+	    return 0
 	}
-    }
-    verbose "check_v3_target_swprintf: $et_swprintf" 2
-    return $et_swprintf
+    }]
 }
 
 proc check_v3_target_binary_io { } {
-    global cxxflags
-    global DEFAULT_CXXFLAGS
-    global et_binary_io
-
-    global tool
-
-    if { ![info exists et_binary_io_target_name] } {
-	set et_binary_io_target_name ""
-    }
-
-    # If the target has changed since we set the cached value, clear it.
-    set current_target [current_target_name]
-    if { $current_target != $et_binary_io_target_name } {
-	verbose "check_v3_target_binary_io: `$et_binary_io_target_name'" 2
-	set et_binary_io_target_name $current_target
-	if [info exists et_binary_io] {
-	    verbose "check_v3_target_binary_io: removing cached result" 2
-	    unset et_binary_io
-	}
-    }
-
-    if [info exists et_binary_io] {
-	verbose "check_v3_target_binary_io: using cached result" 2
-    } else {
-	set et_binary_io 0
-	
+    return [check_v3_target_prop_cached et_binary_io {
+	global cxxflags
+	global DEFAULT_CXXFLAGS
 	# Set up and preprocess a C++0x test program that depends
 	# on text and binary I/O being the same.
 	set src binary_io[pid].cc
@@ -1812,42 +1398,18 @@  proc check_v3_target_binary_io { } {
 
 	if [string match "" $lines] {
 	    # No error message, preprocessing succeeded.
-	    set et_binary_io 1
+	    return 1
 	} else {
 	    verbose "check_v3_target_binary_io: compilation failed" 2
+	    return 0
 	}
-    }
-    verbose "check_v3_target_binary_io: $et_binary_io" 2
-    return $et_binary_io
+    }]
 }
 
 proc check_v3_target_nprocs { } {
-    global cxxflags
-    global DEFAULT_CXXFLAGS
-    global et_nprocs
-
-    global tool
-
-    if { ![info exists et_nprocs_target_name] } {
-	set et_nprocs_target_name ""
-    }
-
-    # If the target has changed since we set the cached value, clear it.
-    set current_target [current_target_name]
-    if { $current_target != $et_nprocs_target_name } {
-	verbose "check_v3_target_nprocs: `$et_nprocs_target_name'" 2
-	set et_nprocs_target_name $current_target
-	if [info exists et_nprocs] {
-	    verbose "check_v3_target_nprocs: removing cached result" 2
-	    unset et_nprocs
-	}
-    }
-
-    if [info exists et_nprocs] {
-	verbose "check_v3_target_nprocs: using cached result" 2
-    } else {
-	set et_nprocs 0
-
+    return [check_v3_target_prop_cached et_nprocs {
+	global cxxflags
+	global DEFAULT_CXXFLAGS
 	# Set up and preprocess a C++0x test program that depends
 	# on either get_nprocs or sysconf to be available.
 	set src nprocs[pid].cc
@@ -1873,27 +1435,18 @@  proc check_v3_target_nprocs { } {
 
 	if [string match "" $lines] {
 	    # No error message, preprocess succeeded.
-	    set et_nprocs 1
+	    return 1
 	} else {
 	    verbose "check_v3_target_nprocs: compilation failed" 2
+	    return 0
 	}
-    }
-    verbose "check_v3_target_nprocs: $et_nprocs" 2
-    return $et_nprocs
+    }]
 }
 
 proc check_v3_target_static_libstdcxx { } {
-    global cxxflags
-    global DEFAULT_CXXFLAGS
-    global et_static_libstdcxx
-
-    global tool
-
-    if [info exists et_static_libstdcxx] {
-	verbose "check_v3_target_static_libstdcxx: using cached result" 2
-    } else {
-	set et_static_libstdcxx 0
-
+    return [check_v3_target_prop_cached et_static_libstdcxx {
+	global cxxflags
+	global DEFAULT_CXXFLAGS
 	# Set up and link a C++0x test program that depends
 	# on static linking
 	set src static-maybe[pid].cc
@@ -1916,42 +1469,18 @@  proc check_v3_target_static_libstdcxx { } {
 
 	if [string match "" $lines] {
 	    # No error message, link succeeded.
-	    set et_static_libstdcxx 1
+	    return 1
 	} else {
 	    verbose "check_v3_target_static_libstdcxx: compilation failed" 2
+	    return 0
 	}
-    }
-    verbose "check_v3_target_static_libstdcxx: $et_static_libstdcxx" 2
-    return $et_static_libstdcxx
+    }]
 }
 
 proc check_v3_target_little_endian { } {
-    global cxxflags
-    global DEFAULT_CXXFLAGS
-    global et_little_endian
-
-    global tool
-
-    if { ![info exists et_little_endian_target_name] } {
-	set et_little_endian_target_name ""
-    }
-
-    # If the target has changed since we set the cached value, clear it.
-    set current_target [current_target_name]
-    if { $current_target != $et_little_endian_target_name } {
-	verbose "check_v3_target_little_endian: `$et_little_endian_target_name'" 2
-	set et_little_endian_target_name $current_target
-	if [info exists et_little_endian] {
-	    verbose "check_v3_target_little_endian: removing cached result" 2
-	    unset et_little_endian
-	}
-    }
-
-    if [info exists et_little_endian] {
-	verbose "check_v3_target_little_endian: using cached result" 2
-    } else {
-	set et_little_endian 0
-	
+    return [check_v3_target_prop_cached et_little_endian {
+	global cxxflags
+	global DEFAULT_CXXFLAGS
 	set src little_endian[pid].cc
 
 	set f [open $src "w"]
@@ -1969,43 +1498,20 @@  proc check_v3_target_little_endian { } {
 
 	if [string match "" $lines] {
 	    # No error message, preprocessing succeeded.
-	    set et_little_endian 1
+	    return 1
 	} else {
 	    verbose "check_v3_target_little_endian: compilation failed" 2
+	    return 0
 	}
-    }
-    verbose "check_v3_target_little_endian: $et_little_endian" 2
-    return $et_little_endian
+    }]
 }
 
 # Return 1 if the Filesystem TS is supported, 0 otherwise.
 # Cache the result.
 proc check_v3_target_filesystem_ts { } {
-    global cxxflags
-    global DEFAULT_CXXFLAGS
-    global et_filesystem_ts
-    global tool
-
-    if { ![info exists et_filesystem_ts_target_name] } {
-	set et_filesystem_ts_target_name ""
-    }
-
-    # If the target has changed since we set the cached value, clear it.
-    set current_target [current_target_name]
-    if { $current_target != $et_filesystem_ts_target_name } {
-	verbose "check_v3_target_filesystem_ts: `$et_filesystem_ts_target_name'" 2
-	set et_filesystem_ts_target_name $current_target
-	if [info exists et_filesystem_ts] {
-	    verbose "check_v3_target_filesystem_ts: removing cached result" 2
-	    unset et_filesystem_ts
-	}
-    }
-
-    if [info exists et_filesystem_ts] {
-	verbose "check_v3_target_filesystem_ts: using cached result" 2
-    } else {
-	set et_filesystem_ts 0
-
+    return [check_v3_target_prop_cached et_filesystem_ts {
+	global cxxflags
+	global DEFAULT_CXXFLAGS
 	# Set up and preprocess a C++ test program that depends
 	# on the Filesystem TS feature-test macro being defined.
 	set src filesystem_ts[pid].cc
@@ -2026,11 +1532,10 @@  proc check_v3_target_filesystem_ts { } {
 
 	if [string match "" $lines] {
 	    # No error message, preprocessing succeeded.
-	    set et_filesystem_ts 1
+	    return 1
 	}
-    }
-    verbose "check_v3_target_filesystem_ts: $et_filesystem_ts" 2
-    return $et_filesystem_ts
+	return 0
+    }]
 }
 
 # Return 1 if the "cxx11" ABI is in use using the current flags, 0 otherwise.