diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index a7d248f47502..e97ca5a0fc90 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,12 @@
+2009-11-30  Dave Korn  <dave.korn.cygwin@gmail.com>
+
+	* lib/g++.exp (g++_init): Add host-dependent settings for
+	LC_ALL and LANG.
+	* lib/gcc-dg.exp: Likewise.
+	* lib/options.exp: Likewise.
+	* lib/objc.exp (objc_init): Likewise.
+	* lib/gfortran.exp (gfortran_init): Likewise.
+
 2009-11-30  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/40371
diff --git a/gcc/testsuite/lib/g++.exp b/gcc/testsuite/lib/g++.exp
index a5f26800c1c2..df6030b568c5 100644
--- a/gcc/testsuite/lib/g++.exp
+++ b/gcc/testsuite/lib/g++.exp
@@ -193,6 +193,13 @@ proc g++_init { args } {
     setenv LC_ALL C
     setenv LANG C
 
+    # Many hosts now default to a non-ASCII C locale, however, so
+    # they can set a charset encoding here if they need.
+    if { [ishost "*-*-cygwin*"] } {
+      setenv LC_ALL C.ASCII
+      setenv LANG C.ASCII
+    }
+
     if ![info exists GXX_UNDER_TEST] then {
 	if [info exists TOOL_EXECUTABLE] {
 	    set GXX_UNDER_TEST $TOOL_EXECUTABLE
diff --git a/gcc/testsuite/lib/gcc-dg.exp b/gcc/testsuite/lib/gcc-dg.exp
index 4acfdfec8ff7..512144a6aa67 100644
--- a/gcc/testsuite/lib/gcc-dg.exp
+++ b/gcc/testsuite/lib/gcc-dg.exp
@@ -34,6 +34,13 @@ load_lib torture-options.exp
 setenv LC_ALL C
 setenv LANG C
 
+# Many hosts now default to a non-ASCII C locale, however, so
+# they can set a charset encoding here if they need.
+if { [ishost "*-*-cygwin*"] } {
+  setenv LC_ALL C.ASCII
+  setenv LANG C.ASCII
+}
+
 if [info exists TORTURE_OPTIONS] {
     set DG_TORTURE_OPTIONS $TORTURE_OPTIONS
 } else {
diff --git a/gcc/testsuite/lib/gfortran.exp b/gcc/testsuite/lib/gfortran.exp
index a4d6e2b5d38a..56aef298776d 100644
--- a/gcc/testsuite/lib/gfortran.exp
+++ b/gcc/testsuite/lib/gfortran.exp
@@ -136,6 +136,13 @@ proc gfortran_init { args } {
     setenv LC_ALL C
     setenv LANG C
 
+    # Many hosts now default to a non-ASCII C locale, however, so
+    # they can set a charset encoding here if they need.
+    if { [ishost "*-*-cygwin*"] } {
+      setenv LC_ALL C.ASCII
+      setenv LANG C.ASCII
+    }
+
     if ![info exists GFORTRAN_UNDER_TEST] then {
 	if [info exists TOOL_EXECUTABLE] {
 	    set GFORTRAN_UNDER_TEST $TOOL_EXECUTABLE
diff --git a/gcc/testsuite/lib/objc.exp b/gcc/testsuite/lib/objc.exp
index 934f31dabdcd..9d7bac0b03b3 100644
--- a/gcc/testsuite/lib/objc.exp
+++ b/gcc/testsuite/lib/objc.exp
@@ -102,6 +102,13 @@ proc objc_init { args } {
     setenv LC_ALL C
     setenv LANG C
 
+    # Many hosts now default to a non-ASCII C locale, however, so
+    # they can set a charset encoding here if they need.
+    if { [ishost "*-*-cygwin*"] } {
+      setenv LC_ALL C.ASCII
+      setenv LANG C.ASCII
+    }
+
     if { $objc_initialized == 1 } { return; }
 
     if ![info exists OBJC_UNDER_TEST] then {
diff --git a/gcc/testsuite/lib/options.exp b/gcc/testsuite/lib/options.exp
index 18359023228e..ab4819343f7c 100644
--- a/gcc/testsuite/lib/options.exp
+++ b/gcc/testsuite/lib/options.exp
@@ -18,6 +18,13 @@
 setenv LC_ALL C
 setenv LANG C
 
+# Many hosts now default to a non-ASCII C locale, however, so
+# they can set a charset encoding here if they need.
+if { [ishost "*-*-cygwin*"] } {
+  setenv LC_ALL C.ASCII
+  setenv LANG C.ASCII
+}
+
 # Run the LANGUAGE compiler with GCC_OPTIONS and inspect the compiler
 # output to make sure that they match the newline-separated patterns
 # in COMPILER_PATTERNS but not the patterns in COMPILER_NON_PATTERNS.
diff --git a/libgomp/ChangeLog b/libgomp/ChangeLog
index 070d82f2ac80..175926d3cad7 100644
--- a/libgomp/ChangeLog
+++ b/libgomp/ChangeLog
@@ -1,3 +1,8 @@
+2009-11-30  Dave Korn  <dave.korn.cygwin@gmail.com>
+
+	* testsuite/lib/libgomp.exp (libgomp_init): Add host-dependent
+	settings for LC_ALL and LANG.
+
 2009-11-25  Jakub Jelinek  <jakub@redhat.com>
 
 	PR fortran/42162
diff --git a/libgomp/testsuite/lib/libgomp.exp b/libgomp/testsuite/lib/libgomp.exp
index 972d4a1fdd3f..0c8e49f8d85c 100644
--- a/libgomp/testsuite/lib/libgomp.exp
+++ b/libgomp/testsuite/lib/libgomp.exp
@@ -66,6 +66,13 @@ proc libgomp_init { args } {
     setenv LC_ALL C
     setenv LANG C
 
+    # Many hosts now default to a non-ASCII C locale, however, so
+    # they can set a charset encoding here if they need.
+    if { [ishost "*-*-cygwin*"] } {
+      setenv LC_ALL C.ASCII
+      setenv LANG C.ASCII
+    }
+
     if ![info exists GCC_UNDER_TEST] then {
 	if [info exists TOOL_EXECUTABLE] {
 	    set GCC_UNDER_TEST $TOOL_EXECUTABLE
diff --git a/libjava/ChangeLog b/libjava/ChangeLog
index 57b5fe21f0f7..2f1f8b6a0873 100644
--- a/libjava/ChangeLog
+++ b/libjava/ChangeLog
@@ -1,3 +1,8 @@
+2009-11-30  Dave Korn  <dave.korn.cygwin@gmail.com>
+
+	* testsuite/lib/libjava.exp (libjava_init):  Add host-dependent
+	settings for LC_ALL and LANG.
+
 2009-11-30  Ben Elliston  <bje@au.ibm.com>
 
 	* jni.cc (_Jv_JNI_GetObjectRefType): Mark `object' parameter as
diff --git a/libjava/testsuite/lib/libjava.exp b/libjava/testsuite/lib/libjava.exp
index 510e4ac80d8b..b05c56843cca 100644
--- a/libjava/testsuite/lib/libjava.exp
+++ b/libjava/testsuite/lib/libjava.exp
@@ -145,6 +145,13 @@ proc libjava_init { args } {
     setenv LC_ALL C
     setenv LANG C
 
+    # Many hosts now default to a non-ASCII C locale, however, so
+    # they can set a charset encoding here if they need.
+    if { [ishost "*-*-cygwin*"] } {
+      setenv LC_ALL C.ASCII
+      setenv LANG C.ASCII
+    }
+
     if { $libjava_initialized == 1 } { return; }
 
     if ![info exists GCJ_UNDER_TEST] {