diff --git a/test/FrontendC/2002-07-14-MiscTests.c b/test/FrontendC/2002-07-14-MiscTests.c
index e78dbd72eb9..02703e26916 100644
--- a/test/FrontendC/2002-07-14-MiscTests.c
+++ b/test/FrontendC/2002-07-14-MiscTests.c
@@ -1,4 +1,4 @@
-// RUN: %llvmgcc -S %s -o - | llvm-as -f -o /dev/null
+// RUN: %llvmgcc -w -S %s -o - | llvm-as -f -o /dev/null
 
 /* These are random tests that I used when working on the GCC frontend 
    originally. */
diff --git a/test/FrontendC/2002-07-14-MiscTests3.c b/test/FrontendC/2002-07-14-MiscTests3.c
index 9a262d5fcef..773193cefd4 100644
--- a/test/FrontendC/2002-07-14-MiscTests3.c
+++ b/test/FrontendC/2002-07-14-MiscTests3.c
@@ -1,4 +1,4 @@
-// RUN: %llvmgcc -S %s -o - | llvm-as -f -o /dev/null
+// RUN: %llvmgcc -w -S %s -o - | llvm-as -f -o /dev/null
 
 
 
diff --git a/test/FrontendC/2003-09-18-BitfieldTests.c b/test/FrontendC/2003-09-18-BitfieldTests.c
index 3a7879bfb5c..900a7fdd660 100644
--- a/test/FrontendC/2003-09-18-BitfieldTests.c
+++ b/test/FrontendC/2003-09-18-BitfieldTests.c
@@ -1,4 +1,4 @@
-// RUN: %llvmgcc -S %s -o - | llvm-as -f -o /dev/null
+// RUN: %llvmgcc -w -S %s -o - | llvm-as -f -o /dev/null
 
 
 typedef struct BF {
diff --git a/test/FrontendC/2004-05-21-IncompleteEnum.c b/test/FrontendC/2004-05-21-IncompleteEnum.c
index 3636ca74293..106df5e48fc 100644
--- a/test/FrontendC/2004-05-21-IncompleteEnum.c
+++ b/test/FrontendC/2004-05-21-IncompleteEnum.c
@@ -1,4 +1,4 @@
-// RUN: %llvmgcc -S %s -o - | llvm-as -f -o /dev/null
+// RUN: %llvmgcc -w -S %s -o - | llvm-as -f -o /dev/null
 
 void test(enum foo *X) {
 }
diff --git a/test/FrontendC/2006-07-31-PR854.c b/test/FrontendC/2006-07-31-PR854.c
index 516085ae48f..3802de8fc45 100644
--- a/test/FrontendC/2006-07-31-PR854.c
+++ b/test/FrontendC/2006-07-31-PR854.c
@@ -1,4 +1,4 @@
-// RUN: %llvmgcc %s -S -o -
+// RUN: %llvmgcc -w %s -S -o -
 // PR854
   struct kernel_symbol {
     unsigned long value;
diff --git a/test/FrontendC/2007-02-16-VariableSizeStructArg.c b/test/FrontendC/2007-02-16-VariableSizeStructArg.c
index fd07cd8176f..ec6971acdb1 100644
--- a/test/FrontendC/2007-02-16-VariableSizeStructArg.c
+++ b/test/FrontendC/2007-02-16-VariableSizeStructArg.c
@@ -1,4 +1,4 @@
-// RUN: %llvmgcc -S %s -o - 
+// RUN: %llvmgcc -S -w %s -o - 
 // PR1170
 int f(int a, struct {int b[a];} c) {  return c.b[0]; }
 
diff --git a/test/FrontendC/2007-03-06-VarSizeInStruct1.c b/test/FrontendC/2007-03-06-VarSizeInStruct1.c
index 8d28a1dbd58..b4ae5654931 100644
--- a/test/FrontendC/2007-03-06-VarSizeInStruct1.c
+++ b/test/FrontendC/2007-03-06-VarSizeInStruct1.c
@@ -1,4 +1,4 @@
-// RUN: %llvmgcc %s -S -o -
+// RUN: %llvmgcc %s -w -S -o -
 void* p (int n) {
   struct f {
     char w; char x[n]; char z[];
diff --git a/test/FrontendC/2008-05-12-TempUsedBeforeDef.c b/test/FrontendC/2008-05-12-TempUsedBeforeDef.c
index 5c3bfdaf64c..21724c1c830 100644
--- a/test/FrontendC/2008-05-12-TempUsedBeforeDef.c
+++ b/test/FrontendC/2008-05-12-TempUsedBeforeDef.c
@@ -1,4 +1,4 @@
-// RUN: %llvmgcc -S -o /dev/null %s
+// RUN: %llvmgcc -w -S -o /dev/null %s
 // PR2264.
 unsigned foo = 8L;
 unsigned bar = 0L;