diff --git a/llvm/test/tools/llvm-link/archive.ll b/llvm/test/tools/llvm-link/archive.ll
--- a/llvm/test/tools/llvm-link/archive.ll
+++ b/llvm/test/tools/llvm-link/archive.ll
@@ -1,9 +1,7 @@
-# XFAIL: system-aix
-
 # RUN: llvm-as %S/Inputs/f.ll -o %t.f.bc
 # RUN: llvm-as %S/Inputs/g.ll -o %t.g.bc
-# RUN: llvm-ar cr %t.fg.a %t.f.bc %t.g.bc
-# RUN: llvm-ar cr %t.empty.lib
+# RUN: llvm-ar cr --format=gnu %t.fg.a %t.f.bc %t.g.bc
+# RUN: llvm-ar cr --format=gnu  %t.empty.lib
 # RUN: llvm-link %S/Inputs/h.ll %t.fg.a %t.empty.lib -o %t.linked.bc
 
 # RUN: llvm-nm %t.linked.bc | FileCheck %s
diff --git a/llvm/test/tools/llvm-lipo/create-archive-input.test b/llvm/test/tools/llvm-lipo/create-archive-input.test
--- a/llvm/test/tools/llvm-lipo/create-archive-input.test
+++ b/llvm/test/tools/llvm-lipo/create-archive-input.test
@@ -1,21 +1,19 @@
-# XFAIL: system-aix
-
 # RUN: yaml2obj %p/Inputs/i386-slice.yaml -o %t-i386.o
 # RUN: yaml2obj %p/Inputs/x86_64-slice.yaml -o %t-x86_64.o
 # RUN: yaml2obj %p/Inputs/i386-x86_64-universal.yaml -o %t-universal.o
 # RUN: llvm-as %p/Inputs/armv7-ios.ll -o %t-ir-armv7.o
 # RUN: llvm-as %p/Inputs/x64-osx.ll -o %t-ir-x86_64.o
 
-# RUN: llvm-ar cr %t.empty.a
+# RUN: llvm-ar --format=gnu cr %t.empty.a
 # RUN: not llvm-lipo %t.empty.a -create -output /dev/null 2>&1 | FileCheck --check-prefix=EMPTY-ARCHIVE %s
 
-# RUN: llvm-ar cr %t.different_architectures.a %t-i386.o %t-x86_64.o
+# RUN: llvm-ar --format=gnu cr %t.different_architectures.a %t-i386.o %t-x86_64.o
 # RUN: not llvm-lipo %t.different_architectures.a -create -output /dev/null 2>&1 | FileCheck --check-prefix=ARCHIVE-WITH-DIFFERENT-ARCHS %s
 
-# RUN: llvm-ar cr %t.contains_fat_binary.a %t-universal.o 
+# RUN: llvm-ar --format=gnu cr %t.contains_fat_binary.a %t-universal.o 
 # RUN: not llvm-lipo %t.contains_fat_binary.a -create -output /dev/null 2>&1 | FileCheck --check-prefix=ARCHIVE-WITH-FAT-BINARY %s
 
-# RUN: llvm-ar cr %t-i386-lib.a %t-i386.o
+# RUN: llvm-ar --format=gnu cr %t-i386-lib.a %t-i386.o
 # RUN: llvm-lipo %t-i386-lib.a %t-x86_64.o -create -output %t-i386-x86_64-universal.o
 # RUN: llvm-lipo %t-i386-x86_64-universal.o -info | FileCheck --check-prefix=INFO-i386-x86_64 %s
 # RUN: llvm-lipo %t-i386-x86_64-universal.o -thin i386 -output %t-extracted-i386-lib.a
@@ -23,18 +21,18 @@
 # RUN: llvm-lipo %t-i386-x86_64-universal.o -thin x86_64 -output %t-extracted-x86_64.o
 # RUN: cmp %t-extracted-x86_64.o %t-x86_64.o
 
-# RUN: llvm-ar cr %t-ir-armv7-lib.a %t-ir-armv7.o
+# RUN: llvm-ar --format=gnu cr %t-ir-armv7-lib.a %t-ir-armv7.o
 # RUN: llvm-lipo %t-ir-armv7-lib.a %t-ir-x86_64.o -create -output %t-ir-armv7-x86_64-universal.o
 # RUN: llvm-lipo %t-ir-armv7-x86_64-universal.o -thin armv7 -output %t-ir-extracted-armv7-lib.a
 # RUN: cmp %t-ir-extracted-armv7-lib.a %t-ir-armv7-lib.a
 # RUN: llvm-lipo %t-ir-armv7-x86_64-universal.o -thin x86_64 -output %t-ir-extracted-x86_64.o
 # RUN: cmp %t-ir-extracted-x86_64.o %t-ir-x86_64.o
 
-# RUN: llvm-ar cr %t.different_types0.a %t-i386.o %t-ir-x86_64.o
+# RUN: llvm-ar --format=gnu cr %t.different_types0.a %t-i386.o %t-ir-x86_64.o
 # RUN: not llvm-lipo -create %t.different_types0.a -output /dev/null 2>&1 | FileCheck --check-prefix=ARCHIVE-WITH-MACHO-AND-IR %s
-# RUN: llvm-ar cr %t.different_types1.a %t-ir-x86_64.o %t-i386.o 
+# RUN: llvm-ar --format=gnu cr %t.different_types1.a %t-ir-x86_64.o %t-i386.o 
 # RUN: not llvm-lipo -create %t.different_types1.a -output /dev/null 2>&1 | FileCheck --check-prefix=ARCHIVE-WITH-IR-AND-MACHO %s
-# RUN: llvm-ar cr %t.different_architectures_ir.a %t-ir-x86_64.o %t-ir-armv7.o
+# RUN: llvm-ar --format=gnu cr %t.different_architectures_ir.a %t-ir-x86_64.o %t-ir-armv7.o
 # RUN: not llvm-lipo -create %t.different_architectures_ir.a -output /dev/null 2>&1 | FileCheck --check-prefix=ARCHIVE-WITH-DIFFERENT-ARCHS %s
 
 # EMPTY-ARCHIVE: empty archive
diff --git a/llvm/test/tools/llvm-objcopy/MachO/universal-object.test b/llvm/test/tools/llvm-objcopy/MachO/universal-object.test
--- a/llvm/test/tools/llvm-objcopy/MachO/universal-object.test
+++ b/llvm/test/tools/llvm-objcopy/MachO/universal-object.test
@@ -1,4 +1,3 @@
-# XFAIL: system-aix
 # This test verifies that llvm-objcopy copies a univeral Mach-O object file properly.
 
 # RUN: yaml2obj %p/Inputs/i386.yaml -o %t.i386
@@ -15,7 +14,7 @@
 
 ## Case 2: copy a universal object file containing an archive.
 # RUN: rm -f %t.archive.i386
-# RUN: llvm-ar cr %t.archive.i386 %t.i386
+# RUN: llvm-ar --format=gnu cr %t.archive.i386 %t.i386
 # RUN: llvm-lipo %t.archive.i386 %t.x86_64 -create -output %t.universal.containing.archive
 # RUN: llvm-objcopy %t.universal.containing.archive %t.universal.containing.archive.copy
 # RUN: llvm-lipo %t.universal.containing.archive.copy -archs | FileCheck --check-prefix=VERIFY_ARCHS %s
@@ -25,7 +24,7 @@
 # RUN: cmp %t.x86_64 %t.archive.x86_64.copy
 
 ## Case 3: copy an archive containing a universal object.
-# RUN: llvm-ar cr %t.archive.containing.universal %t.universal
+# RUN: llvm-ar --format=gnu cr %t.archive.containing.universal %t.universal
 # RUN: llvm-objcopy %t.archive.containing.universal %t.archive.containing.universal.copy
 
 ## Case 4: try to copy a universal object file contaning a bitcode slice.
@@ -35,7 +34,7 @@
 # RUN:  | FileCheck --check-prefix=UNSUPPORTED_UNIVERSAL_OBJECT %s
 
 ## Case 5: try to copy an archive containing an unsupported universal object.
-# RUN: llvm-ar cr %t.archive.universal.bitcode %t.universal.containing.bitcode
+# RUN: llvm-ar --format=gnu cr %t.archive.universal.bitcode %t.universal.containing.bitcode
 # RUN: not llvm-objcopy %t.archive.universal.bitcode %t.archive.universal.bitcode.copy 2>&1 \
 # RUN:  | FileCheck --check-prefix=UNSUPPORTED_UNIVERSAL_OBJECT %s