--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lld/test/COFF/failifmismatch.test	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,32 @@
+REQUIRES: x86
+
+RUN: lld-link /entry:main /subsystem:console /out:%t.exe \
+RUN:   %p/Inputs/ret42.obj
+
+RUN: lld-link /entry:main /subsystem:console /out:%t.exe \
+RUN:   %p/Inputs/ret42.obj /failifmismatch:k1=v1 /failifmismatch:k2=v1
+
+RUN: lld-link /entry:main /subsystem:console /out:%t.exe \
+RUN:   %p/Inputs/ret42.obj /failifmismatch:k1=v1 /failifmismatch:k1=v1
+
+RUN: not lld-link /entry:main /subsystem:console /out:%t.exe \
+RUN:   %p/Inputs/ret42.obj /failifmismatch:k1=v1 /failifmismatch:k1=v2 2>&1 | FileCheck %s 
+
+RUN: llc < %p/Inputs/failmismatch1.ll -mtriple x86_64-windows-msvc -filetype obj -o %t1.obj
+RUN: llc < %p/Inputs/failmismatch2.ll -mtriple x86_64-windows-msvc -filetype obj -o %t2.obj
+RUN: not lld-link %t1.obj %t2.obj 2>&1 | FileCheck %s -check-prefix OBJ
+
+RUN: llvm-lib %t1.obj /out:%t.lib
+RUN: not lld-link %t.lib %t2.obj 2>&1 | FileCheck %s -check-prefix LIB
+
+CHECK: lld-link: error: /failifmismatch: mismatch detected for 'k1':
+CHECK-NEXT: >>> cmd-line has value v1
+CHECK-NEXT: >>> cmd-line has value v2
+
+OBJ: lld-link: error: /failifmismatch: mismatch detected for 'TEST':
+OBJ-NEXT: >>> {{.*}}failifmismatch.test.tmp1.obj has value 1
+OBJ-NEXT: >>> {{.*}}failifmismatch.test.tmp2.obj has value 2
+
+LIB: lld-link: error: /failifmismatch: mismatch detected for 'TEST':
+LIB-NEXT: >>> {{.*}}failifmismatch.test.tmp2.obj has value 2
+LIB-NEXT: >>> failifmismatch.test.tmp.lib(failifmismatch.test.tmp1.obj) has value 1