diff --git a/lld/MachO/InputFiles.cpp b/lld/MachO/InputFiles.cpp
--- a/lld/MachO/InputFiles.cpp
+++ b/lld/MachO/InputFiles.cpp
@@ -251,7 +251,7 @@
                                               path.copy(bAlloc));
   }
 
-  error("unable to find matching architecture in " + path);
+  warn("unable to find matching architecture in " + path);
   return std::nullopt;
 }
 
diff --git a/lld/test/MachO/fat-arch.s b/lld/test/MachO/fat-arch.s
--- a/lld/test/MachO/fat-arch.s
+++ b/lld/test/MachO/fat-arch.s
@@ -9,9 +9,9 @@
 # RUN: llvm-lipo %t.i386.o %t.x86_64.o -create -o %t.fat.o
 # RUN: %lld -o /dev/null %t.fat.o
 # RUN: llvm-lipo %t.i386.o -create -o %t.noarch.o
-# RUN: not %lld -o /dev/null %t.noarch.o 2>&1 | \
+# RUN: not %no-fatal-warnings-lld -o /dev/null %t.noarch.o 2>&1 | \
 # RUN:    FileCheck %s -DFILE=%t.noarch.o
-# CHECK: error: unable to find matching architecture in [[FILE]]
+# CHECK: warning: unable to find matching architecture in [[FILE]]
 
 ## Validates that we read the cpu-subtype correctly from a fat exec.
 # RUN: %lld -o %t.x86_64.out %t.x86_64.o
@@ -25,7 +25,7 @@
 
 # CPU-SUB:            magic     cputype      cpusubtype   caps      filetype   ncmds sizeofcmds      flags
 # CPU-SUB-NEXT:  0xfeedfacf     16777223              3  0x{{.+}}    {{.+}}  {{.+}}    {{.+}}      {{.+}}
-	
+
 # CPU-SUB: Fat headers
 # CPU-SUB: nfat_arch 2
 # CPU-SUB: architecture 0