Index: lld/ELF/ScriptParser.cpp
===================================================================
--- lld/ELF/ScriptParser.cpp
+++ lld/ELF/ScriptParser.cpp
@@ -695,22 +695,34 @@
 ScriptParser::readInputSectionDescription(StringRef tok) {
   // Input section wildcard can be surrounded by KEEP.
   // https://sourceware.org/binutils/docs/ld/Input-Section-Keep.html#Input-Section-Keep
-  uint64_t withFlags = 0;
-  uint64_t withoutFlags = 0;
   if (tok == "KEEP") {
     expect("(");
-    if (consume("INPUT_SECTION_FLAGS"))
-      std::tie(withFlags, withoutFlags) = readInputSectionFlags();
     InputSectionDescription *cmd =
-        readInputSectionRules(next(), withFlags, withoutFlags);
+        peek() == "INPUT_SECTION_FLAGS"
+            ? readInputSectionDescription(next())
+            : readInputSectionRules(next(), /*withFlags=*/0,
+                                    /*withoutFlags*/ 0);
     expect(")");
     script->keptSections.push_back(cmd);
     return cmd;
   }
+
+  uint64_t withFlags = 0;
+  uint64_t withoutFlags = 0;
   if (tok == "INPUT_SECTION_FLAGS") {
     std::tie(withFlags, withoutFlags) = readInputSectionFlags();
     tok = next();
   }
+
+  if (peek() != "(") {
+    // We have a file name and no input sections description. It is not a
+    // commonly used syntax, but still acceptable. In that case, all sections
+    // from the file will be included.
+    auto *isd = make<InputSectionDescription>(tok, withFlags, withoutFlags);
+    isd->sectionPatterns.push_back({{}, StringMatcher("*")});
+    return isd;
+  }
+
   return readInputSectionRules(tok, withFlags, withoutFlags);
 }
 
@@ -849,18 +861,8 @@
       readSort();
     } else if (tok == "INCLUDE") {
       readInclude();
-    } else if (peek() == "(") {
-      cmd->sectionCommands.push_back(readInputSectionDescription(tok));
     } else {
-      // We have a file name and no input sections description. It is not a
-      // commonly used syntax, but still acceptable. In that case, all sections
-      // from the file will be included.
-      // FIXME: GNU ld permits INPUT_SECTION_FLAGS to be used here. We do not
-      // handle this case here as it will already have been matched by the
-      // case above.
-      auto *isd = make<InputSectionDescription>(tok);
-      isd->sectionPatterns.push_back({{}, StringMatcher("*")});
-      cmd->sectionCommands.push_back(isd);
+      cmd->sectionCommands.push_back(readInputSectionDescription(tok));
     }
   }
 
Index: lld/test/ELF/input-section-flags.s
===================================================================
--- lld/test/ELF/input-section-flags.s
+++ lld/test/ELF/input-section-flags.s
@@ -59,6 +59,20 @@
 # RUN: ld.lld -o %t3 --script %t3.script %t.o
 # RUN: llvm-readobj --symbols %t3 | FileCheck %s
 
+## Same test but using just a filespec.
+# RUN: echo "SECTIONS { \
+# RUN: .outsec1 : { INPUT_SECTION_FLAGS(SHF_ALLOC & !SHF_EXECINSTR & \
+# RUN:                                  !SHF_WRITE & !SHF_MERGE) *.o }\
+# RUN: .outsec2 : { INPUT_SECTION_FLAGS(SHF_ALLOC & SHF_EXECINSTR & !SHF_WRITE\
+# RUN:                                  & !SHF_MERGE) *.o } \
+# RUN: .outsec3 : { INPUT_SECTION_FLAGS(SHF_WRITE) *.o } \
+# RUN: .outsec4 : { INPUT_SECTION_FLAGS(SHF_MERGE & !SHF_STRINGS) * } \
+# RUN: .outsec5 : { INPUT_SECTION_FLAGS(SHF_STRINGS) * } \
+# RUN: } " > %t4.script
+
+# RUN: ld.lld -o %t4 --script %t4.script %t.o
+# RUN: llvm-readobj --symbols %t4 | FileCheck %s
+
 ## Check that we can handle multiple InputSectionDescriptions in a single
 ## OutputSection
 # RUN: echo "SECTIONS { \
@@ -66,10 +80,10 @@
 # RUN:                                  !SHF_WRITE & !SHF_MERGE) *(.sec.*) ; \
 # RUN:              INPUT_SECTION_FLAGS(SHF_ALLOC & SHF_EXECINSTR & !SHF_WRITE\
 # RUN:                                  & !SHF_MERGE)  *(.sec.* *.text) }\
-# RUN: } " > %t4.script
+# RUN: } " > %t5.script
 
-# RUN: ld.lld -o %t4 --script %t4.script %t.o
-# RUN: llvm-readobj --symbols %t4 | FileCheck --check-prefix MULTIPLE %s
+# RUN: ld.lld -o %t5 --script %t5.script %t.o
+# RUN: llvm-readobj --symbols %t5 | FileCheck --check-prefix MULTIPLE %s
 
 # MULTIPLE:  Name: _start
 # MULTIPLE:  Section: .outsec1