Index: ELF/LinkerScript.cpp
===================================================================
--- ELF/LinkerScript.cpp
+++ ELF/LinkerScript.cpp
@@ -624,6 +624,11 @@
   if (CurAddressState->OutSec->Flags & SHF_COMPRESSED)
     return;
 
+  // The Size was previously calculated for compressed debug sections. We now
+  // reset it, because unused synthetic sections may have since been removed,
+  // leaving the Size invalid.
+  Sec->Size = 0;
+
   for (BaseCommand *C : Sec->Commands)
     process(*C);
 }
Index: test/ELF/linkerscript/unused-synthetic.s
===================================================================
--- test/ELF/linkerscript/unused-synthetic.s
+++ test/ELF/linkerscript/unused-synthetic.s
@@ -13,6 +13,16 @@
 # CHECK:      .text
 # CHECK-NEXT: .dynsym
 
+# Test that the size of a removed unused synthetic input section does not get
+# added to the output section size, if the output section has symbol
+# assignments, preventing removal of the output section.
+# RUN: echo "SECTIONS { \
+# RUN:    .got.plt : { a_sym = .; *(.got.plt) } \
+# RUN:  }" > %t2.script
+# RUN: ld.lld -shared -o %t2.so --script %t2.script %t.o
+# RUN: llvm-objdump -section-headers %t2.so | FileCheck %s --check-prefix=CHECK2
+# CHECK2: .got.plt 00000000
+
 .global _start
 _start:
   nop