diff --git a/llvm/include/llvm/MC/MCAsmInfo.h b/llvm/include/llvm/MC/MCAsmInfo.h
--- a/llvm/include/llvm/MC/MCAsmInfo.h
+++ b/llvm/include/llvm/MC/MCAsmInfo.h
@@ -215,9 +215,9 @@
   const char *TPRel64Directive = nullptr;
 
   /// This is true if this target uses "Sun Style" syntax for section switching
-  /// ("#alloc,#write" etc) instead of the normal ELF syntax (,"a,w") in
-  /// .section directives.  Defaults to false.
-  bool SunStyleELFSectionSwitchSyntax = false;
+  /// ("#alloc,#write" etc) along the normal ELF syntax (,"a,w") in
+  /// .section directives.  Defaults to true.
+  bool SunStyleELFSectionSwitchSyntax = true;
 
   /// This is true if this target uses ELF '.section' directive before the
   /// '.bss' one. It's used for PPC/Linux which doesn't support the '.bss'
diff --git a/llvm/test/MC/AsmParser/gas-compl-sun-elf.s b/llvm/test/MC/AsmParser/gas-compl-sun-elf.s
new file mode 100644
--- /dev/null
+++ b/llvm/test/MC/AsmParser/gas-compl-sun-elf.s
@@ -0,0 +1,13 @@
+@ RUN: llvm-mc -filetype=obj -triple arm-linux-gnu %s -o - | llvm-readelf --sections | FileCheck %s
+
+@ CHECK: .f1              PROGBITS        00000000 000034 000000 00   A  0   0  1
+.section ".f1", #alloc
+
+@ CHECK: .f2              PROGBITS        00000000 000034 000000 00   W  0   0  1
+.section ".f2", #write
+
+@ CHECK: .f3              PROGBITS        00000000 000034 000000 00   A  0   0  1
+.section ".f3", "a"
+
+@ CHECK: .f4              PROGBITS        00000000 000034 000000 00   W  0   0  1
+.section ".f4", "w"