[DWARF5][SplitDwarf] Set default state for -fsplit-dwarf-inlining to be false.

    The -fsplit-dwarf-inlining option does not conform to DWARF5 standard.
It creates children for Skeleton compilation unit. We need default behavior
to be DWARF5 compatible. Thus set default state for -fsplit-dwarf-inlining
into "false".

Differential Revision: https://reviews.llvm.org/D71304

Author: avl-llvm

clang/lib/Driver/ToolChains/Clang.cpp

@@ -3539,7 +3539,7 @@ static void RenderDebugOptions(const ToolChain &TC, const Driver &D,
 
   bool SplitDWARFInlining =
       Args.hasFlag(options::OPT_fsplit_dwarf_inlining,
-                   options::OPT_fno_split_dwarf_inlining, true);
+                   options::OPT_fno_split_dwarf_inlining, false);
 
   Args.ClaimAllArgs(options::OPT_g_Group);
 

clang/test/Driver/split-debug.c

@@ -61,6 +61,9 @@
 // CHECK-GMLT-WITH-SPLIT: "-split-dwarf-file"
 // CHECK-GMLT-WITH-SPLIT: "-split-dwarf-output"
 
+// RUN: %clang -target x86_64-unknown-linux-gnu -g -S -### %s 2> %t
+// RUN: FileCheck -check-prefix=CHECK-NOINLINE-WITHOUT-SPLIT < %t %s
+//
 // RUN: %clang -target x86_64-unknown-linux-gnu -g -fno-split-dwarf-inlining -S -### %s 2> %t
 // RUN: FileCheck -check-prefix=CHECK-NOINLINE-WITHOUT-SPLIT < %t %s
 //
@@ -79,7 +82,7 @@
 // CHECK-SPLIT-WITH-NOINL: "-debug-info-kind=limited"
 // CHECK-SPLIT-WITH-NOINL: "-split-dwarf-output"
 
-// RUN: %clang -target x86_64-unknown-linux-gnu -gsplit-dwarf -gmlt -S -### %s 2> %t
+// RUN: %clang -target x86_64-unknown-linux-gnu -gsplit-dwarf -gmlt -fsplit-dwarf-inlining -S -### %s 2> %t
 // RUN: FileCheck -check-prefix=CHECK-GMLT-OVER-SPLIT < %t %s
 //
 // CHECK-GMLT-OVER-SPLIT: "-debug-info-kind=line-tables-only"