Add -funique-section-names and -fno-unique-section-names options.

For now -funique-section-names is the default, so no change in default behavior.

The total .o size in a build of llvm and clang goes from 241687775 to 230649031
bytes if -fno-unique-section-names is used.

llvm-svn: 230031

3 files changed, 8 insertions, 0 deletions

diff --git a/clang/lib/CodeGen/BackendUtil.cpp b/clang/lib/CodeGen/BackendUtil.cpp
index 7442f4374ca..da3e5ce6795 100644
--- a/clang/lib/CodeGen/BackendUtil.cpp
+++ b/clang/lib/CodeGen/BackendUtil.cpp
@@ -527,6 +527,7 @@ TargetMachine *EmitAssemblyHelper::CreateTargetMachine(bool MustCreateTM) {
   Options.PositionIndependentExecutable = LangOpts.PIELevel != 0;
   Options.FunctionSections = CodeGenOpts.FunctionSections;
   Options.DataSections = CodeGenOpts.DataSections;
+  Options.UniqueSectionNames = CodeGenOpts.UniqueSectionNames;
 
   Options.MCOptions.MCRelaxAll = CodeGenOpts.RelaxAll;
   Options.MCOptions.MCSaveTempLabels = CodeGenOpts.SaveTempLabels;
diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index b5f20608c14..dd878d0dfcd 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -3316,6 +3316,10 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
     CmdArgs.push_back("-fdata-sections");
   }
 
+  if (!Args.hasFlag(options::OPT_funique_section_names,
+                    options::OPT_fno_unique_section_names, true))
+    CmdArgs.push_back("-fno-unique-section-names");
+
   Args.AddAllArgs(CmdArgs, options::OPT_finstrument_functions);
 
   if (Args.hasArg(options::OPT_fprofile_instr_generate) &&
diff --git a/clang/lib/Frontend/CompilerInvocation.cpp b/clang/lib/Frontend/CompilerInvocation.cpp
index 7a53cedc93b..bfd9429dace 100644
--- a/clang/lib/Frontend/CompilerInvocation.cpp
+++ b/clang/lib/Frontend/CompilerInvocation.cpp
@@ -472,6 +472,9 @@ static bool ParseCodeGenArgs(CodeGenOptions &Opts, ArgList &Args, InputKind IK,
                                        OPT_fno_function_sections, false);
   Opts.DataSections = Args.hasFlag(OPT_fdata_sections,
                                    OPT_fno_data_sections, false);
+  Opts.UniqueSectionNames = Args.hasFlag(OPT_funique_section_names,
+                                         OPT_fno_unique_section_names, true);
+
   Opts.MergeFunctions = Args.hasArg(OPT_fmerge_functions);
 
   Opts.MSVolatile = Args.hasArg(OPT_fms_volatile);