[llvm-objcopy] Add --strip-debug

Many projects use this option. There are two ways to use it. You can
either a) Just use --strip-debug and keep the old file with debug
content or b) you can use --strip-debug, --only-keep-debug, and
--add-gnu-debuglink all in conjunction to create two separate files, the
stripped file and the debug file. --only-keep-debug is more complicated
than --strip-debug because it keeps the section headers without keeping
section contents. That's not really supported by llvm-objcopy at the
moment but I plan on adding it. So this change just supports a) and
options to support b) will come soon.

Differential Revision: https://reviews.llvm.org/D39919

llvm-svn: 318094

1 files changed, 8 insertions, 0 deletions

diff --git a/llvm/tools/llvm-objcopy/llvm-objcopy.cpp b/llvm/tools/llvm-objcopy/llvm-objcopy.cpp
index 12d6205722f..b520a1415c2 100644
--- a/llvm/tools/llvm-objcopy/llvm-objcopy.cpp
+++ b/llvm/tools/llvm-objcopy/llvm-objcopy.cpp
@@ -83,6 +83,8 @@ static cl::alias ToRemoveA("R", cl::desc("Alias for remove-section"),
                            cl::aliasopt(ToRemove));
 static cl::opt<bool> StripAll("strip-all",
                               cl::desc("Removes symbol, relocation, and debug information"));
+static cl::opt<bool> StripDebug("strip-debug",
+                                cl::desc("Removes all debug information"));
 static cl::opt<bool> StripSections("strip-sections",
                                    cl::desc("Remove all section headers"));
 static cl::opt<bool>
@@ -197,6 +199,12 @@ void CopyBinary(const ELFObjectFile<ELF64LE> &ObjFile) {
     Obj->WriteSectionHeaders = false;
   }
 
+  if (StripDebug) {
+    RemovePred = [RemovePred](const SectionBase &Sec) {
+      return RemovePred(Sec) || Sec.Name.startswith(".debug");
+    };
+  }
+
   Obj->removeSections(RemovePred);
   Obj->finalize();
   WriteObjectFile(*Obj, OutputFilename.getValue());