Reland "[llvm-objcopy] Add support for --strip-sections to remove all section headers leaving only program headers and loadable segment data"

ubsan caught an issue I made where I was converting a null pointer to a
reference.

elf utils implements a particularly extreme form of stripping that I'd
like to support. eu-strip has an option called "strip-sections" that
removes all section headers and leaves only program headers and the
segment data. I have implemented this option partly as a test but mainly
because in Fuchsia we would like to use this option to minimize the size
of our executables. The other strip options that are on my list include
--strip-all and --strip-debug. This is a preliminary implementation that
I'd like to start using in Fuchsia builds if possible. This change
implements such a stripping option for llvm-objcopy

Differential Revision: https://reviews.llvm.org/D38335

llvm-svn: 315484

1 files changed, 1 insertions, 0 deletions

diff --git a/llvm/tools/llvm-objcopy/Object.h b/llvm/tools/llvm-objcopy/Object.h
index 391465db65e..f6088434805 100644
--- a/llvm/tools/llvm-objcopy/Object.h
+++ b/llvm/tools/llvm-objcopy/Object.h
@@ -346,6 +346,7 @@ public:
   uint32_t Machine;
   uint32_t Version;
   uint32_t Flags;
+  bool WriteSectionHeaders = true;
 
   Object(const llvm::object::ELFObjectFile<ELFT> &Obj);
   void removeSections(std::function<bool(const SectionBase &)> ToRemove);