[llvm-objcopy][llvm-strip] Add switch to allow removing referenced sections

llvm-objcopy currently emits an error if a section to be removed is
referenced by another section. This is a reasonable thing to do, but is
different to GNU objcopy. We should allow users who know what they are
doing to have a way to produce the invalid ELF. This change adds a new
switch --allow-broken-links to both llvm-strip and llvm-objcopy to do
precisely that. The corresponding sh_link field is then set to 0 instead
of an error being emitted.

I cannot use llvm-readelf/readobj to test the link fields because they
emit an error if any sections, like the .dynsym, cannot be properly
loaded.

Reviewed by: rupprecht, grimar

Differential Revision: https://reviews.llvm.org/D60324

llvm-svn: 358649

1 files changed, 1 insertions, 0 deletions

diff --git a/llvm/tools/llvm-objcopy/CopyConfig.h b/llvm/tools/llvm-objcopy/CopyConfig.h
index 8c025eb3891..fd548cc76e3 100644
--- a/llvm/tools/llvm-objcopy/CopyConfig.h
+++ b/llvm/tools/llvm-objcopy/CopyConfig.h
@@ -149,6 +149,7 @@ struct CopyConfig {
   std::function<uint64_t(uint64_t)> EntryExpr;
 
   // Boolean options
+  bool AllowBrokenLinks = false;
   bool DeterministicArchives = true;
   bool ExtractDWO = false;
   bool KeepFileSymbols = false;