[llvm-objcopy] Dwarf .debug section compression support (zlib, zlib-gnu).

  Third Attempt:
    - Alignment issues resolved.
    - zlib::isAvailable() detected.
    - ArrayRef misuse fixed.

  Usage:

  llvm-objcopy --compress-debug-sections=zlib foo.o
  llvm-objcopy --compress-debug-sections=zlib-gnu foo.o

  In both cases the debug section contents is compressed with zlib. In the GNU
  style case the header is the "ZLIB" magic string followed by the uint64 big-
  endian decompressed size. In the non-GNU mode the header is the
  Elf(32|64)_Chdr.

  Decompression support is coming soon.

  Differential Revision: https://reviews.llvm.org/D49678

llvm-svn: 341635

1 files changed, 9 insertions, 0 deletions

diff --git a/llvm/test/tools/llvm-objcopy/compress-debug-sections-default-gnu.test b/llvm/test/tools/llvm-objcopy/compress-debug-sections-default-gnu.test
new file mode 100644
index 00000000000..9db3d3b7f9c
--- /dev/null
+++ b/llvm/test/tools/llvm-objcopy/compress-debug-sections-default-gnu.test
@@ -0,0 +1,9 @@
+# REQUIRES: zlib
+
+# RUN: yaml2obj %p/Inputs/compress-debug-sections.yaml -o %t.o
+# RUN: llvm-objcopy --compress-debug-sections --compress-debug-sections=zlib-gnu %t.o %t-compressed.o
+# RUN: llvm-objdump -s %t-compressed.o | FileCheck %s
+
+# CHECK: .zdebug_foo:
+# CHECK: ZLIB
+