[LLVMdev] __eh_frame info changes in Clang?

[Jack Howarth]

Nick,
      Do you happen to know why the version reported in 'dwarfdump
--eh-frame' for object files now differs when compiled with and
without -g? The test used in FSF gcc's configure produces a diff of..

% diff -u conftest.o.g.stripped.dwarfdump conftest.o.g0.stripped.dwarfdump
--- conftest.o.g.stripped.dwarfdump 2015-04-10 21:43:15.000000000 -0400
+++ conftest.o.g0.stripped.dwarfdump 2015-04-10 21:43:04.000000000 -0400
@@ -1,5 +1,5 @@
 ----------------------------------------------------------------------
- File: conftest.o.g.stripped (x86_64)
+ File: conftest.o.g0.stripped (x86_64)
 ----------------------------------------------------------------------
 Exception handling frame information for section __eh_frame

when compiled with Clang 6.0 (3.5svn) but now produces...

% diff -u conftest.o.g.stripped.dwarfdump conftest.o.g0.stripped.dwarfdump
--- conftest.o.g.stripped.dwarfdump 2015-04-10 21:42:02.000000000 -0400
+++ conftest.o.g0.stripped.dwarfdump 2015-04-10 21:41:52.000000000 -0400
@@ -1,12 +1,12 @@
 ----------------------------------------------------------------------
- File: conftest.o.g.stripped (x86_64)
+ File: conftest.o.g0.stripped (x86_64)
 ----------------------------------------------------------------------
 Exception handling frame information for section __eh_frame

 0x00000000: CIE
         length: 0x00000014
         CIE_id: 0xffffffff
-       version: 0x01
+       version: 0x03
   augmentation: "zR"
     code_align: 1
     data_align: -8

when compiled with Clang 6.1 (3.6.0svn) or llvm.org clang 3.6.0. The
detailed steps to obtain those test files are listed at
https://llvm.org/bugs/show_bug.cgi?id=23192.
         Jack