tree f7c96fdd43bb69a16bbbbadfa643ef01d6118a0c
parent 27edc0bcdf42ae9b1a807c49b7eaa9770cec56e5
author Logan Chien <tzuhsiang.chien@gmail.com> 1450795110 +0000
committer Dan Albert <danalbert@google.com> 1451934679 -0800

Fix ARM __cxa_end_cleanup() and gc-sections.

This commit adds SHF_ALLOC and SHF_EXECINSTR section flags to
`.text.__cxa_end_cleanup` section.  This fixes a link error when we are
using integrated-as and `ld.gold` (with `-Wl,--gc-sections` and
`-Wl,--fatal-warnings`.)

Detailed Explanation:

1. There might be some problem with LLVM integrated-as.  It is not
   emitting any section flags for text sections.  (This will be fixed in
   an independent commit.)

2. `ld.gold` will skip the external symbols in the section without
   SHF_ALLOC.  This is the reason why `.text.__cxa_end_cleanup_impl`
   section is discarded even though it is referenced by
   `__cxa_end_cleanup()`.

This commit workaround the problem by specifying the section flags
explicitly.

Fix http://llvm.org/PR21292

git-svn-id: https://llvm.org/svn/llvm-project/libcxxabi/trunk@256241 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit f67395cccae6049982ad67530f406624cc0445ac)

Change-Id: Id477f4d8aa159ee8cfe6640ecc66aa27afe574c6