Patrick Williams | c124f4f | 2015-09-15 14:41:29 -0500 | [diff] [blame] | 1 | From 508ca17a7be01d1cc960d9a07d0af4513948fb8d Mon Sep 17 00:00:00 2001 |
| 2 | From: Thierry Reding <treding@nvidia.com> |
| 3 | Date: Fri, 27 Jun 2014 08:40:33 +0200 |
| 4 | Subject: [PATCH] Link libunwind to libgcc_s rather than libgcc |
| 5 | |
| 6 | For some architectures, -lgcc and -lgcc_s are not equivalent. On ARM for |
| 7 | example, libgcc_s.so.1 contains some symbols needed by libunwind which |
| 8 | are not present in libgcc. |
| 9 | |
| 10 | This causes the following link error when building the X.Org X server |
| 11 | with libunwind support: |
| 12 | |
| 13 | CCLD Xorg |
| 14 | /usr/lib/libunwind.so: undefined reference to `__aeabi_unwind_cpp_pr0' |
| 15 | /usr/lib/libunwind.so: undefined reference to `__aeabi_unwind_cpp_pr1' |
| 16 | |
| 17 | Linking against libgcc_s explicitly solves this problem. |
| 18 | |
| 19 | Upstream-Status: Backport |
| 20 | |
| 21 | Signed-off-by: Thierry Reding <treding@nvidia.com> |
| 22 | Signed-off-by: Jonathan Liu <net147@gmail.com> |
| 23 | --- |
| 24 | configure.ac | 2 +- |
| 25 | 1 file changed, 1 insertion(+), 1 deletion(-) |
| 26 | |
| 27 | diff --git a/configure.ac b/configure.ac |
| 28 | index cffe19b..3beb5f2 100644 |
| 29 | --- a/configure.ac |
| 30 | +++ b/configure.ac |
| 31 | @@ -258,7 +258,7 @@ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[#ifndef __INTEL_COMPILER |
| 32 | |
| 33 | if test x$GCC = xyes -a x$intel_compiler != xyes; then |
| 34 | CFLAGS="${CFLAGS} -fexceptions -Wall -Wsign-compare" |
| 35 | - LIBCRTS="-lgcc" |
| 36 | + LIBCRTS="-lgcc_s" |
| 37 | fi |
| 38 | AC_MSG_RESULT([$intel_compiler]) |
| 39 | |
| 40 | -- |
| 41 | 2.3.2 |
| 42 | |