[PATCH 11/13] unwind fix for musl

[Szabolcs Nagy]

dl_iterate_phdr depends on USE_PT_GNU_EH_FRAME.

I think USE_PT_GNU_EH_FRAME could be enabled more generally (whenever
libc provides dl_iterate_phdr), but I only made a conservative change.


libgcc/Changelog:

2015-04-16  Gregor Richards  <gregor.richa...@uwaterloo.ca>
            Szabolcs Nagy  <szabolcs.n...@arm.com>

        * unwind-dw2-fde-dip.c (USE_PT_GNU_EH_FRAME): Define it on
        Linux if target provides dl_iterate_phdr.

diff --git a/libgcc/unwind-dw2-fde-dip.c b/libgcc/unwind-dw2-fde-dip.c
index e1e566b..137dced 100644
--- a/libgcc/unwind-dw2-fde-dip.c
+++ b/libgcc/unwind-dw2-fde-dip.c
@@ -59,6 +59,12 @@
 
 #if !defined(inhibit_libc) && defined(HAVE_LD_EH_FRAME_HDR) \
     && defined(TARGET_DL_ITERATE_PHDR) \
+    && defined(__linux__)
+# define USE_PT_GNU_EH_FRAME
+#endif
+
+#if !defined(inhibit_libc) && defined(HAVE_LD_EH_FRAME_HDR) \
+    && defined(TARGET_DL_ITERATE_PHDR) \
     && (defined(__DragonFly__) || defined(__FreeBSD__))
 # define ElfW __ElfN
 # define USE_PT_GNU_EH_FRAME