Add support to find DWARF call fame info in shared libraries.

This makes DWARF-based exception handling work for shared libraries and
dynamic executables.
ok drahn@, millert@, pval@

3 files changed, 19 insertions, 0 deletions

diff --git a/gnu/usr.bin/gcc/gcc/config/openbsd.h b/gnu/usr.bin/gcc/gcc/config/openbsd.h
index 8ccc385000d..96f6ee1c8ef 100644
--- a/gnu/usr.bin/gcc/gcc/config/openbsd.h
+++ b/gnu/usr.bin/gcc/gcc/config/openbsd.h
@@ -153,6 +153,10 @@ Boston, MA 02111-1307, USA.  */
   "%{g:%{!nostdlib:-L/usr/lib/debug}} %{!shared:%{!nostdlib:%{!r*:%{!e*:-e start}}}} %{shared:-Bshareable -x} -dc -dp %{R*} %{static:-Bstatic} %{assert*}"
 #endif
 
+#if defined(HAVE_LD_EH_FRAME_HDR)
+#define LINK_EH_SPEC "%{!static:--eh-frame-hdr} "
+#endif
+
 #undef LIB_SPEC
 #define LIB_SPEC OBSD_LIB_SPEC
 #endif
diff --git a/gnu/usr.bin/gcc/gcc/config/t-openbsd b/gnu/usr.bin/gcc/gcc/config/t-openbsd
index 0578cbd6225..91d7b7ede4e 100644
--- a/gnu/usr.bin/gcc/gcc/config/t-openbsd
+++ b/gnu/usr.bin/gcc/gcc/config/t-openbsd
@@ -3,3 +3,9 @@ STMP_FIXPROTO =
 
 # We don't need GCC's own include files.
 USER_H =
+
+# Use unwind-dw2-fde-openbsd
+LIB2ADDEH = $(srcdir)/unwind-dw2.c $(srcdir)/unwind-dw2-fde-openbsd.c \
+  $(srcdir)/unwind-sjlj.c $(srcdir)/unwind-c.c
+LIB2ADDEHDEP = unwind.inc unwind-dw2-fde.h unwind-dw2-fde.c \
+  unwind-dw2-fde-glibc.c
diff --git a/gnu/usr.bin/gcc/gcc/unwind-dw2-fde-openbsd.c b/gnu/usr.bin/gcc/gcc/unwind-dw2-fde-openbsd.c
new file mode 100644
index 00000000000..69310d9a32d
--- /dev/null
+++ b/gnu/usr.bin/gcc/gcc/unwind-dw2-fde-openbsd.c
@@ -0,0 +1,9 @@
+/* XXX This file provides a few defines such that we can compile the
+   source from unwind-dw2-fde-glibc.c on OpenBSD.  Hopefully we can
+   integrate these defines in that file and rename it to something
+   like unwind-de2-fde-phdr.c in the up-stream sources.  */
+
+#define ElfW(type) Elf_##type
+
+#define __GLIBC__ 3		/* Fool unwind-dw2-fde-glibc.c.  */
+#include "unwind-dw2-fde-glibc.c"