Add ARM-specific static-stubs.c

["Joseph S. Myers" <joseph@codesourcery.com>]

While the ARM changes I included with my patch to avoid libgcc_s / 
libgcc_eh were sufficient to keep the ARM glibc build working in cases 
that had already worked without special hacks, it turns out they weren't 
quite sufficient to get the ARM build to start working when using a 
compiler without libgcc_s / libgcc_eh.

With such a compiler, some of the unwind functionality is present in 
libgcc.a (whereas with a compiler built with shared libgcc, it's separate 
in libgcc_s and libgcc_eh).  The copy of _Unwind_Resume from 
static-stubs.c is properly used in static links - but libgcc gets used 
before ARM's libgcc-stubs.a, so __aeabi_unwind_cpp_pr* get pulled in from 
libgcc, which ends up conflicting with the copy of _Unwind_Resume from 
static-stubs.c.  So in fact the stub __aeabi_unwind_cpp_pr* need providing 
in two places:

* In static-stubs.c (via a #include of aeabi_unwind_cpp_pr1.c), for static 
links with a compiler with libgcc.a only.

* In libgcc-stubs.a, for linking other executables and shared libraries.

I've applied this patch to get the ARM build working with a compiler with 
static-only libgcc, though I'll think some more about whether better 
approaches are possible.

diff --git a/ports/ChangeLog.arm b/ports/ChangeLog.arm
index 71e8b1b..8cd383d 100644
--- a/ports/ChangeLog.arm
+++ b/ports/ChangeLog.arm
@@ -1,3 +1,7 @@
+2012-07-05  Joseph Myers  <joseph@codesourcery.com>
+
+	* sysdeps/arm/static-stubs.c: New file.
+
 2012-07-03  Joseph Myers  <joseph@codesourcery.com>
 
 	* sysdeps/arm/Makefile (gnulib-arch): New variable.
diff --git a/ports/sysdeps/arm/static-stubs.c b/ports/sysdeps/arm/static-stubs.c
new file mode 100644
index 0000000..d90d603
--- /dev/null
+++ b/ports/sysdeps/arm/static-stubs.c
@@ -0,0 +1,7 @@
+/* When building with GCC with static-only libgcc, the dummy
+   _Unwind_Resume from static-stubs.c needs to be used together with
+   the dummy __aeabi_unwind_cpp_pr* from aeabi_unwind_cpp_pr1.c
+   instead of the copies from libgcc.  */
+
+#include <elf/static-stubs.c>
+#include <aeabi_unwind_cpp_pr1.c>

-- 
Joseph S. Myers
joseph@codesourcery.com