* src/unexmacosx.c (copy_data_segment): Port to GCC 4.6+ (backport)

Fixes: debbugs:9927

2 files changed, 26 insertions, 0 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 33ee723fe66..1fb2c7b00a1 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,7 @@
+2014-10-30  Samuel Bronson  <naesten@gmail.com>
+
+        * unexmacosx.c (copy_data_segment): Port to GCC 4.6+ (Bug#9927).
+
 2014-10-28  Eli Zaretskii  <eliz@gnu.org>
 
         * fileio.c (Fexpand_file_name): Use make_unibyte_string, not
diff --git a/src/unexmacosx.c b/src/unexmacosx.c
index 7d4762fdab2..2a045aa12f8 100644
--- a/src/unexmacosx.c
+++ b/src/unexmacosx.c
@@ -881,6 +881,27 @@ copy_data_segment (struct load_command *lc)
           if (!unexec_write (header_offset, sectp, sizeof (struct section)))
             unexec_error ("cannot write section %.16s's header", sectp->sectname);
         }
+      else if (strncmp (sectp->sectname, "__bss", 5) == 0
+               || strncmp (sectp->sectname, "__pu_bss", 8) == 0)
+        {
+          sectp->flags = S_REGULAR;
+
+          /* These sections are produced by GCC 4.6+.
+
+             FIXME: We possibly ought to clear uninitialized local
+             variables in statically linked libraries like for
+             SECT_BSS (__bss) above, but setting up the markers we
+             need in lastfile.c would be rather messy. See
+             darwin_output_aligned_bss () in gcc/config/darwin.c for
+             the root of the problem, keeping in mind that the
+             sections are numbered by their alignment in GCC 4.6, but
+             by log2(alignment) in GCC 4.7. */
+
+          if (!unexec_write (sectp->offset, (void *) sectp->addr, sectp->size))
+            unexec_error ("cannot copy section %.16s", sectp->sectname);
+          if (!unexec_write (header_offset, sectp, sizeof (struct section)))
+            unexec_error ("cannot write section %.16s's header", sectp->sectname);
+        }
       else if (strncmp (sectp->sectname, "__la_symbol_ptr", 16) == 0
                || strncmp (sectp->sectname, "__nl_symbol_ptr", 16) == 0
                || strncmp (sectp->sectname, "__got", 16) == 0
@@ -892,6 +913,7 @@ copy_data_segment (struct load_command *lc)
                || strncmp (sectp->sectname, "__program_vars", 16) == 0
                || strncmp (sectp->sectname, "__mod_init_func", 16) == 0
                || strncmp (sectp->sectname, "__mod_term_func", 16) == 0
+               || strncmp (sectp->sectname, "__static_data", 16) == 0
                || strncmp (sectp->sectname, "__objc_", 7) == 0)
         {
           if (!unexec_copy (sectp->offset, old_file_offset, sectp->size))