Re: [PATCH v2 5/5] T360-symbol-hiding: Use nm instead of objdump.

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+From: David Bremner <david@tethera.net>\r
+To: Charles Celerier <cceleri@cs.stanford.edu>, Notmuch Mail\r
+       <notmuch@notmuchmail.org>\r
+Subject: Re: [PATCH v2 5/5] T360-symbol-hiding: Use nm instead of objdump.\r
+In-Reply-To: <m24n0xy974.fsf@jane.lan>\r
+References: <1399395748-44920-1-git-send-email-cceleri@cs.stanford.edu>\r
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+Date: Sat, 12 Jul 2014 16:00:14 -0300\r
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+Charles Celerier <cceleri@cs.stanford.edu> writes:\r
+\r
+> David Bremner <david@tethera.net> writes:\r
+>\r
+>     $ objdump -t lib/*.o | sed -n '/\[\.text\] __\?notmuch/p' | tail\r
+>     00000000000009a0 g       0f SECT   01 0000 [.text] _notmuch_thread_get_authors\r
+>     0000000000000990 g       0f SECT   01 0000 [.text] _notmuch_thread_get_matched_messages\r
+>     0000000000000960 g       0f SECT   01 0000 [.text] _notmuch_thread_get_messages\r
+>     00000000000009d0 g       0f SECT   01 0000 [.text] _notmuch_thread_get_newest_date\r
+\r
+Here is some equivalent output from Linux\r
+\r
+$ objdump -t lib/*.o | sed -n '/[.]text.*notmuch/p' | tail -12\r
+\r
+0000000000000150 g     F .text 000000000000095e .hidden _notmuch_thread_create\r
+0000000000000ab0 g     F .text 0000000000000009 notmuch_thread_get_toplevel_messages\r
+0000000000000ac0 g     F .text 0000000000000009 notmuch_thread_get_messages\r
+\r
+...\r
+\r
+Notice in particular the ".hidden" in the first line. Also, the lack of\r
+extra _ on the front.  \r
+\r
+It may be that the visibility information is not accessible on OS-X\r
+using objdump; this is something different than whether a symbol is\r
+extern. The symbols marked .hidden can be used across compilation unit\r
+boundaries, but will not be exported from the shared library.\r
+\r