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Bug#698007: marked as done (mklibs: Fix undefined reference to __dso_handle problem encountered with librt.so)

Your message dated Sat, 1 Mar 2014 20:23:40 +0100
with message-id <20140301192340.GG28054@mraw.org>
and subject line Re: Bug#698007: mklibs: Fix undefined reference to __dso_handle problem encountered with librt.so
has caused the Debian Bug report #698007,
regarding mklibs: Fix undefined reference to __dso_handle problem encountered with librt.so
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

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698007: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=698007
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--- Begin Message --- 
Package: mklibs
Tags: patch

----- Forwarded message from Joe Seymour <jseymour@codesourcery.com> -----

Date: Sat, 12 Jan 2013 13:13:56 +0000
From: Joe Seymour <jseymour@codesourcery.com>
To: debian-boot@lists.debian.org
Subject: [PATCH] Fix undefined reference to __dso_handle problem encountered with librt.so
X-Mailing-List: <debian-boot@lists.debian.org> archive/latest/170862
X-CRM114-Status: Good  ( pR: 18.8078 )

[Please CC me on any responses]

When using mklibs on a simple test application I encountered the following error
when mklibs attempts to build a reduced librt.so:

/usr/lib64/libpthread_nonshared.a(pthread_atfork.oS): relocation R_X86_64_PC32
against undefined hidden symbol `__dso_handle' can not be used when making a
shared object
ld: final link failed: Bad value

Examining the link map for librt.so, when built by EGLIBC, I see the
__dso_handle definition used by it comes from crtbeginS.o, which isn't included
in the link because mklibs passes -nostartfiles.

In order to create a reduced librt.so that as closely as possible resembles the
original, it makes sense to include crtbeginS.o when dealing with librt.so.1.
This patch does that. crtendS.o is included as a requisite of crtbeginS.o.

Joe

diff --git a/src/mklibs b/src/mklibs
index 14ca02a..0b62136 100755
--- a/src/mklibs
+++ b/src/mklibs
@@ -617,6 +617,17 @@ while 1:
                 extra_post_obj.append(sysroot + libc_extras_dir + "/sofini.o")
                 symbols.add(ProvidedSymbol('__dso_handle', None, None, True))

+            if soname in ("librt.so.1"):
+                crtbegin = command(target + "gcc",
+                                   " ".join(gcc_options),
+                                   "-print-file-name=crtbeginS.o");
+                crtend = command(target + "gcc",
+                                 " ".join(gcc_options),
+                                 "-print-file-name=crtendS.o");
+                extra_pre_obj.append(" ".join(crtbegin))
+                extra_post_obj.append(" ".join(crtend))
+                symbols.add(ProvidedSymbol('__dso_handle', None, None, True))
+
             map_file = find_pic_map(library)
             if map_file:
                 extra_flags.append("-Wl,--version-script=" + map_file)


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--- Begin Message --- 
Cyril Brulebois <kibi@debian.org> (2014-03-01):
> If you're still having any issues with it, it would be nice to describe
> a complete test case.

jseymour@codesourcery.com                                 
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So closing…

Mraw,
KiBi.

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