[Bug ld/15126] [REGRESSION] 2.23.51.0.9 fails to link cairo with libstdc++ (could not read symbols: Invalid operation)

[vapier at gentoo dot org]

http://sourceware.org/bugzilla/show_bug.cgi?id=15126

--- Comment #16 from Mike Frysinger <vapier at gentoo dot org> 2013-02-20 
21:24:04 UTC ---
i've verified that 2.23.51.0.8 works and 2.23.51.0.9 fails (the use case i
posted involving webkit-gtk).  both done using Gentoo ebuilds, but sans Gentoo
patches (i.e. USE=vanilla).  i can show the configure lines, but i don't think
those are relevant -- it uses shared libs and a normal x86_64-pc-linux-gnu
target.

these tests were done using ld.bfd.  ld.gold (both .8 and .9) is able to work.

that said, in the webkit example, the code is apparently missing an -lrt.  so
maybe the .8 version is papering over the bug, and while .9 causes things to
not link, it's not a bug with .9.  ignoring, of course, that "invalid
operation" message which is wrong either way.

$ readelf -s
Source/WebKit2/Platform/unix/Programs_WebKitPluginProcess-SharedMemoryUnix.o |
grep shm_unlink
   65: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND shm_unlink
$ ./doit.sh
...
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.2/../../../../x86_64-pc-linux-gnu/bin/ld:
Source/WebKit2/Platform/unix/Programs_WebKitPluginProcess-SharedMemoryUnix.o:
undefined reference to symbol 'shm_unlink@@GLIBC_2.2.5'
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.2/../../../../x86_64-pc-linux-gnu/bin/ld:
note: 'shm_unlink@@GLIBC_2.2.5' is defined in DSO /lib64/librt.so.1 so try
adding it to the linker command line
/lib64/librt.so.1: could not read symbols: Invalid operation
collect2: error: ld returned 1 exit status
$ ./doit.sh -lrt
<works>
$ readelf -s Programs/.libs/WebKitPluginProcess | grep shm_unlink
  716: 0000000000000000 0 FUNC GLOBAL DEFAULT UND address@hidden (9)
 4389: 0000000000000000 0 FUNC GLOBAL DEFAULT UND shm_unlink@@GLIBC_2.2.5

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