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Re: libbacktrace patch committed: Trace through shared libraries

Ian Lance Taylor <> writes:

> This patch to libbacktrace adds support for tracing through shared
> libraries.  The libraries are found by calling dl_iterate_phdr, when it
> is available.

Unfortunately, this breaks all Go link tests on Solaris 10:

output is:
Undefined			first referenced
 symbol  			    in file
dl_iterate_phdr                     /var/gcc/gcc-4.8.0-20121010/10-gcc-gas/i386-pc-solaris2.10/./libgo/.libs/
ld: fatal: symbol referencing errors. No output written to /var/gcc/gcc-4.8.0-20121010/10-gcc-gas/gcc/testsuite/go/array-1.x
collect2: error: ld returned 1 exit status

FAIL: go.go-torture/execute/array-1.go compilation,  -O0 

Solaris 10 Update 10 or sufficiently recent linker patches introduced
dl_iterate_phdr on S10 as a backport from Solaris 11, but unlike S11, it
lives in only.  The current dl_iterate_phdr check misses that,
and given that it's only available in the most recent update, it's
probably best to avoid d_i_p on Solaris 10 altogether.


Rainer Orth, Center for Biotechnology, Bielefeld University

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