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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: About static libraries and Debian policy
Date: Sun, 16 May 2010 11:13:47 +0100
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Date: 2010-05-16T11:13:47+01:00
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Ludovic Brenta <ludovic@ludovic-brenta.org> writes:

> Simon Wright writes on comp.lang.ada:
>> Ludovic Brenta <ludovic@ludovic-brenta.org> writes:
>>
>>> That's because GNAT GPL includes a non-standard 'libaddr2line.a'
>>> produced from binutils (and therefore pure GPL) and calls that to
>>> produce the symbolic tracebacks.  GCC (from the FSF) lacks this
>>> library.  I patched GCC to use an alternate mechanism instead,
>>> i.e. fork()/exec() and call /usr/bin/addr2line.  This restores the
>>> functionality in the FSF version of GNAT.
>>
>> Ludovic, could you point me towards the patch for this? On Mac OS X, we
>> don't have addr2line, the equivalent is atos.
>
> Latest version:
> http://green.ada-france.org:8081/revision/file/adfe332edf9057b6de622519fd9161421c5c9c76/debian/patches/ada-symbolic-tracebacks.diff
>
> HTH

Thanks for that, I'm sure it'll help. As an alternative, could use one
of the GNAT.OS_Lib.Spawn calls?

I notice that towards the end the comment says

+      --  version dependant variants for the option names. Therefore our
+      --  implementation spawns a shell script that does normalization of
+      --  the option and then executes addr2line and communicates with it
+      --  through a bidirectional pipe.

but it looks to me as though it spawns addr2line drectly?

+          char *const argv[] = { "addr2line",
+                                 exe_name,
+                                 "--demangle=gnat",
+                                 "--functions",
+                                 "--basenames",
+                                 NULL };
+          char *const envp[] = { NULL };
+          if (execve("/usr/bin/addr2line", argv, envp) < 0) {
+            CLOSE1; CLOSE2;
+          }