On 2013-02-14 15:04, [email protected] wrote:
Od: "Konstantin Belousov" <[email protected]>
On Wed, Feb 13, 2013 at 12:13:58PM -0500, Ryan Stone wrote:
On Wed, Feb 13, 2013 at 11:18 AM, <[email protected]> wrote:
...
Machine in question runs amd64 FreeBSD 9.1-RC2, but this has also
...
You did not specified anything about version of the FreeBSD used, nor
the exact compiler invocations. Using the crystal ball, I see the
r244600 for HEAD and r244904 for stable/9, if you use --gc-sections
flags. This is more or less consistent with what you reported, since
gcc from ports uses binutils from ports, which have newer ld with
bugfix already applied.
...
In my case it is indeed so that while the gcc42 generated binary does not
contain the note, gcc47 binary does contain it. I am indeed using --gc-sections
linker option, however whether this, potentially with some bug in linker,
caused the note to be missing, I am not sure, as I did not investigate into
this. The solution of the original problem is thus to ensure that the note
presence is consistent and that the correct signal is handled.
As Kostik already pointed out, FreeBSD's ld contains a bug which
erroneously strips out the note sections, if you use --gc-sections.
I fixed that for head in r244600, and merged it to stable/9 in r244904.
Since you said you are running FreeBSD 9.1-RC2, you will not have this
particular fix, so it is the most likely cause for your problems.
The reason you do not see it with gcc 4.7 is that it will use a much
newer ld from the binutils port, where this issue with --gc-sections
was fixed a long time ago.
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