[LLVMdev] [3.7 Release] RC1 has been tagged, Testing Phase I begins

[Dimitry Andric]

On 19 Jul 2015, at 17:32, Dimitry Andric <dimitry at andric.com> wrote:
> 
> On 19 Jul 2015, at 01:44, Dimitry Andric <dimitry at andric.com> wrote:
> ...
>> Hm, strangely enough, this version of the script does not go further than the Phase 2 installation, and does not run any tests?  This used to work fine for the release_36 branch.
>> 
>> I think it is because of the "set -o pipefail" which was introduced, but I don't yet understand why this causes the Phase 2 installation to appear to fail, as there is no visible error.  I will investigate, or work around it by removing the pipefail option again.
> 
> It appears to be caused by the clean_RPATH() function, which has this line:
> 
>      rpath=`objdump -x $Candidate | grep 'RPATH' | sed -e's/^ *RPATH *//'`
> 
> If the objdump'd file does not have any RPATH, the whole statement will fail, since set -o pipefail is in effect.  This terminates the script, since set -e is also in effect.
> 
> The line can be replaced with this instead:
> 
>      rpath=`objdump -x $Candidate | sed -ne'/RPATH/{s/^ *RPATH *//;p;}'`

Another new problem with the test-release.sh script is that it can cause the whole machine (!) to run out of memory, when comparing phase 2 with phase 3, due to the following fragment:

   470          echo "# Comparing Phase 2 and Phase 3 files"
   471          for p2 in `find $llvmCore_phase2_objdir -name '*.o'` ; do
   472              p3=`echo $p2 | sed -e 's,Phase2,Phase3,'`
   473              # Substitute 'Phase2' for 'Phase3' in the Phase 2 object file in
   474              # case there are build paths in the debug info. On some systems,
   475              # sed adds a newline to the output, so pass $p3 through sed too.
   476              if ! cmp --ignore-initial=16 <(sed -e 's,Phase2,Phase3,g' $p2) \
   477                      <(sed -e '' $p3) > /dev/null 2>&1 ; then
   478                  echo "file `basename $p2` differs between phase 2 and phase 3"
   479              fi
   480          done

Because cmp(1) on FreeBSD does not support the --ignore-initial option, which is a GNU extension, the command immediately fails.  Then, the <(...) constructs on lines 476 and 477 spawn two new bash instances per iteration, and these never get cleaned up, at least not on FreeBSD.  This may very well be a bash bug.

Alternatively, the 'skip' values can be specified as the third and fourth argument on the cmp(1) command line, and this works on both Linux, FreeBSD and OSX; e.g. this:

            if ! cmp -s <(sed -e 's,Phase2,Phase3,g' $p2) <(sed -e '' $p3) \
                    16 16 ; then

I think this is the final adjustment I have to make to get the building and testing to complete.  Hans, is it OK if I commit these changes to test-release.sh in trunk?  Then I'll merge them to release_37 afterwards.

-Dimitry
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