On 2018-07-16 10:10-0700 Alan W. Irwin wrote:
On 2018-06-09 13:30-0700 Alan W. Irwin wrote:
On 2018-04-15 11:15-0700 Alan W. Irwin wrote:
Hi Jerry:
[...]
So once this Ada build issue appeared again for me yesterday after all
those previous successful hardware checks, I did a google search for
the terms (without the quotes) "gnatmake intermittent build error" and
found
<https://gcc.gnu.org/bugzilla/show_bug.cgi?format=multiple&id=65451>
which was a bug report in 2015 about intermittent Ada build issues
which was immediately fixed back then. However, my gnat version (=
4.9.2) is from 2014 so I don't have that bugfix and I am pretty sure
at this stage that bug 65451 is the issue that is causing the
intermittent Ada build issues for me. Therefore, I plan to use the
-DENABLE_ada=OFF option for my further testing until I can get access
to a later version of the Ada build tools myself, and I suggest others
who currently don't have access to Ada build tools with bug 65451
fixed should do the same.
Just to follow up for Debian Buster with gnat-7 (as opposed to gnat-4 that
I
was using for Debian Jessie) the first test of Ada has been a complete
success.
See commit 994723471 for the details of the tests I ran.
Hi Jerry:
I just ran into this issue for the first time for my new hardware and
latest Ada/gnat (version 7.3.0) from Debian Buster (sigh). I was
doing a parallel build (with -j10 for my new system with 8 real
cores), when the following error was encountered:
./plplot_standard.o: file not recognized: File truncated
collect2: error: ld returned 1 exit status
gnatlink-7: error when calling /usr/bin/gcc-7
gnatmake: *** link failed.
examples/ada/CMakeFiles/xstandard30a.dir/build.make:77: recipe for target
'examples/ada/xstandard30a' failed
make[3]: *** [examples/ada/xstandard30a] Error 4
A google search found
<https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=857831> which
appears to be a similar (or the same bug) for 7.1. At the time, the
Debian packagers thought they had a fix, but it seems from my
experience either that was not true or else the fix has not been
propagated to 7.3. I have just now privately reported the situation to
Matthias Klose (the author of the bug 857831 report, and they guy who
decided that bug was fixed), and we will see what he says. But to
work around this problem until it is fixed for Debian Buster, I plan
to use -DENABLE_ada=OFF for my testing.
To Jerry and Arjen:
On Sunday (just before commit 7ec926fae) I discovered that my installs
of gdc-7 and gnat-7 were probably not good choices because although I
had both gcc-7 and gcc-8 installed, PLplot was being built with gcc-8
rather than gcc-7 on my Debian Buster system. So in this case at
least Debian does not have tight version consistency requirements
between either gdc or gnat and gcc. And perhaps that is justified
since previously I was
getting perfect results with the combination of gdc-7 and gcc-8.
However, the above parallel build issue with gnat-7 encouraged me to try
gnat-8, and
I decided to install gdc-8 as well just to be consistent with gcc-8.
It turns out (see the above commit message for the details) the
combination of gdc-8, gnatmake-8, and gcc-8 produces perfect massively
(-j10) parallel build and test results
for a comprehensive set of of configurations and build trees, and for
three different CMake versions.
So it seems once again that on Linux at least, parallel builds of our
Ada bindings and examples work well, and I advise on other platforms
to avoid gnat-7 in all cases, to use parallel builds with caution, and
at least for the sake of consistency use the same version of gdc,
gnat, and gcc (e.g., gdc-8, gnat-8, and gcc-8).
Alan
__________________________
Alan W. Irwin
Programming affiliations with the FreeEOS equation-of-state
implementation for stellar interiors (freeeos.sf.net); the Time
Ephemerides project (timeephem.sf.net); PLplot scientific plotting
software package (plplot.sf.net); the libLASi project
(unifont.org/lasi); the Loads of Linux Links project (loll.sf.net);
and the Linux Brochure Project (lbproject.sf.net).
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Linux-powered Science
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