[Scilab-Dev] 64-bit build oddness

[Crispin Boylan]

hi

i wonder if anyone can help me with some build weirdness i'm 
experiencing.  Any help appreciated as it has me totally stumped.

On openmandriva I can build i586 fine, no problems all tests pass. On 
x86_64 i'm seeing odd behaviour:

1. looks like some sort of corruption in the 'debug' output:

  setgetmode  ¦q¦  d   ¦¦         -1     307
  stackg  ¦4¦%  7¦  ¦4¦%        -4

I know on windows for example this does not happen.  However I can also 
see this on the prebuilt binaries for x86_64 so I'm wondering if this is 
just a linux thing.

2. make doc fails with an 'invalid index error' ( i raised bug 14088 
about this).

I finally tracked this down to:

a=[]
a($)

giving an invalid index.  It seems this was working on 5.3.3 but only 
because the extra checks on empty lists in matext1/2 between 5.5.0-beta1 
and 5.5.0 were not there.

This part of the code is producing the error:

          if(
      &     stk(sadr(il1+4)).le.0.and.
      &     abs(istk(il1)).ne.4.or.
      &   (abs(istk(il1)).ne.1.and.
      &   abs(istk(il1)).ne.2.and.
      &   abs(istk(il1)).ne.4.and.
      &   abs(istk(il1)).ne.129)) then
             call error(21)
             return
          endif


so for some reason stk(sadr(il1+4)) is giving a negative number for 
a($).  If I add the type check for 2 and 129 to the first part of the 
expression it succeeds.


3. IEEEcompatibility test fails.

This is due to number_properties('denorm') returning F.  I've tried 
fiddling with the build properties of lapack to remove optimisation etc 
without success.


So i'm thinking overall there's something odd about this build, but I 
cant for the life of me think what.  Some things i've tried:

Using a different kernel
Freshly built gcc 5.2.0 with no patches
Updating a gcc
Rebuilding lapack (3.5) with various options removed
Rebuilding glibc with most of our patches and optimisation levels removed
Rebuilding scilab with no optimisation

The fact that this happens on both our platforms (2014.2 has gcc 
4.8/glibc 2.19 and dev has gcc 5.2/glibc 2.22) is odd...

Any suggestions?

thanks
cris.