output file problems on powerpc with new installation of gcc/gfortran

[Jerry DeLisle]

Stefanos Folias wrote:
> Hi,
> 
> I am not sure what information to include, so if advised I'll do my best 
> to provide it.
> 
> I have been running many previous versions of gfortran without any 
> problems. It's been some time since i have updated and I just installed 
> the latest gcc from http://hpc.sourceforge.net/ for PowerPC.  I am 
> running OS X 10.4.9.
> 
> 
> When I run my code that generates an unformatted output file of a matrix 
> and I load it into Matlab, the data is wildly ranging over hundreds of 
> orders of magnitude, i.e., the data file is no longer being interpreted 
> in the same way as it had before the installation.
> 
> I am not sure where to start to understand what the problem is.  Any 
> advice would be helpful.
> 
First, show us the output from the command:  gfortran -v so we can confirm the 
version number and build information.

Gfortran did undergo some changes from 64-bit record markers to 32-bit record 
markers several months ago and is now compatible with Intel format.  The 64-bit 
record markers can be re-enabled with -frecord-marker=8.

 From the manual:

-frecord-marker=length
     Specify the length of record markers for unformatted files. Valid values 
for length are 4 and 8. Default is 4. This is different from previous versions 
of gfortran, which specified a default record marker length of 8 on most 
systems. If you want to read or write files compatible with earlier versions of 
gfortran, use -frecord-marker=8.

I don't know if this is your problem, but you could try this and see if it helps.

Jerry