error when the -malign-double flag is included in a Makefile

[Jerry DeLisle]

jdelia@intec.unl.edu.ar wrote:
> Hi gfortran developers,
> 
> I found a running crash with a rather big code and the following codes 
> included in the "error.tgz" file is a reduced version.
> 
>  From some further tests I found that the runnig crash is caused by the 
> "-malign-double" flag only when it is used in a Makefile.
> 
> On the other hand, when each module and main program are compiled by 
> turn and linked manualy, there is not any crashing.
> 
> Please, how can I do to fix this?
> 

The -malign-double is known to break ABI and it is recommended that you not use 
this flag.

If you are running on a 64 bit architecture, it buys you nothing in performance.

The gfortran library is not compiled with it, so if you compile a routine or 
program that contains calls to the library, in particular, the I/O routines, 
your calls will not align correctly with the library functions and you will get 
failures.

If you insist that you need -malign-double, then you must put all your programs 
I/O in separate routines and compile those without -malign-double.  Then you can 
compile compute only routines with -malign-double and things may then work.  I 
can't guarantee that though.

Regards,

Jerry