[Bug fortran/22519] Memory and binary disk layout disagree for real*10

[schnetter at uni-tuebingen dot de]

------- Additional Comments From schnetter at uni-tuebingen dot de  2005-07-17 20:01 -------
My argument -- which I had in my head, but didn't put down -- went as follows: 
ultimately, things have to be written by a system call, and a system call is 
expensive.  (One system call per array element is out of the question.)  Thus 
we either dump the whole array to disk, byte for byte as it is in memory, or 
we have to transform it into a temporary buffer and then write this buffer.  
C's fwrite uses a buffer (probably), fprintf does for sure. 
 
If you remove the padding, then you have to allocate and deallocate these 
buffers and pack or unpack the array elements explicitly.  Depending on your 
I/O library, that may be a lot of work.  And in the end you are still 
incompatibly to C. 
 
(I'm afraid we may be going to repeat a discussion here that was already held 
on the mailing list.) 
 

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22519