WIEN2k-FAQ: Compilation on SUN systems

©2001 by P. Blaha, K. Schwarz and J. Luitz

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Fix: SUN compilation seems to depend a lot on the Compiler version. As far as I heared there are no problems on a Version dated:

Last change: 00/04/03 Sun WorkShop 6

However, I know from some other SUNs that there compiler has several different problems:

• it does not accept the "-free" compiler option
• to overcome this, siteconfig allows you to rename all xx.f files to xx.f90
• On some SUNs you may have to add ".SUFFIXES: .f90"
• On some SUNs severe runtime problems occur. In particular IO-problems (F10.7 does not print 10 places but only nine,....) and a problem with TETRA in lapw2.
• I found that the option -dalign conflicts with any optimization level higher than -O. But note, that the option -dalign is automatically added if you use the -fast option. So, what you need to do is to eliminate -fast option, and to include by hand all options that -fast adds, but without -dalign. Than you can use any optimization level. So, my compiling options now look like: FOPT = -Bstatic -native -O3 -libmil -fsimple=1 -xlibmopt -depend -fns -ftrap=%none -free

So in essence: It seems to be important to have a new Fortran compiler. But even so, runtime problems may/may not occur at specific optimization levels.