Exactly which compiler is "f77"? It is very likely that your Fortran code will not be recognized by a Fortran 77 compiler.
ifort does not have an -O4 level. It does have -O3. However, optimization levels are not directly comparable across different compilers, so you'll have to look at the documentation for the other compiler to see what is appropriate.
-Bstatic affects linking and says to link with static libraries.
I don't recognize -dn
Sun fits the description...
http://www.atnf.csiro.au/computing/software/sol2docs/mr/READMEs/fortran_77.html(...)
Linking on SPARC V9 Platforms Under Solaris 7 and 8:
Many static system libraries, such as
libm.a and
libc.a, are not available in Solaris 7 or 8 environments on SPARC V9 platforms. Only dynamic, shared libraries,
libm.so and
libc.so, are provided. This means that
-Bstatic and
-dn compiler options may cause linking errors on SPARC V9 platforms with Solaris 7 or 8. Applications must use dynamic libraries in these cases.
To explicitly link with a static version of a user library while linking dynamically system libraries, use a command line that looks something like:
f77 -o prog prog.f -Bstatic -lxyz -labc -Bdynamic
This will link with libxyz.a and libabc.a, but all other libraries, including system libraries, will be linked dynamically.
(...)
