• edit source files: .f, .for, .f90, .f95, ...;
• compile each source file to produce an object file: .o;
• link object files to produce an executable file --- static or dynamic linking.

• We return to this subject (in the context of Makefiles) later.

Examples --- Cosmos, Sun F90 Compiler

  Either:
      use the 4.2 compiler, 
  or
      use 5.0 or 6.0 compiler with "-lF77"

  f90 -c quadratic.f90
  f90 -o quad quadratic.o

  f90 -o quad quadratic.f90

Static Linking:

Here the NAg library is statically-linked (.a) in:

  f90 -o nag_ex nag_example.f90 -lnag 

• -lnag statically links with libnag.a;
• there are still dynamic dependencies (use ldd to see this);

  f90 -Bstatic -o nag_ex nag_example.f90 -lnag 

Dynamic Linking

    f90 -o quad quadratic.o /software/nag/naglib_f77_mark19/libnag.so.19 

Dynamic vs Static Linking

• dynamically-linked executables are smaller;
• statically-linked executables may load faster and are more portable.