Include files

System includes /usr/include /usr/include/sys

Use -I path_to_file when include file isn't in the current or system includes directory

Example cc -I /usr/local/lib/pgplot/ file.c

Libraries

System libraries in /usr/lib and /lib

Use -L path_to_file when library isn't in the current or system libraries directories

Example: there are 2 ways to reference the library /usr/local/lib/pgplot/libpgplot.a

f77 -L/usr/local/libpgplot -lpgplot -o myfile myfile.o

f77 -o myfile myfile.o /usr/local/lib/pgplot/libpgplot.a

Some of the Most Often Used Compiling Options

• -c: compile the source but don't link it
• -g: includes symbol table for debugging
• -I directory: look for include files in this directory in addition to /usr/include
• -L directory: look for libraries in this directory in adddition to /usr/lib
• -O#: optimize the code (-O3 most aggressive)
• -o file : place output in file (default is a.out)
• -static: cause local variables to be statically allocated, initialized to 0 (used in legacy codes)