Go to main content
Oracle® Developer Studio 12.6: C++ User's Guide

Exit Print View

Updated: July 2017

2.8 Simplifying Commands

You can simplify complicated compiler commands by defining special shell aliases by using the CCFLAGS environment variable, or by using make.

2.8.1 Using Aliases Within the C Shell

The following example defines an alias for a command with frequently used options.

example% alias CCfx "CC -fast -xnolibmil"

The next example uses the alias CCfx.

example% CCfx any.C

The command CCfx is now the same as the following command:

example% CC -fast -xnolibmil any.C

2.8.2 Using CCFLAGS to Specify Compile Options

You can specify options by setting the CCFLAGS variable.

The CCFLAGS variable can be used explicitly in the command line. The following example shows how to set CCFLAGS (C Shell):

 example% setenv CCFLAGS ’-xO2 -m64’

The next example uses CCFLAGS explicitly.

 example% CC $CCFLAGS any.cc

When you use make, if the CCFLAGS variable is set as in the preceding example and the makefile’s compilation rules are implicit, then invoking make will result in a compilation equivalent to the following command:

CC -xO2 -m64 files...

2.8.3 Using make

The make utility is a very powerful program development tool that you can easily use with all Oracle Developer Studio compilers. See the make(1S) man page for additional information. Using CCFLAGS Within make

When you are using the implicit compilation rules of the makefile (that is, there is no C++ compile line), the make program uses CCFLAGS automatically.