HP aC++/HP C Programmer's Guide (B3901-90036; A.06.26; September 2011)

• “Standards Related Options” (page 100)
• “Subprocesses of the Compiler” (page 105)
• “Symbol Binding Options” (page 107)
• “Template Options” (page 110)
• “Trigraph Processing Suppression Option” (page 112)
• “Verbose Compile and Link Information” (page 113)
• “Concatenating Options” (page 115)
Options to Control Code Generation
The following options allow you to control the kind of code that the compiler generates:
• -c
• +DOosname
• +DDdata_model
• +DSmodel
• -S
-c
You can use the -c option to compile one or more source files without entering the linking
phase.
When compiled, the compiler produces an object file (a file ending with .o) for each
source file (a file ending with .c, .C, .s, or .i). Note that you must link object files
before they can be executed.
Example:
aCC -c sub.C prog.C
In this example, the compiler compiles sub.C and prog.C and puts the relocatable
object code in the files, sub.o and prog.o, respectively.
+DOosname
The +DOosname option sets the target operating system for the compiler, and is intended
for enabling optimizations that are not backward compatible.
For instance, the 11.23 compiler introduces new optimized math library functions that
require library support not available in prior operating systems. +DO can be used at any
level of optimization. The default value for osname is the operating system version on
which the compiler is invoked.
The syntax for this option is +DOosname, where osname is either 11.20, 11.22 or
11.23.
Options to Control Code Generation 35