MPLAB C Compiler for PIC24 MCUs and dsPIC DSCs ... - Microchip

16-Bit C Compiler User’s Guide
3.5.10 Options for Directory Search
The following options specify to the compiler where to find directories and files to
search.
TABLE 3-14: DIRECTORY SEARCH OPTIONS
Option Definition
-Bprefix This option specifies where to find the executables, libraries,
include files and data files of the compiler itself.
The compiler driver program runs one or more of the
sub-programs pic30-cpp, pic30-cc1, pic30-as and
pic30-ld. It tries prefix as a prefix for each program it tries to
run.
For each sub-program to be run, the compiler driver first tries the
-B prefix, if any. If the sub-program is not found, or if -B was not
specified, the driver uses the value held in the
PIC30_EXEC_PREFIX environment variable, if set. See
Section 3.6 “Environment Variables”, for more information.
Lastly, the driver will search the current PATH environment
variable for the subprogram.
-B prefixes that effectively specify directory names also apply to
libraries in the linker, because the compiler translates these
options into -L options for the linker. They also apply to include
files in the preprocessor, because the compiler translates these
options into -isystem options for the preprocessor. In this case,
the compiler appends include to the prefix. Another way to
specify a prefix much like the -B prefix is to use the environment
variable PIC30_EXEC_PREFIX.
-specs=file Process file after the compiler reads in the standard specs file, in
order to override the defaults that the pic30-gcc driver program
uses when determining what switches to pass to pic30-cc1,
pic30-as, pic30-ld, etc. More than one -specs=file can be
specified on the command line, and they are processed in order,
from left to right.
3.5.11 Options for Code Generation Conventions
Options of the form -fflag specify machine-independent flags. Most flags have both
positive and negative forms; the negative form of -ffoo would be -fno-foo. In the
table below, only one of the forms is listed (the one that is not the default.)
TABLE 3-15: CODE GENERATION CONVENTION OPTIONS
Option Definition
-fargument-alias
-fargument-noalias
-fargumentnoalias-global
Specify the possible relationships among parameters and between
parameters and global data.
-fargument-alias specifies that arguments (parameters) may
alias each other and may alias global storage.
-fargument-noalias specifies that arguments do not alias
each other, but may alias global storage.
-fargument-noalias-global specifies that arguments do not
alias each other and do not alias global storage.
Each language will automatically use whatever option is required
by the language standard. You should not need to use these
options yourself.
DS51284H-page 56 © 2008 Microchip Technology Inc.