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

16-Bit C Compiler User’s Guide
TABLE 3-2: dsPIC ® DSC DEVICE-SPECIFIC OPTIONS (CONTINUED)
Option Definition
-mno-isr-warn By default the compiler will produce a warning if the __interrupt__
is not attached to a recognized interrupt vector name. This option will
disable that feature.
-momf=omf Selects the OMF (Object Module Format) to be used by the compiler.
The omf specifier can be one of the following:
coff Produce COFF object files. (This is the default.)
elf Produce ELF object files.
The debugging format used for ELF object files is DWARF 2.0.
-msmall-code Compile using the small code model. Called functions are assumed to
be proximate (within 32 Kwords of the caller). (This is the default.)
-msmall-data Compile using the small data model. All static and external variables
are assumed to be located in the lower 8 KB of data memory space.
(This is the default.)
-msmall-scalar Like -msmall-data, except that only static and external scalars are
assumed to be in the lower 8 KB of data memory space. (This is the
default.)
-mtext=name Specifying -mtext=name will cause text (program code) to be placed
in a section named name rather than the default .text section. No
white spaces should appear around the =.
-msmart-io
[=0|1|2]
This option attempts to statically analyze format strings passed to
printf, scanf and the ‘f’ and ‘v’ variations of these functions. Uses of
nonfloating point format arguments will be converted to use an
integer-only variation of the library functions.
-msmart-io=0 disables this option, while -msmart-io=2 causes the
compiler to be optimistic and convert function calls with variable or
unknown format arguments. -msmart-io=1 is the default and will
only convert the literal values it can prove.
Note 1: The procedure abstractor behaves as the inverse of inlining functions. The pass is
designed to extract common code sequences from multiple sites throughout a
translation unit and place them into a common area of code. Although this option
generally does not improve the run-time performance of the generated code, it can
reduce the code size significantly. Programs compiled with -mpa can be harder to
debug; it is not recommended that this option be used while debugging using the
COFF object format.
The procedure abstractor is invoked as a separate phase of compilation, after the
production of an assembly file. This phase does not optimize across translation
units. When the procedure-optimizing phase is enabled, inline assembly code must
be limited to valid machine instructions. Invalid machine instructions or instruction
sequences, or assembler directives (sectioning directives, macros, include files,
etc.) must not be used, or the procedure abstraction phase will fail, inhibiting the
creation of an output file.
DS51284H-page 36 © 2008 Microchip Technology Inc.