Barcode Reader User Manual

Release Enhancements
6-5 Release Notes
The section in which the entry point of a C program is defined cannot be
marked as a conditionally linked section. The compiler marks all function
veneers as conditionally linked.
You must link with the –a linker option, which creates an absolute, execut-
able output module, to enable conditional linking. The –j linker option
disables conditional linking.
For information on the .clink directive, see the Assembler Directives
chapter of the TMS470R1x Assembly Language Tools User’s Guide ; for
information on the –j linker option, see the
Linker Description chapter.
C compiler enhancements
The TMS470R1x optimizing C compiler enhancements are as follows. For
more information, see the named chapter of the
TMS470R1x Optimizing C
Compiler User’s Guide
.
You can specify command line options in a file. When you specify that file
on the command line with the –@ shell option, the compiler reads the file
and interprets it as if it contained part of the command line. For more
information, see the
Compiler Description chapter.
The options that invoke the interlist utility with the shell have changed. The
–s option interlists optimizer comments (if the optimizer is invoked) and
assembly statements; otherwise it interlists C source and assembly state-
ments. The –ss option interlists C source and assembly statements. A new
option, the –os option, interlists optimizer comments with assembly state-
ments. To interlist C source and assembly statements with optimizer
comments, use the –os and –ss options when invoking the optimizer. For
more information, see the
Compiler Description and Optimizing Your
Code
chapters.
Global register variables are now supported. For more information, see
the
TMS470R1x C Language chapter.
Bit-field manipulation improvements are incorporated. For more informa-
tion, see the
Runtime Environment chapter.
The alignment of structures has changed. In previous releases, all struc-
tures were word aligned. Now, a structure is aligned according to the align-
ment of the structure’s most restrictive element. For more information, see
the
Runtime Environment chapter.
Software interrupts are supported for C code. You define the software
interrupt with the SWI_ALIAS pragma. For more information, see the
TMS470R1x C Language and Runtime Environment chapters.