RealView Compilation Tools Compiler Reference Guide - ARM ...

Compiler Command-line Options
--apcs=/rwpi --no_lower_rwpi --via=L_apcs.txt
and a second via file L_apcs.txt containing the line:
-L--rwpi -L--callgraph
compiling main.c with the command line:
armcc main.c -L-o”main.axf" --via=apcs.txt
compiles main.c using the command line:
armcc --no_lower_rwpi --apcs=/rwpi -L--rwpi -L--callgraph -L-o"main.axf" main.c
See also
• Appendix A Via File Syntax
• Reading compiler options from a file on page 2-10 in the Compiler User Guide.
2.1.123 --[no_]vla
This option enables or disables support for variable length arrays.
Default
C90 and Standard C++ do not support variable length arrays by default. Select the
option --vla to enable support for variable length arrays in C90 or Standard C++.
Variable length arrays are supported both in Standard C and the GNU compiler
extensions. The option --vla is implicitly selected either when the source language is
C99 or the option --gnu is specified.
Example
size_t arr_size(int n)
{
char array[n];
// variable length array, dynamically allocated
}
return sizeof array;
// evaluated at runtime
See also
• --c90 on page 2-13
• --c99 on page 2-13
• --cpp on page 2-14
• --gnu on page 2-44.
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