ARM Compiler toolchain v4.1 for µVision Using the Compiler

Getting started with the Compiler
3.5 Using stdin to input source code to the compiler
Instead of creating a file for your source code, you can use stdin to input source code directly
on the command line. This is useful if you want to test a short piece of code without having to
create a file for it.
To use stdin to input source code directly on the command line:
1. Invoke the compiler with the command-line options you want to use. The default compiler
mode is C. Use the minus character (-) as the source filename to instruct the compiler to
take input from stdin. For example:
armcc --bigend -c -
If you want an object file to be written, use the -o option. If you want preprocessor output
to be sent to the output stream, use the -E option. If you want the output to be sent to
stdout, use the -o- option. If you want an assembly listing of the keyboard input to be sent
to the output stream after input has been terminated, use none of these options.
2. You cannot input on the same line after the minus character. You must press the return key
if you have not already done so.
The command prompt waits for you to enter more input.
3. Enter your input. For example:
#include
int main(void)
{ printf("Hello world\n"); }
4. Terminate your input by entering Ctrl-Z then Return.
An assembly listing for the keyboard input is sent to the output stream after input has been
terminated if both the following are true:
• no output file is specified
• no preprocessor-only option is specified, for example -E.
Otherwise, an object file is created or preprocessor output is sent to the standard output stream,
depending on whether you used the -o option or the -E option.
The compiler accepts source code from the standard input stream in combination with other
files, when performing a link step. For example, the following are permitted:
• armcc -o output.axf - object.o mylibrary.a
• armcc -o output.axf --c90 source.c -
Executing the following command compiles the source code you provide on standard input, and
links it into test.axf:
armcc -o test.axf -
You can only combine standard input with other source files when you are linking code. If you
attempt to combine standard input with other source files when not linking, the compiler
generates an error.
3.5.1 See also
Tasks
Introducing the ARM Compiler toolchain:
• Using a text file to specify command-line options on page 2-20.
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