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Overview of the Assembler Overview of the ARM Architecture Structure of Assembly Language Modules Writing ARM Assembly Language Condition Codes 
Using the Assembler Assembler command line syntax Assembler commands listed in groups Specify command line options with an environment v Using stdin to input source code to the assembler Built-in variables and constants Versions of armasm Diagnostic messages Interlocks diagnostics IT block generation Thumb branch target alignment Thumb code size diagnostics ARM and Thumb instruction portability diagnostics Instruction width 2 pass assembler diagnostics Using the C preprocessor Address alignment Instruction width selection in Thumb Symbols, Literals, Expressions, and Operators VFP ProgrammingUsing the C preprocessor
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| Home > Using the Assembler > Using the C preprocessor | |||
You can use C preprocessor commands in your assembly language source file. If you do this, you must use the --cpreproc command line option when invoking the assembler. This causes armasm to call armcc to preprocess the file before assembling it.
armasm looks for the armcc binary in the same directory as the armasm binary. If it does not find the binary, it expects it to be on the PATH.
armasm passes certain options to armcc if present on the command line. These are shown in Table 23. Some of these options are converted to the armcc equivalent before passing to armcc. These are shown in Table 24.
Table 23. Command-line options
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| --diag_warning | --li |
To pass other simple compiler options, such as the preprocessor option -D, you must use the --cpreproc_opts command line option. armasm correctly interprets the preprocessed #line commands. It can generate error messages and debug_line tables using the information in the #line commands.
Example 22 shows the commands you write to preprocess and assemble a file, source.s. The example also passes the compiler options to define a macro called RELEASE, and to undefine a macro called ALPHA.
Example 22. Preprocessing an assembly language source file
armasm --cpreproc --cpreproc_opts=-D,RELEASE,-U,ALPHA source.s
If you want to use complex preprocessor options, you must manually call armcc to preprocess the file before calling armasm. Example 23 shows the commands you write to manually preprocess and assemble a file, source.s. In this example, the preprocessor outputs a file called preprocessed.s, and armasm assembles preprocessed.s.
Example 23. Preprocessing an assembly language source file manually
armcc -E source.s > preprocessed.s armasm preprocessed.s
See also- Concepts
Using the Compiler:
- Reference
Assembler Reference:
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