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RealView Assembler User's Guide
Preface Introduction Writing ARM Assembly Language 
Assembler Reference Command syntax 
Obtaining a list of available options Specifying command-line options with an environmen AAPCS Floating-point model CPU names FPU names Memory access attributes Pre-executing a SET directive Splitting long LDMs and STMs Listing output to a file Controlling the output of diagnostic messages Controlling exception table generation Format of source lines Predefined register and coprocessor names Predeclared register names Predeclared extension register names Predeclared coprocessor names Built-in variables and constants Detecting versions of armasm Symbols Symbol naming rules Variables Numeric constants Assembly time substitution of variables Labels Local labels Expressions, literals, and operators String expressions String literals Numeric expressions Numeric literals Floating-point literals Register-relative and program-relative expressions Logical expressions Logical literals Operator precedence Unary operators Binary operators Diagnostic messages Interlocks IT block generation Thumb branch target alignment Using the C preprocessor ARM and Thumb Instructions Directives ReferenceDetecting versions of armasm
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| Home > Assembler Reference > Built-in variables and constants > Detecting versions of armasm | |||
You can use the built-in variable {ARMASM_VERSION} to distinguish between versions of armasm. The format of the version number is PVtbbbb where:
- P
is the major version
- V
is the minor version
- t
is the patch release
- bbbb
is the build number
The ARM assembler did not have the built-in variable |ads$version| before ADS and RVCT. If you have to build versions of your code for legacy development tools, you can test for the built-in variable |ads$version|. Use code similar to the following:
IF :DEF: |ads$version|
; code for RealView or ADS
ELSE
; code for SDT
ENDIF
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