The ARM assembler is a two pass assembler and the input code
that the assembler reads must be identical in both passes. If a
symbol is defined after the
:DEF: test for that symbol,
then the code read in pass 1 might be different from the code read
in pass 2. The assembler can warn in this situation.
To do this, use the following command-line option when invoking the assembler:
armasm --diag_warning 1907
Example 21 shows that
the symbol foo is defined after the
:DEF: foo test.
Assembling this code with
--diag_warning 1907 generates
Warning A1907W: Test for this symbol has been seen and may cause failure in the second pass.