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erroneous "non-constant expression" error

From: Zefram
Subject: erroneous "non-constant expression" error
Date: Thu, 23 Jun 2005 21:37:00 +0100

$ uname -a
Linux treache.rous.org 2.4.19-686 #1 Mon Nov 18 23:59:03 EST 2002 i686 GNU/Linux
$ as --version
GNU assembler 2.15
Copyright 2002 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License.  This program has absolutely no warranty.
This assembler was configured for a target of `i386-linux'.
$ dpkg -l binutils
| Status=Not/Installed/Config-files/Unpacked/Failed-config/Half-installed
|/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err: uppercase=bad)
||/ Name           Version        Description
ii  binutils       2.15-6         The GNU assembler, linker and binary utiliti
$ md5sum t.s   # t.s is included as an attachment to this message
812b0e954fb19ac7f460f570cbdd85bd  t.s
$ as t.s
t.s: Assembler messages:
t.s:55: Error: non-constant expression in ".if" statement

The expression in the .if is most definitely constant, and the assembler
had no problem with 43 preceding similar expressions.  This bug is
sensitive to the precise sequence of macro calls: changing the order or
adding or removing calls can make the error message occur on a different
line -- possibly several lines -- or not occur at all.  My real code has
about 450 of these macro calls (it's building a string table), and each
time I change it there's about 50% chance that this problem will occur.


Attachment: t.s
Description: Text document

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