[Bug gas/22714] New: Two files, one containing one more character in a comment, one is translated, the other not

[weo at reccoware dot de]

https://sourceware.org/bugzilla/show_bug.cgi?id=22714

            Bug ID: 22714
           Summary: Two files, one containing one more character in a
                    comment, one is translated, the other not
           Product: binutils
           Version: 2.29
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gas
          Assignee: unassigned at sourceware dot org
          Reporter: weo at reccoware dot de
  Target Milestone: ---

Created attachment 10750
  --> https://sourceware.org/bugzilla/attachment.cgi?id=10750&action=edit
This archive contains the sample files demonstrating the problem

OS: Fedora 27, all updates

arm-linux-gnueabi-as, version 2.29.1, build from sources

$ arm-linux-gnueabi-as -version
GNU assembler (GNU Binutils) 2.29.1
Copyright (C) 2017 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License version 3 or later.
This program has absolutely no warranty.
This assembler was configured for a target of `arm-linux-gnueabi'.

The attached file "entry-armv-okay-1. s" can be translated, the file
"entry-armv-fail-1. s" cannot. The error message is:

/home/user/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/kernel/linux/arch/arm/kernel/entry-header.S:
Assembler messages:
/home/user/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/kernel/linux/arch/arm/kernel/entry-header.S:319:
Warning: stray `\'
/home/user/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/kernel/linux/arch/arm/kernel/entry-armv.S:773:
Warning: stray `\'
/home/user/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/kernel/linux/arch/arm/kernel/entry-armv.S:773:
Error: bad expression

Command line:

arm-linux-gnueabi-as entry-armv-fail-1.s

The files differ in this way:

--- entry-armv-okay-1.s 2018-01-15 17:03:30.339301143 +0100
+++ entry-armv-fail-1.s 2018-01-15 17:00:43.578260650 +0100
@@ -7,7 +7,7 @@


 # 1 "./include/generated/autoconf.h" 1
-# 16
"/home/user/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/kernel/linux/include/linux/kconfig.h"
2
+# 6
"/home/user/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/kernel/linux/include/linux/kconfig.h"
2
 # 1 "<command-line>" 2
 # 1
"/home/user/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/kernel/linux/arch/arm/include/asm/unified.h"
1
 # 74
"/home/user/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/kernel/linux/arch/arm/include/asm/unified.h"

The error also occurs in other variations. The long file paths in the comments,
inserted by the preprocessor, are striking. 
I also observed the bug with the assembler v2.28 (stable Debian).

The file comes from the Linux kernel: arch/arm/kernel/entry-armv.S
(preprocessed)

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