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From: "wcs84014 at xcoxc dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug preprocessor/107089] New: Line-terminating '\' leaves the
 characters when the next-line is a multi-line comment
Date: Thu, 29 Sep 2022 17:47:50 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: preprocessor
X-Bugzilla-Version: 11.2.0
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: wcs84014 at xcoxc dot com
X-Bugzilla-Status: UNCONFIRMED
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107089

            Bug ID: 107089
           Summary: Line-terminating '\' leaves the characters when the
                    next-line is a multi-line comment
           Product: gcc
           Version: 11.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: preprocessor
          Assignee: unassigned at gcc dot gnu.org
          Reporter: wcs84014 at xcoxc dot com
  Target Milestone: ---

I found it when I tried to use the CPP as a general-purpose macro.

~$ gcc -v
Target: x86_64-linux-gnu /gcc version 11.2.0 (Debian 11.2.0-13)

~$ cat a.c
1=3D\
//xyz
ok*/

2=3D\
/*xyz
NG*/

3=3D\(sp)(nl)
/*xyz
NG*/

4=3D\
//*xyz
ok:gcc NG:-traditional*/


~$ cat a.c | cpp -P -C -nostdinc  #-traditional-cpp
1=3D//xyz
ok*/
2=3D/*xyz
z
NG*/
<stdin>:9:3: warning: backslash and newline separated by space
3=3D/*xyz
yz
NG*/
4=3D//*xyz
ok:gcc NG:-traditional*/=