[Bug libc/28786] New: Glibc 2.34 introduces C++ build failures

[Bug libc/28786] New: Glibc 2.34 introduces C++ build failures

[krejzi at email dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=28786

            Bug ID: 28786
           Summary: Glibc 2.34 introduces C++ build failures
           Product: glibc
           Version: 2.34
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: krejzi at email dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

When using glibc-2.34 with gcc-11.2.0 to build C++ code, importing some
headers, for example, stdlib.h will throw an error


In file included from /mnt/lfs/tools/include/c++/11.2.0/cstdlib:75,
                 from
/home/armin/src/pacman/tools/bootstrap/cmake-3.22.1/Source/CursesDialog/ccmake.cxx:6:
/tools/include/stdlib.h:565:5: error: expected initializer before
'__attr_dealloc_free'
  565 |     __attr_dealloc_free;
      |     ^~~~~~~~~~~~~~~~~~~
/tools/include/stdlib.h:569:14: error: expected initializer before
'__attr_dealloc'
  569 |      __THROW __attr_dealloc (reallocarray, 1);
      |              ^~~~~~~~~~~~~~

There are also issues with other packages and different C headers included
inside C++ code. Please advise on how to proceed here. The problem is not
present in glibc-2.33 and it's triggered by glibc-2.34 upgrade.

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[Bug libc/28786] Glibc 2.34 introduces C++ build failures

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=28786

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |WAITING
   Last reconfirmed|                            |2022-01-17
                 CC|                            |fweimer at redhat dot com

--- Comment #1 from Florian Weimer <fweimer at redhat dot com> ---
Please attach preprocessed source code to this bug. Thanks.

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[Bug libc/28786] Glibc 2.34 introduces C++ build failures

[krejzi at email dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=28786

--- Comment #2 from Armin K. <krejzi at email dot com> ---
Created attachment 13959
  --> https://sourceware.org/bugzilla/attachment.cgi?id=13959&action=edit
Preprocessed file

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[Bug libc/28786] Glibc 2.34 introduces C++ build failures

[krejzi at email dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=28786

--- Comment #3 from Armin K. <krejzi at email dot com> ---
Reconfirmed with glibc-2.35.

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[Bug libc/28786] Glibc 2.34 introduces C++ build failures

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=28786

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |RESOLVED
         Resolution|---                         |WORKSFORME
              Flags|                            |security-

--- Comment #4 from Florian Weimer <fweimer at redhat dot com> ---
This seems to be some sort of sysroot escape.

# 75 "/mnt/lfs/tools/include/c++/11.2.0/cstdlib" 3
# 1 "/tools/include/stdlib.h" 1 3

But <sys/cdefs.h> is from the system default:

# 1 "/usr/include/sys/cdefs.h" 1 3

The system glibc version is probably older than this /tools/include/stdlib.h
file.

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