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From: "gerbilsoft at gerbilsoft dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug libc/28182] New: _TIME_BITS=64 in C++ has issues with fcntl and
 ioctl
Date: Tue, 03 Aug 2021 17:34:52 +0000
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X-Bugzilla-Version: 2.34
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D28182

            Bug ID: 28182
           Summary: _TIME_BITS=3D64 in C++ has issues with fcntl and ioctl
           Product: glibc
           Version: 2.34
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: gerbilsoft at gerbilsoft dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

Attempting to compile a 32-bit C++ program that uses fcntl.h or sys/ioctl.h=
 if
_TIME_BITS=3D64 results in an error related to exception handling.

Sample code:

#include <fcntl.h>

int main(void)
{
        return 0;
}

Compile with: g++ -m32 -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=3D64
-D_LARGEFILE64_SOURCE -D_TIME_BITS=3D64 -c test.cpp

Results:

In file included from /usr/include/features.h:488,
                 from /usr/include/fcntl.h:25,
                 from test.cpp:1:
/usr/include/fcntl.h:191:41: error: expected initializer before =E2=80=98no=
except=E2=80=99
  191 |                        __fcntl_time64)  __THROW;
      |                                         ^~~~~~~
/usr/include/fcntl.h:193:41: error: expected initializer before =E2=80=98no=
except=E2=80=99
  193 |                        __fcntl_time64)  __THROW;
      |                                         ^~~~~~~

The same code does compile if built as C code instead of as C++.

Software versions:

OS: Gentoo Linux
Arch: amd64 (Intel Core i7-3520M)
Compiler: gcc-11.1.0
glibc: 2.34

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