1  /* Macros for checking required GCC compatibility.  Generic version.
       2     Copyright (C) 2014-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  /* This is the base file.  More-specific sysdeps/.../gcc-compat.h files
      20     can define GCC_COMPAT_VERSION and then #include_next this file.  */
      21  
      22  #ifndef _GENERIC_GCC_COMPAT_H
      23  #define _GENERIC_GCC_COMPAT_H 1
      24  
      25  /* This is the macro that gets used in #if tests in code: true iff
      26     the library we build must be compatible with user code built by
      27     GCC version MAJOR.MINOR.  */
      28  #define GCC_COMPAT(major, minor)        \
      29    (GCC_COMPAT_VERSION <= GCC_VERSION (major, minor))
      30  
      31  /* This is how we compose an integer from major and minor version
      32     numbers, for comparison.  */
      33  #define GCC_VERSION(major, minor)       \
      34    (((major) << 16) + (minor))
      35  
      36  #ifndef GCC_COMPAT_VERSION
      37  /* GCC 2.7.2 was current at the time of the glibc-2.0 release.
      38     We assume nothing before that ever mattered.  */
      39  # define GCC_COMPAT_VERSION     GCC_VERSION (2, 7)
      40  #endif
      41  
      42  #endif