sysdeps/generic/gcc-compat.h

   1 /* Macros for checking required GCC compatibility.  Generic version.
   2    Copyright (C) 2014-2024 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