gdbsupport/compiler-type.m4

   1 dnl Autoconf configure script for GDB, the GNU debugger.
   2 dnl Copyright (C) 2022-2023 Free Software Foundation, Inc.
   3 dnl
   4 dnl This file is part of GDB.
   5 dnl
   6 dnl This program is free software; you can redistribute it and/or modify
   7 dnl it under the terms of the GNU General Public License as published by
   8 dnl the Free Software Foundation; either version 3 of the License, or
   9 dnl (at your option) any later version.
  10 dnl
  11 dnl This program is distributed in the hope that it will be useful,
  12 dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 dnl GNU General Public License for more details.
  15 dnl
  16 dnl You should have received a copy of the GNU General Public License
  17 dnl along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18
  19 # Sets up GDB_COMPILER_TYPE to either 'gcc', 'clang', or 'unknown'.
  20 # The autoconf compiler check will set GCC=yes for clang as well as
  21 # gcc, it's really more of a "is gcc like" check.
  22 #
  23 # By contrast, this will set the GDB_COMPILER_TYPE to 'gcc' only for
  24 # versions of gcc.
  25 #
  26 # There's no reason why this can't be extended to identify other
  27 # compiler types if needed in the future, users of this variable
  28 # should therefore avoid relying on the 'unknown' value, instead
  29 # checks should be written in terms of the known compiler types.
  30 AC_DEFUN([AM_GDB_COMPILER_TYPE],[
  31
  32   AC_CACHE_CHECK([the compiler type],
  33                  [gdb_cv_compiler_type],
  34  [gdb_cv_compiler_type=unknown
  35   if test "$gdb_cv_compiler_type" = unknown; then
  36      AC_COMPILE_IFELSE(
  37         [AC_LANG_PROGRAM([],
  38                          [
  39                           #if !defined __GNUC__ || defined __clang__
  40                           #error not gcc
  41                           #endif
  42                          ])],
  43         [gdb_cv_compiler_type=gcc], [])
  44   fi
  45
  46   if test "$gdb_cv_compiler_type" = unknown; then
  47      AC_COMPILE_IFELSE(
  48         [AC_LANG_PROGRAM([],
  49                          [
  50                           #ifndef __clang__
  51                           #error not clang
  52                           #endif
  53                          ])],
  54         [gdb_cv_compiler_type=clang], [])
  55   fi
  56  ])
  57
  58  GDB_COMPILER_TYPE="$gdb_cv_compiler_type"
  59 ])