kc3-lang/SDL/acinclude/ax_check_compiler_flags.m4

Branch - branch -v2.28

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• Hash : 0e45984f
  Author :
  Date : 2015-06-21T17:33:46
  

  Fixed crash if initialization of EGL failed but was tried again later. The internal function SDL_EGL_LoadLibrary() did not delete and remove a mostly uninitialized data structure if loading the library first failed. A later try to use EGL then skipped initialization and assumed it was previously successful because the data structure now already existed. This led to at least one crash in the internal function SDL_EGL_ChooseConfig() because a NULL pointer was dereferenced to make a call to eglBindAPI().

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• acinclude/ax_check_compiler_flags.m4

• # ===========================================================================
  #  http://www.gnu.org/software/autoconf-archive/ax_check_compiler_flags.html
  # ===========================================================================
  #
  # SYNOPSIS
  #
  #   AX_CHECK_COMPILER_FLAGS(FLAGS, [ACTION-SUCCESS], [ACTION-FAILURE])
  #
  # DESCRIPTION
  #
  #   Check whether the given compiler FLAGS work with the current language's
  #   compiler, or whether they give an error. (Warnings, however, are
  #   ignored.)
  #
  #   ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
  #   success/failure.
  #
  # LICENSE
  #
  #   Copyright (c) 2009 Steven G. Johnson <stevenj@alum.mit.edu>
  #   Copyright (c) 2009 Matteo Frigo
  #
  #   This program is free software: you can redistribute it and/or modify it
  #   under the terms of the GNU General Public License as published by the
  #   Free Software Foundation, either version 3 of the License, or (at your
  #   option) any later version.
  #
  #   This program is distributed in the hope that it will be useful, but
  #   WITHOUT ANY WARRANTY; without even the implied warranty of
  #   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
  #   Public License for more details.
  #
  #   You should have received a copy of the GNU General Public License along
  #   with this program. If not, see <http://www.gnu.org/licenses/>.
  #
  #   As a special exception, the respective Autoconf Macro's copyright owner
  #   gives unlimited permission to copy, distribute and modify the configure
  #   scripts that are the output of Autoconf when processing the Macro. You
  #   need not follow the terms of the GNU General Public License when using
  #   or distributing such scripts, even though portions of the text of the
  #   Macro appear in them. The GNU General Public License (GPL) does govern
  #   all other use of the material that constitutes the Autoconf Macro.
  #
  #   This special exception to the GPL applies to versions of the Autoconf
  #   Macro released by the Autoconf Archive. When you make and distribute a
  #   modified version of the Autoconf Macro, you may extend this special
  #   exception to the GPL to apply to your modified version as well.
  
  #serial 9
  
  AC_DEFUN([AX_CHECK_COMPILER_FLAGS],
  [AC_PREREQ(2.59) dnl for _AC_LANG_PREFIX
  AC_MSG_CHECKING([whether _AC_LANG compiler accepts $1])
  dnl Some hackery here since AC_CACHE_VAL can't handle a non-literal varname:
  AS_LITERAL_IF([$1],
    [AC_CACHE_VAL(AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1]), [
        ax_save_FLAGS=$[]_AC_LANG_PREFIX[]FLAGS
        _AC_LANG_PREFIX[]FLAGS="$1"
        AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
          AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1])=yes,
          AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1])=no)
        _AC_LANG_PREFIX[]FLAGS=$ax_save_FLAGS])],
    [ax_save_FLAGS=$[]_AC_LANG_PREFIX[]FLAGS
     _AC_LANG_PREFIX[]FLAGS="$1"
     AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
       eval AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1])=yes,
       eval AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1])=no)
     _AC_LANG_PREFIX[]FLAGS=$ax_save_FLAGS])
  eval ax_check_compiler_flags=$AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1])
  AC_MSG_RESULT($ax_check_compiler_flags)
  if test "x$ax_check_compiler_flags" = xyes; then
  	m4_default([$2], :)
  else
  	m4_default([$3], :)
  fi
  ])dnl AX_CHECK_COMPILER_FLAGS
  

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