kc3-lang/gnulib/m4/memalign.m4

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• Hash : 32a72f45
  Author :
  Date : 2023-01-01T01:14:21
  

  maint: run 'make update-copyright'
  

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• m4/memalign.m4

• # memalign.m4 serial 1
  dnl Copyright (C) 2020-2023 Free Software Foundation, Inc.
  dnl This file is free software; the Free Software Foundation
  dnl gives unlimited permission to copy and/or distribute it,
  dnl with or without modifications, as long as this notice is preserved.
  
  AC_DEFUN([gl_FUNC_MEMALIGN],
  [
    AC_REQUIRE([gl_MALLOC_H_DEFAULTS])
    AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
  
    AC_CHECK_FUNCS_ONCE([memalign])
    if test $ac_cv_func_memalign = yes; then
      dnl On Solaris 11, memalign (2, n) always returns NULL.
      AC_CACHE_CHECK([whether memalign works for small alignments],
        [gl_cv_func_memalign_works],
        [AC_RUN_IFELSE(
           [AC_LANG_PROGRAM(
              [[#include <malloc.h>
                #include <stdlib.h>
              ]],
              [[int result = 0;
                if (memalign (1, 1) == NULL)
                  result |= 1;
                if (memalign (2, 1) == NULL)
                  result |= 2;
                return result;
              ]])
           ],
           [gl_cv_func_memalign_works=yes],
           [gl_cv_func_memalign_works=no],
           [case "$host_os" in
                        # Guess no on Solaris.
              solaris*) gl_cv_func_memalign_works="guessing no" ;;
                        # If we don't know, obey --enable-cross-guesses.
              *)        gl_cv_func_memalign_works="$gl_cross_guess_normal" ;;
            esac
           ])
        ])
      case "$gl_cv_func_memalign_works" in
        *yes) ;;
        *) REPLACE_MEMALIGN=1 ;;
      esac
    else
      dnl The system does not have memalign.
      HAVE_MEMALIGN=0
    fi
  ])
  

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