Annotation of embedaddon/libiconv/srcm4/malloc.m4, revision 1.1.1.2
1.1.1.2 ! misho 1: # malloc.m4 serial 19
! 2: dnl Copyright (C) 2007, 2009-2019 Free Software Foundation, Inc.
1.1 misho 3: dnl This file is free software; the Free Software Foundation
4: dnl gives unlimited permission to copy and/or distribute it,
5: dnl with or without modifications, as long as this notice is preserved.
6:
1.1.1.2 ! misho 7: m4_version_prereq([2.70], [] ,[
! 8:
! 9: # This is adapted with modifications from upstream Autoconf here:
! 10: # https://git.savannah.gnu.org/cgit/autoconf.git/commit/?id=04be2b7a29d65d9a08e64e8e56e594c91749598c
! 11: AC_DEFUN([_AC_FUNC_MALLOC_IF],
! 12: [
! 13: AC_REQUIRE([AC_HEADER_STDC])dnl
! 14: AC_REQUIRE([AC_CANONICAL_HOST])dnl for cross-compiles
! 15: AC_CHECK_HEADERS([stdlib.h])
! 16: AC_CACHE_CHECK([for GNU libc compatible malloc],
! 17: [ac_cv_func_malloc_0_nonnull],
! 18: [AC_RUN_IFELSE(
! 19: [AC_LANG_PROGRAM(
! 20: [[#if defined STDC_HEADERS || defined HAVE_STDLIB_H
! 21: # include <stdlib.h>
! 22: #else
! 23: char *malloc ();
! 24: #endif
! 25: ]],
! 26: [[char *p = malloc (0);
! 27: int result = !p;
! 28: free (p);
! 29: return result;]])
! 30: ],
! 31: [ac_cv_func_malloc_0_nonnull=yes],
! 32: [ac_cv_func_malloc_0_nonnull=no],
! 33: [case "$host_os" in
! 34: # Guess yes on platforms where we know the result.
! 35: *-gnu* | gnu* | *-musl* | freebsd* | netbsd* | openbsd* \
! 36: | hpux* | solaris* | cygwin* | mingw*)
! 37: ac_cv_func_malloc_0_nonnull="guessing yes" ;;
! 38: # If we don't know, assume the worst.
! 39: *) ac_cv_func_malloc_0_nonnull="guessing no" ;;
! 40: esac
! 41: ])
! 42: ])
! 43: case "$ac_cv_func_malloc_0_nonnull" in
! 44: *yes)
! 45: $1
! 46: ;;
! 47: *)
! 48: $2
! 49: ;;
! 50: esac
! 51: ])# _AC_FUNC_MALLOC_IF
! 52:
! 53: ])
! 54:
! 55: # gl_FUNC_MALLOC_GNU
! 56: # ------------------
! 57: # Test whether 'malloc (0)' is handled like in GNU libc, and replace malloc if
! 58: # it is not.
! 59: AC_DEFUN([gl_FUNC_MALLOC_GNU],
! 60: [
! 61: AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
! 62: dnl _AC_FUNC_MALLOC_IF is defined in Autoconf.
! 63: _AC_FUNC_MALLOC_IF(
! 64: [AC_DEFINE([HAVE_MALLOC_GNU], [1],
! 65: [Define to 1 if your system has a GNU libc compatible 'malloc'
! 66: function, and to 0 otherwise.])],
! 67: [AC_DEFINE([HAVE_MALLOC_GNU], [0])
! 68: REPLACE_MALLOC=1
! 69: ])
! 70: ])
! 71:
1.1 misho 72: # gl_FUNC_MALLOC_POSIX
73: # --------------------
74: # Test whether 'malloc' is POSIX compliant (sets errno to ENOMEM when it
75: # fails), and replace malloc if it is not.
76: AC_DEFUN([gl_FUNC_MALLOC_POSIX],
77: [
1.1.1.2 ! misho 78: AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
1.1 misho 79: AC_REQUIRE([gl_CHECK_MALLOC_POSIX])
80: if test $gl_cv_func_malloc_posix = yes; then
81: AC_DEFINE([HAVE_MALLOC_POSIX], [1],
82: [Define if the 'malloc' function is POSIX compliant.])
83: else
1.1.1.2 ! misho 84: REPLACE_MALLOC=1
1.1 misho 85: fi
86: ])
87:
88: # Test whether malloc, realloc, calloc are POSIX compliant,
89: # Set gl_cv_func_malloc_posix to yes or no accordingly.
90: AC_DEFUN([gl_CHECK_MALLOC_POSIX],
91: [
92: AC_CACHE_CHECK([whether malloc, realloc, calloc are POSIX compliant],
93: [gl_cv_func_malloc_posix],
94: [
95: dnl It is too dangerous to try to allocate a large amount of memory:
96: dnl some systems go to their knees when you do that. So assume that
97: dnl all Unix implementations of the function are POSIX compliant.
1.1.1.2 ! misho 98: AC_COMPILE_IFELSE(
! 99: [AC_LANG_PROGRAM(
! 100: [[]],
! 101: [[#if defined _WIN32 && ! defined __CYGWIN__
! 102: choke me
! 103: #endif
! 104: ]])],
! 105: [gl_cv_func_malloc_posix=yes],
! 106: [gl_cv_func_malloc_posix=no])
1.1 misho 107: ])
108: ])
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