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libiconv v1.14

    1: # setenv.m4 serial 24
    2: dnl Copyright (C) 2001-2004, 2006-2011 Free Software Foundation, Inc.
    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: 
    7: AC_DEFUN([gl_FUNC_SETENV],
    8: [
    9:   AC_REQUIRE([gl_FUNC_SETENV_SEPARATE])
   10:   if test $ac_cv_func_setenv = no; then
   11:     HAVE_SETENV=0
   12:   else
   13:     AC_CACHE_CHECK([whether setenv validates arguments],
   14:       [gl_cv_func_setenv_works],
   15:       [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
   16:        #include <stdlib.h>
   17:        #include <errno.h>
   18:        #include <string.h>
   19:       ]], [[
   20:        int result = 0;
   21:        {
   22:          if (setenv ("", "", 0) != -1)
   23:            result |= 1;
   24:          else if (errno != EINVAL)
   25:            result |= 2;
   26:        }
   27:        {
   28:          if (setenv ("a", "=", 1) != 0)
   29:            result |= 4;
   30:          else if (strcmp (getenv ("a"), "=") != 0)
   31:            result |= 8;
   32:        }
   33:        return result;
   34:       ]])],
   35:       [gl_cv_func_setenv_works=yes], [gl_cv_func_setenv_works=no],
   36:       [gl_cv_func_setenv_works="guessing no"])])
   37:     if test "$gl_cv_func_setenv_works" != yes; then
   38:       REPLACE_SETENV=1
   39:     fi
   40:   fi
   41: ])
   42: 
   43: # Like gl_FUNC_SETENV, except prepare for separate compilation
   44: # (no REPLACE_SETENV, no AC_LIBOBJ).
   45: AC_DEFUN([gl_FUNC_SETENV_SEPARATE],
   46: [
   47:   AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
   48:   AC_CHECK_DECLS_ONCE([setenv])
   49:   if test $ac_cv_have_decl_setenv = no; then
   50:     HAVE_DECL_SETENV=0
   51:   fi
   52:   AC_CHECK_FUNCS_ONCE([setenv])
   53:   gl_PREREQ_SETENV
   54: ])
   55: 
   56: AC_DEFUN([gl_FUNC_UNSETENV],
   57: [
   58:   AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
   59:   AC_CHECK_DECLS_ONCE([unsetenv])
   60:   if test $ac_cv_have_decl_unsetenv = no; then
   61:     HAVE_DECL_UNSETENV=0
   62:   fi
   63:   AC_CHECK_FUNCS([unsetenv])
   64:   if test $ac_cv_func_unsetenv = no; then
   65:     HAVE_UNSETENV=0
   66:   else
   67:     HAVE_UNSETENV=1
   68:     dnl Some BSDs return void, failing to do error checking.
   69:     AC_CACHE_CHECK([for unsetenv() return type], [gt_cv_func_unsetenv_ret],
   70:       [AC_COMPILE_IFELSE(
   71:          [AC_LANG_PROGRAM(
   72:             [[
   73: #undef _BSD
   74: #define _BSD 1 /* unhide unsetenv declaration in OSF/1 5.1 <stdlib.h> */
   75: #include <stdlib.h>
   76: extern
   77: #ifdef __cplusplus
   78: "C"
   79: #endif
   80: #if defined(__STDC__) || defined(__cplusplus)
   81: int unsetenv (const char *name);
   82: #else
   83: int unsetenv();
   84: #endif
   85:             ]],
   86:             [[]])],
   87:          [gt_cv_func_unsetenv_ret='int'],
   88:          [gt_cv_func_unsetenv_ret='void'])])
   89:     if test $gt_cv_func_unsetenv_ret = 'void'; then
   90:       AC_DEFINE([VOID_UNSETENV], [1], [Define to 1 if unsetenv returns void
   91:        instead of int.])
   92:       REPLACE_UNSETENV=1
   93:     fi
   94: 
   95:     dnl Solaris 10 unsetenv does not remove all copies of a name.
   96:     dnl Haiku alpha 2 unsetenv gets confused by assignment to environ.
   97:     dnl OpenBSD 4.7 unsetenv("") does not fail.
   98:     AC_CACHE_CHECK([whether unsetenv obeys POSIX],
   99:       [gl_cv_func_unsetenv_works],
  100:       [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
  101:        #include <stdlib.h>
  102:        #include <errno.h>
  103:        extern char **environ;
  104:       ]], [[
  105:        char entry1[] = "a=1";
  106:        char entry2[] = "b=2";
  107:        char *env[] = { entry1, entry2, NULL };
  108:        if (putenv ((char *) "a=1")) return 1;
  109:        if (putenv (entry2)) return 2;
  110:        entry2[0] = 'a';
  111:        unsetenv ("a");
  112:        if (getenv ("a")) return 3;
  113:        if (!unsetenv ("") || errno != EINVAL) return 4;
  114:        entry2[0] = 'b';
  115:        environ = env;
  116:        if (!getenv ("a")) return 5;
  117:        entry2[0] = 'a';
  118:        unsetenv ("a");
  119:        if (getenv ("a")) return 6;
  120:       ]])],
  121:       [gl_cv_func_unsetenv_works=yes], [gl_cv_func_unsetenv_works=no],
  122:       [gl_cv_func_unsetenv_works="guessing no"])])
  123:     if test "$gl_cv_func_unsetenv_works" != yes; then
  124:       REPLACE_UNSETENV=1
  125:     fi
  126:   fi
  127: ])
  128: 
  129: # Prerequisites of lib/setenv.c.
  130: AC_DEFUN([gl_PREREQ_SETENV],
  131: [
  132:   AC_REQUIRE([AC_FUNC_ALLOCA])
  133:   AC_REQUIRE([gl_ENVIRON])
  134:   AC_CHECK_HEADERS_ONCE([unistd.h])
  135:   AC_CHECK_HEADERS([search.h])
  136:   AC_CHECK_FUNCS([tsearch])
  137: ])
  138: 
  139: # Prerequisites of lib/unsetenv.c.
  140: AC_DEFUN([gl_PREREQ_UNSETENV],
  141: [
  142:   AC_REQUIRE([gl_ENVIRON])
  143:   AC_CHECK_HEADERS_ONCE([unistd.h])
  144: ])