1# setenv.m4 serial 16 2dnl Copyright (C) 2001-2004, 2006-2010 Free Software Foundation, Inc. 3dnl This file is free software; the Free Software Foundation 4dnl gives unlimited permission to copy and/or distribute it, 5dnl with or without modifications, as long as this notice is preserved. 6 7AC_DEFUN([gl_FUNC_SETENV], 8[ 9 AC_REQUIRE([gl_FUNC_SETENV_SEPARATE]) 10 if test $HAVE_SETENV$REPLACE_SETENV != 10; then 11 AC_LIBOBJ([setenv]) 12 fi 13]) 14 15# Like gl_FUNC_SETENV, except prepare for separate compilation (no AC_LIBOBJ). 16AC_DEFUN([gl_FUNC_SETENV_SEPARATE], 17[ 18 AC_REQUIRE([gl_STDLIB_H_DEFAULTS]) 19 AC_CHECK_FUNCS_ONCE([setenv]) 20 if test $ac_cv_func_setenv = no; then 21 HAVE_SETENV=0 22 else 23 AC_CACHE_CHECK([whether setenv validates arguments], 24 [gl_cv_func_setenv_works], 25 [AC_RUN_IFELSE([AC_LANG_PROGRAM([[ 26 #include <stdlib.h> 27 #include <errno.h> 28 #include <string.h> 29 ]], [[ 30 if (setenv ("", "", 0) != -1) return 1; 31 if (errno != EINVAL) return 2; 32 if (setenv ("a", "=", 1) != 0) return 3; 33 if (strcmp (getenv ("a"), "=") != 0) return 4; 34 ]])], 35 [gl_cv_func_setenv_works=yes], [gl_cv_func_setenv_works=no], 36 [gl_cv_func_setenv_works="guessing no"])]) 37 if test "$gl_cv_func_setenv_works" != yes; then 38 REPLACE_SETENV=1 39 AC_LIBOBJ([setenv]) 40 fi 41 fi 42 gl_PREREQ_SETENV 43]) 44 45AC_DEFUN([gl_FUNC_UNSETENV], 46[ 47 AC_REQUIRE([gl_STDLIB_H_DEFAULTS]) 48 AC_CHECK_FUNCS([unsetenv]) 49 if test $ac_cv_func_unsetenv = no; then 50 HAVE_UNSETENV=0 51 AC_LIBOBJ([unsetenv]) 52 gl_PREREQ_UNSETENV 53 else 54 dnl Some BSDs return void, failing to do error checking. 55 AC_CACHE_CHECK([for unsetenv() return type], [gt_cv_func_unsetenv_ret], 56 [AC_TRY_COMPILE([#include <stdlib.h> 57extern 58#ifdef __cplusplus 59"C" 60#endif 61#if defined(__STDC__) || defined(__cplusplus) 62int unsetenv (const char *name); 63#else 64int unsetenv(); 65#endif 66], , gt_cv_func_unsetenv_ret='int', gt_cv_func_unsetenv_ret='void')]) 67 if test $gt_cv_func_unsetenv_ret = 'void'; then 68 AC_DEFINE([VOID_UNSETENV], [1], [Define to 1 if unsetenv returns void 69 instead of int.]) 70 REPLACE_UNSETENV=1 71 AC_LIBOBJ([unsetenv]) 72 fi 73 74 dnl Solaris 10 unsetenv does not remove all copies of a name. 75 AC_CACHE_CHECK([whether unsetenv works on duplicates], 76 [gl_cv_func_unsetenv_works], 77 [AC_RUN_IFELSE([AC_LANG_PROGRAM([[ 78 #include <stdlib.h> 79 ]], [[ 80 char entry[] = "b=2"; 81 if (putenv ((char *) "a=1")) return 1; 82 if (putenv (entry)) return 2; 83 entry[0] = 'a'; 84 unsetenv ("a"); 85 if (getenv ("a")) return 3; 86 ]])], 87 [gl_cv_func_unsetenv_works=yes], [gl_cv_func_unsetenv_works=no], 88 [gl_cv_func_unsetenv_works="guessing no"])]) 89 if test "$gl_cv_func_unsetenv_works" != yes; then 90 REPLACE_UNSETENV=1 91 AC_LIBOBJ([unsetenv]) 92 fi 93 fi 94]) 95 96# Prerequisites of lib/setenv.c. 97AC_DEFUN([gl_PREREQ_SETENV], 98[ 99 AC_REQUIRE([AC_FUNC_ALLOCA]) 100 AC_REQUIRE([gl_ENVIRON]) 101 AC_CHECK_HEADERS_ONCE([unistd.h]) 102 AC_CHECK_HEADERS([search.h]) 103 AC_CHECK_FUNCS([tsearch]) 104]) 105 106# Prerequisites of lib/unsetenv.c. 107AC_DEFUN([gl_PREREQ_UNSETENV], 108[ 109 AC_REQUIRE([gl_ENVIRON]) 110 AC_CHECK_HEADERS_ONCE([unistd.h]) 111]) 112