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| 1 # setenv.m4 serial 10 |
| 2 dnl Copyright (C) 2001-2004, 2006-2008 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_STDLIB_H_DEFAULTS]) |
| 10 AC_CHECK_FUNCS_ONCE([setenv]) |
| 11 if test $ac_cv_func_setenv = no; then |
| 12 HAVE_SETENV=0 |
| 13 AC_LIBOBJ([setenv]) |
| 14 gl_PREREQ_SETENV |
| 15 fi |
| 16 ]) |
| 17 |
| 18 # Like gl_FUNC_SETENV, except prepare for separate compilation (no AC_LIBOBJ). |
| 19 AC_DEFUN([gl_FUNC_SETENV_SEPARATE], |
| 20 [ |
| 21 AC_REQUIRE([gl_STDLIB_H_DEFAULTS]) |
| 22 AC_CHECK_FUNCS_ONCE([setenv]) |
| 23 if test $ac_cv_func_setenv = no; then |
| 24 HAVE_SETENV=0 |
| 25 fi |
| 26 gl_PREREQ_SETENV |
| 27 ]) |
| 28 |
| 29 AC_DEFUN([gl_FUNC_UNSETENV], |
| 30 [ |
| 31 AC_REQUIRE([gl_STDLIB_H_DEFAULTS]) |
| 32 AC_CHECK_FUNCS([unsetenv]) |
| 33 if test $ac_cv_func_unsetenv = no; then |
| 34 HAVE_UNSETENV=0 |
| 35 AC_LIBOBJ([unsetenv]) |
| 36 gl_PREREQ_UNSETENV |
| 37 else |
| 38 AC_CACHE_CHECK([for unsetenv() return type], gt_cv_func_unsetenv_ret, |
| 39 [AC_TRY_COMPILE([#include <stdlib.h> |
| 40 extern |
| 41 #ifdef __cplusplus |
| 42 "C" |
| 43 #endif |
| 44 #if defined(__STDC__) || defined(__cplusplus) |
| 45 int unsetenv (const char *name); |
| 46 #else |
| 47 int unsetenv(); |
| 48 #endif |
| 49 ], , gt_cv_func_unsetenv_ret='int', gt_cv_func_unsetenv_ret='void')]) |
| 50 if test $gt_cv_func_unsetenv_ret = 'void'; then |
| 51 VOID_UNSETENV=1 |
| 52 fi |
| 53 fi |
| 54 ]) |
| 55 |
| 56 # Prerequisites of lib/setenv.c. |
| 57 AC_DEFUN([gl_PREREQ_SETENV], |
| 58 [ |
| 59 AC_REQUIRE([AC_FUNC_ALLOCA]) |
| 60 AC_REQUIRE([gl_ENVIRON]) |
| 61 AC_CHECK_HEADERS_ONCE(unistd.h) |
| 62 AC_CHECK_HEADERS(search.h) |
| 63 AC_CHECK_FUNCS(tsearch) |
| 64 ]) |
| 65 |
| 66 # Prerequisites of lib/unsetenv.c. |
| 67 AC_DEFUN([gl_PREREQ_UNSETENV], |
| 68 [ |
| 69 AC_REQUIRE([gl_ENVIRON]) |
| 70 AC_CHECK_HEADERS_ONCE(unistd.h) |
| 71 ]) |
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