-# setenv.m4 serial 7
-dnl Copyright (C) 2001-2004, 2006-2007 Free Software Foundation, Inc.
+# setenv.m4 serial 18
+dnl Copyright (C) 2001-2004, 2006-2010 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_SETENV],
[
+ AC_REQUIRE([gl_FUNC_SETENV_SEPARATE])
+ if test $HAVE_SETENV$REPLACE_SETENV != 10; then
+ AC_LIBOBJ([setenv])
+ fi
+])
+
+# Like gl_FUNC_SETENV, except prepare for separate compilation (no AC_LIBOBJ).
+AC_DEFUN([gl_FUNC_SETENV_SEPARATE],
+[
+ AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
AC_CHECK_FUNCS_ONCE([setenv])
if test $ac_cv_func_setenv = no; then
- AC_LIBOBJ([setenv])
- gl_PREREQ_SETENV
+ HAVE_SETENV=0
+ else
+ AC_CACHE_CHECK([whether setenv validates arguments],
+ [gl_cv_func_setenv_works],
+ [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
+ #include <stdlib.h>
+ #include <errno.h>
+ #include <string.h>
+ ]], [[
+ if (setenv ("", "", 0) != -1) return 1;
+ if (errno != EINVAL) return 2;
+ if (setenv ("a", "=", 1) != 0) return 3;
+ if (strcmp (getenv ("a"), "=") != 0) return 4;
+ ]])],
+ [gl_cv_func_setenv_works=yes], [gl_cv_func_setenv_works=no],
+ [gl_cv_func_setenv_works="guessing no"])])
+ if test "$gl_cv_func_setenv_works" != yes; then
+ REPLACE_SETENV=1
+ AC_LIBOBJ([setenv])
+ fi
fi
+ gl_PREREQ_SETENV
])
AC_DEFUN([gl_FUNC_UNSETENV],
[
+ AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
AC_CHECK_FUNCS([unsetenv])
if test $ac_cv_func_unsetenv = no; then
+ HAVE_UNSETENV=0
AC_LIBOBJ([unsetenv])
gl_PREREQ_UNSETENV
else
- AC_CACHE_CHECK([for unsetenv() return type], gt_cv_func_unsetenv_ret,
- [AC_TRY_COMPILE([#include <stdlib.h>
+ dnl Some BSDs return void, failing to do error checking.
+ AC_CACHE_CHECK([for unsetenv() return type], [gt_cv_func_unsetenv_ret],
+ [AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[
+#include <stdlib.h>
extern
#ifdef __cplusplus
"C"
#else
int unsetenv();
#endif
-], , gt_cv_func_unsetenv_ret='int', gt_cv_func_unsetenv_ret='void')])
+ ]],
+ [[]])],
+ [gt_cv_func_unsetenv_ret='int'],
+ [gt_cv_func_unsetenv_ret='void'])])
if test $gt_cv_func_unsetenv_ret = 'void'; then
- AC_DEFINE(VOID_UNSETENV, 1, [Define if unsetenv() returns void, not int.])
+ AC_DEFINE([VOID_UNSETENV], [1], [Define to 1 if unsetenv returns void
+ instead of int.])
+ REPLACE_UNSETENV=1
+ AC_LIBOBJ([unsetenv])
fi
- fi
-])
-# Check if a variable is properly declared.
-# gt_CHECK_VAR_DECL(includes,variable)
-AC_DEFUN([gt_CHECK_VAR_DECL],
-[
- define([gt_cv_var], [gt_cv_var_]$2[_declaration])
- AC_MSG_CHECKING([if $2 is properly declared])
- AC_CACHE_VAL(gt_cv_var, [
- AC_TRY_COMPILE([$1
- extern struct { int foo; } $2;],
- [$2.foo = 1;],
- gt_cv_var=no,
- gt_cv_var=yes)])
- AC_MSG_RESULT($gt_cv_var)
- if test $gt_cv_var = yes; then
- AC_DEFINE([HAVE_]translit($2, [a-z], [A-Z])[_DECL], 1,
- [Define if you have the declaration of $2.])
+ dnl Solaris 10 unsetenv does not remove all copies of a name.
+ dnl OpenBSD 4.7 unsetenv("") does not fail.
+ AC_CACHE_CHECK([whether unsetenv obeys POSIX],
+ [gl_cv_func_unsetenv_works],
+ [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
+ #include <stdlib.h>
+ #include <errno.h>
+ ]], [[
+ char entry[] = "b=2";
+ if (putenv ((char *) "a=1")) return 1;
+ if (putenv (entry)) return 2;
+ entry[0] = 'a';
+ unsetenv ("a");
+ if (getenv ("a")) return 3;
+ if (!unsetenv ("") || errno != EINVAL) return 4;
+ ]])],
+ [gl_cv_func_unsetenv_works=yes], [gl_cv_func_unsetenv_works=no],
+ [gl_cv_func_unsetenv_works="guessing no"])])
+ if test "$gl_cv_func_unsetenv_works" != yes; then
+ REPLACE_UNSETENV=1
+ AC_LIBOBJ([unsetenv])
+ fi
fi
])
AC_DEFUN([gl_PREREQ_SETENV],
[
AC_REQUIRE([AC_FUNC_ALLOCA])
- AC_CHECK_HEADERS_ONCE(unistd.h)
- AC_CHECK_HEADERS(search.h)
- AC_CHECK_FUNCS(tsearch)
- gt_CHECK_VAR_DECL([#include <unistd.h>], environ)
+ AC_REQUIRE([gl_ENVIRON])
+ AC_CHECK_HEADERS_ONCE([unistd.h])
+ AC_CHECK_HEADERS([search.h])
+ AC_CHECK_FUNCS([tsearch])
])
# Prerequisites of lib/unsetenv.c.
AC_DEFUN([gl_PREREQ_UNSETENV],
[
- AC_CHECK_HEADERS_ONCE(unistd.h)
- gt_CHECK_VAR_DECL([#include <unistd.h>], environ)
+ AC_REQUIRE([gl_ENVIRON])
+ AC_CHECK_HEADERS_ONCE([unistd.h])
])