-# setenv.m4 serial 6
-dnl Copyright (C) 2001-2004, 2006 Free Software Foundation, Inc.
+# setenv.m4 serial 26
+dnl Copyright (C) 2001-2004, 2006-2014 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([gt_FUNC_SETENV],
+AC_DEFUN([gl_FUNC_SETENV],
[
- AC_REPLACE_FUNCS(setenv unsetenv)
+ AC_REQUIRE([gl_FUNC_SETENV_SEPARATE])
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
if test $ac_cv_func_setenv = no; then
- gl_PREREQ_SETENV
+ HAVE_SETENV=0
+ else
+ AC_CACHE_CHECK([whether setenv validates arguments],
+ [gl_cv_func_setenv_works],
+ [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
+ #include <stdlib.h>
+ #include <errno.h>
+ #include <string.h>
+ ]], [[
+ int result = 0;
+ {
+ if (setenv ("", "", 0) != -1)
+ result |= 1;
+ else if (errno != EINVAL)
+ result |= 2;
+ }
+ {
+ if (setenv ("a", "=", 1) != 0)
+ result |= 4;
+ else if (strcmp (getenv ("a"), "=") != 0)
+ result |= 8;
+ }
+ return result;
+ ]])],
+ [gl_cv_func_setenv_works=yes], [gl_cv_func_setenv_works=no],
+ [case "$host_os" in
+ # Guess yes on glibc systems.
+ *-gnu*) gl_cv_func_setenv_works="guessing yes" ;;
+ # If we don't know, assume the worst.
+ *) gl_cv_func_setenv_works="guessing no" ;;
+ esac
+ ])])
+ case "$gl_cv_func_setenv_works" in
+ *yes) ;;
+ *)
+ REPLACE_SETENV=1
+ ;;
+ esac
fi
+])
+
+# Like gl_FUNC_SETENV, except prepare for separate compilation
+# (no REPLACE_SETENV, no AC_LIBOBJ).
+AC_DEFUN([gl_FUNC_SETENV_SEPARATE],
+[
+ AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
+ AC_CHECK_DECLS_ONCE([setenv])
+ if test $ac_cv_have_decl_setenv = no; then
+ HAVE_DECL_SETENV=0
+ fi
+ AC_CHECK_FUNCS_ONCE([setenv])
+ gl_PREREQ_SETENV
+])
+
+AC_DEFUN([gl_FUNC_UNSETENV],
+[
+ AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+ AC_CHECK_DECLS_ONCE([unsetenv])
+ if test $ac_cv_have_decl_unsetenv = no; then
+ HAVE_DECL_UNSETENV=0
+ fi
+ AC_CHECK_FUNCS([unsetenv])
if test $ac_cv_func_unsetenv = no; then
- gl_PREREQ_UNSETENV
+ HAVE_UNSETENV=0
else
- AC_CACHE_CHECK([for unsetenv() return type], gt_cv_func_unsetenv_ret,
- [AC_TRY_COMPILE([#include <stdlib.h>
+ HAVE_UNSETENV=1
+ 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(
+ [[
+#undef _BSD
+#define _BSD 1 /* unhide unsetenv declaration in OSF/1 5.1 <stdlib.h> */
+#include <stdlib.h>
extern
#ifdef __cplusplus
"C"
#endif
-#if defined(__STDC__) || defined(__cplusplus)
int unsetenv (const char *name);
-#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
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 $2.])
+ dnl Solaris 10 unsetenv does not remove all copies of a name.
+ dnl Haiku alpha 2 unsetenv gets confused by assignment to environ.
+ dnl OpenBSD 4.7 unsetenv("") does not fail.
+ AC_CACHE_CHECK([whether unsetenv obeys POSIX],
+ [gl_cv_func_unsetenv_works],
+ [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
+ #include <stdlib.h>
+ #include <errno.h>
+ extern char **environ;
+ ]], [[
+ char entry1[] = "a=1";
+ char entry2[] = "b=2";
+ char *env[] = { entry1, entry2, NULL };
+ if (putenv ((char *) "a=1")) return 1;
+ if (putenv (entry2)) return 2;
+ entry2[0] = 'a';
+ unsetenv ("a");
+ if (getenv ("a")) return 3;
+ if (!unsetenv ("") || errno != EINVAL) return 4;
+ entry2[0] = 'b';
+ environ = env;
+ if (!getenv ("a")) return 5;
+ entry2[0] = 'a';
+ unsetenv ("a");
+ if (getenv ("a")) return 6;
+ ]])],
+ [gl_cv_func_unsetenv_works=yes], [gl_cv_func_unsetenv_works=no],
+ [case "$host_os" in
+ # Guess yes on glibc systems.
+ *-gnu*) gl_cv_func_unsetenv_works="guessing yes" ;;
+ # If we don't know, assume the worst.
+ *) gl_cv_func_unsetenv_works="guessing no" ;;
+ esac
+ ])])
+ case "$gl_cv_func_unsetenv_works" in
+ *yes) ;;
+ *)
+ REPLACE_UNSETENV=1
+ ;;
+ esac
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])
])
projects / gnulib.git / blobdiff