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Check if _REENTRANT definition is required to

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make errno available as a preprocessor macro.
This commit is contained in:
Yang Tse
2009-09-29 16:34:03 +00:00
parent 85442b2a4b
commit bd4a8c159e
1 changed files with 57 additions and 2 deletions
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m4/cares-reentrant.m4
+57 -2
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@@ -1,7 +1,7 @@
#***************************************************************************
# $Id$
#
# Copyright (C) 2008 by Daniel Stenberg et al
# Copyright (C) 2008 - 2009 by Daniel Stenberg et al
#
# Permission to use, copy, modify, and distribute this software and its
# documentation for any purpose and without fee is hereby granted, provided
@@ -16,7 +16,7 @@
#***************************************************************************
# File version for 'aclocal' use. Keep it a single number.
# serial 3
# serial 4
dnl Note 1
dnl ------
@@ -25,6 +25,58 @@ dnl conditionally include header files. These macros are used early in the
dnl configure process much before header file availability is known.
dnl CARES_CHECK_NEED_REENTRANT_ERRNO
dnl -------------------------------------------------
dnl Checks if the preprocessor _REENTRANT definition
dnl makes errno available as a preprocessor macro.
AC_DEFUN([CARES_CHECK_NEED_REENTRANT_ERRNO], [
AC_COMPILE_IFELSE([
AC_LANG_PROGRAM([[
#include <errno.h>
]],[[
if(0 != errno)
return 1;
]])
],[
tmp_errno="yes"
],[
tmp_errno="no"
])
if test "$tmp_errno" = "yes"; then
AC_COMPILE_IFELSE([
AC_LANG_PROGRAM([[
#include <errno.h>
]],[[
#ifdef errno
int dummy=1;
#else
force compilation error
#endif
]])
],[
tmp_errno="errno_macro_defined"
],[
AC_COMPILE_IFELSE([
AC_LANG_PROGRAM([[
#define _REENTRANT
#include <errno.h>
]],[[
#ifdef errno
int dummy=1;
#else
force compilation error
#endif
]])
],[
tmp_errno="errno_macro_needs_reentrant"
tmp_need_reentrant="yes"
])
])
fi
])
dnl CARES_CHECK_NEED_REENTRANT_GMTIME_R
dnl -------------------------------------------------
dnl Checks if the preprocessor _REENTRANT definition
@@ -437,6 +489,9 @@ AC_DEFUN([CARES_CONFIGURE_REENTRANT], [
if test "$tmp_reentrant_initially_defined" = "no"; then
AC_MSG_CHECKING([if _REENTRANT is actually needed])
CARES_CHECK_NEED_REENTRANT_SYSTEM
if test "$tmp_need_reentrant" = "no"; then
CARES_CHECK_NEED_REENTRANT_ERRNO
fi
if test "$tmp_need_reentrant" = "no"; then
CARES_CHECK_NEED_REENTRANT_FUNCTIONS_R
fi