diff options
| author | Yang Tse <yangsita@gmail.com> | 2009-09-29 16:34:03 +0000 |
|---|---|---|
| committer | Yang Tse <yangsita@gmail.com> | 2009-09-29 16:34:03 +0000 |
| commit | 4271f44a9ec2d505bdf506e1959850c35ee756a6 (patch) | |
| tree | e0fb0e46e782e5639f9a7cfa03e5bce75dedda9f /ares/m4 | |
| parent | 78d07cb0f9170f84930d5374c5e516620e8107df (diff) | |
Check if _REENTRANT definition is required to
make errno available as a preprocessor macro.
Diffstat (limited to 'ares/m4')
| -rw-r--r-- | ares/m4/cares-reentrant.m4 | 59 |
1 files changed, 57 insertions, 2 deletions
diff --git a/ares/m4/cares-reentrant.m4 b/ares/m4/cares-reentrant.m4 index 8962da47c..5793b7791 100644 --- a/ares/m4/cares-reentrant.m4 +++ b/ares/m4/cares-reentrant.m4 @@ -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 "$tmp_errno" = "yes"; then + AC_COMPILE_IFELSE([ + AC_LANG_PROGRAM([[ +#include <errno.h> + ]],[[ +#ifdef errno + int dummy=1; +#else + force compilation error +#endif + ]]) + ],[ + tmp_errno="errno_macro_defined" + ],[ + AC_COMPILE_IFELSE([ + AC_LANG_PROGRAM([[ +#define _REENTRANT +#include <errno.h> + ]],[[ +#ifdef errno + int dummy=1; +#else + force compilation error +#endif + ]]) + ],[ + tmp_errno="errno_macro_needs_reentrant" + tmp_need_reentrant="yes" + ]) + ]) + fi +]) + + dnl CARES_CHECK_NEED_REENTRANT_GMTIME_R dnl ------------------------------------------------- dnl Checks if the preprocessor _REENTRANT definition @@ -438,6 +490,9 @@ AC_DEFUN([CARES_CONFIGURE_REENTRANT], [ AC_MSG_CHECKING([if _REENTRANT is actually needed]) CARES_CHECK_NEED_REENTRANT_SYSTEM if test "$tmp_need_reentrant" = "no"; then + CARES_CHECK_NEED_REENTRANT_ERRNO + fi + if test "$tmp_need_reentrant" = "no"; then CARES_CHECK_NEED_REENTRANT_FUNCTIONS_R fi if test "$tmp_need_reentrant" = "yes"; then |