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author | Paul Eggert <eggert@cs.ucla.edu> | 2004-10-04 04:09:41 +0000 |
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committer | Paul Eggert <eggert@cs.ucla.edu> | 2004-10-04 04:09:41 +0000 |
commit | 55fbe6686af907ac025888e290c5b8ef879b5879 (patch) | |
tree | 32340229b3778f12901c6b9dd99401212a8d2f23 /m4/eoverflow.m4 | |
parent | 14f5062c301fcfb23fb265b9352cc2aa952036c9 (diff) | |
download | coreutils-55fbe6686af907ac025888e290c5b8ef879b5879.tar.xz |
Sync from gnulib.
Diffstat (limited to 'm4/eoverflow.m4')
-rw-r--r-- | m4/eoverflow.m4 | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/m4/eoverflow.m4 b/m4/eoverflow.m4 new file mode 100644 index 000000000..7e6cea3d1 --- /dev/null +++ b/m4/eoverflow.m4 @@ -0,0 +1,66 @@ +# eoverflow.m4 serial 1 +dnl Copyright (C) 2004 Free Software Foundation, Inc. +dnl This file is free software, distributed under the terms of the GNU +dnl General Public License. As a special exception to the GNU General +dnl Public License, this file may be distributed as part of a program +dnl that contains a configuration script generated by Autoconf, under +dnl the same distribution terms as the rest of that program. + +dnl From Bruno Haible. + +# The EOVERFLOW errno value ought to be defined in <errno.h>, according to +# POSIX. But some systems (like AIX 3) don't define it, and some systems +# (like OSF/1) define it when _XOPEN_SOURCE_EXTENDED is defined. + +# Define EOVERFLOW as a C macro and as a substituted macro in such a way that +# 1. on all systems, after inclusion of <errno.h>, EOVERFLOW is usable, +# 2. on systems where EOVERFLOW is defined elsewhere, we use the same numeric +# value. + +AC_DEFUN([gl_EOVERFLOW], +[ + AC_REQUIRE([AC_PROG_CC])dnl + + AC_CACHE_CHECK([for EOVERFLOW], ac_cv_decl_EOVERFLOW, [ + AC_EGREP_CPP(yes,[ +#include <errno.h> +#ifdef EOVERFLOW +yes +#endif + ], have_eoverflow=1) + if test -n "$have_eoverflow"; then + dnl EOVERFLOW exists in <errno.h>. Don't need to define EOVERFLOW ourselves. + ac_cv_decl_EOVERFLOW=yes + else + AC_EGREP_CPP(yes,[ +#define _XOPEN_SOURCE_EXTENDED 1 +#include <errno.h> +#ifdef EOVERFLOW +yes +#endif + ], have_eoverflow=1) + if test -n "$have_eoverflow"; then + dnl EOVERFLOW exists but is hidden. + dnl Define it to the same value. + _AC_COMPUTE_INT([EOVERFLOW], ac_cv_decl_EOVERFLOW, [ +#define _XOPEN_SOURCE_EXTENDED 1 +#include <errno.h> +/* The following two lines are a workaround against an autoconf-2.52 bug. */ +#include <stdio.h> +#include <stdlib.h> +]) + else + dnl EOVERFLOW isn't defined by the system. Define EOVERFLOW ourselves, but + dnl don't define it as EINVAL, because snprintf() callers want to + dnl distinguish EINVAL and EOVERFLOW. + ac_cv_decl_EOVERFLOW=E2BIG + fi + fi + ]) + if test "$ac_cv_decl_EOVERFLOW" != yes; then + AC_DEFINE_UNQUOTED([EOVERFLOW], [$ac_cv_decl_EOVERFLOW], + [Define as good substitute value for EOVERFLOW.]) + EOVERFLOW="$ac_cv_decl_EOVERFLOW" + AC_SUBST(EOVERFLOW) + fi +]) |