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71 lines
2.3 KiB
Plaintext
71 lines
2.3 KiB
Plaintext
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# eoverflow.m4 serial 2
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dnl Copyright (C) 2004, 2006 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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dnl From Bruno Haible.
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# The EOVERFLOW errno value ought to be defined in <errno.h>, according to
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# POSIX. But some systems (like AIX 3) don't define it, and some systems
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# (like OSF/1) define it when _XOPEN_SOURCE_EXTENDED is defined.
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# Define EOVERFLOW as a C macro and as a substituted macro in such a way that
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# 1. on all systems, after inclusion of <errno.h>, EOVERFLOW is usable,
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# 2. on systems where EOVERFLOW is defined elsewhere, we use the same numeric
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# value.
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AC_DEFUN([gl_EOVERFLOW],
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[
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AC_REQUIRE([AC_PROG_CC])dnl
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AC_CACHE_CHECK([for EOVERFLOW], ac_cv_decl_EOVERFLOW, [
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AC_EGREP_CPP(yes,[
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#include <errno.h>
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#ifdef EOVERFLOW
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yes
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#endif
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], have_eoverflow=1)
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if test -n "$have_eoverflow"; then
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dnl EOVERFLOW exists in <errno.h>. Don't need to define EOVERFLOW ourselves.
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ac_cv_decl_EOVERFLOW=yes
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else
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AC_EGREP_CPP(yes,[
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#define _XOPEN_SOURCE_EXTENDED 1
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#include <errno.h>
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#ifdef EOVERFLOW
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yes
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#endif
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], have_eoverflow=1)
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if test -n "$have_eoverflow"; then
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dnl EOVERFLOW exists but is hidden.
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dnl Define it to the same value.
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AC_COMPUTE_INT([ac_cv_decl_EOVERFLOW], [EOVERFLOW], [
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#define _XOPEN_SOURCE_EXTENDED 1
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#include <errno.h>
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/* The following two lines are a workaround against an autoconf-2.52 bug. */
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#include <stdio.h>
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#include <stdlib.h>
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])
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else
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dnl EOVERFLOW isn't defined by the system. Define EOVERFLOW ourselves, but
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dnl don't define it as EINVAL, because snprintf() callers want to
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dnl distinguish EINVAL and EOVERFLOW.
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ac_cv_decl_EOVERFLOW=E2BIG
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fi
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fi
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])
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if test "$ac_cv_decl_EOVERFLOW" != yes; then
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AC_DEFINE_UNQUOTED([EOVERFLOW], [$ac_cv_decl_EOVERFLOW],
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[Define as good substitute value for EOVERFLOW.])
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EOVERFLOW="$ac_cv_decl_EOVERFLOW"
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AC_SUBST(EOVERFLOW)
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fi
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])
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dnl Autoconf >= 2.61 has AC_COMPUTE_INT built-in.
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dnl Remove this when we can assume autoconf >= 2.61.
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m4_ifdef([AC_COMPUTE_INT], [], [
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AC_DEFUN([AC_COMPUTE_INT], [_AC_COMPUTE_INT([$2],[$1],[$3],[$4])])
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])
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