| 1 | # eoverflow.m4 serial 2
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| 2 | dnl Copyright (C) 2004, 2006 Free Software Foundation, Inc.
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| 3 | dnl This file is free software; the Free Software Foundation
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| 4 | dnl gives unlimited permission to copy and/or distribute it,
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| 5 | dnl with or without modifications, as long as this notice is preserved.
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| 6 |
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| 7 | dnl From Bruno Haible.
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| 8 |
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| 9 | # The EOVERFLOW errno value ought to be defined in <errno.h>, according to
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| 10 | # POSIX. But some systems (like AIX 3) don't define it, and some systems
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| 11 | # (like OSF/1) define it when _XOPEN_SOURCE_EXTENDED is defined.
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| 12 |
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| 13 | # Define EOVERFLOW as a C macro and as a substituted macro in such a way that
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| 14 | # 1. on all systems, after inclusion of <errno.h>, EOVERFLOW is usable,
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| 15 | # 2. on systems where EOVERFLOW is defined elsewhere, we use the same numeric
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| 16 | # value.
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| 17 |
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| 18 | AC_DEFUN([gl_EOVERFLOW],
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| 19 | [
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| 20 | AC_REQUIRE([AC_PROG_CC])dnl
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| 21 |
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| 22 | AC_CACHE_CHECK([for EOVERFLOW], ac_cv_decl_EOVERFLOW, [
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| 23 | AC_EGREP_CPP(yes,[
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| 24 | #include <errno.h>
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| 25 | #ifdef EOVERFLOW
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| 26 | yes
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| 27 | #endif
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| 28 | ], have_eoverflow=1)
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| 29 | if test -n "$have_eoverflow"; then
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| 30 | dnl EOVERFLOW exists in <errno.h>. Don't need to define EOVERFLOW ourselves.
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| 31 | ac_cv_decl_EOVERFLOW=yes
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| 32 | else
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| 33 | AC_EGREP_CPP(yes,[
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| 34 | #define _XOPEN_SOURCE_EXTENDED 1
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| 35 | #include <errno.h>
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| 36 | #ifdef EOVERFLOW
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| 37 | yes
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| 38 | #endif
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| 39 | ], have_eoverflow=1)
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| 40 | if test -n "$have_eoverflow"; then
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| 41 | dnl EOVERFLOW exists but is hidden.
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| 42 | dnl Define it to the same value.
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| 43 | AC_COMPUTE_INT([ac_cv_decl_EOVERFLOW], [EOVERFLOW], [
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| 44 | #define _XOPEN_SOURCE_EXTENDED 1
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| 45 | #include <errno.h>
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| 46 | /* The following two lines are a workaround against an autoconf-2.52 bug. */
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| 47 | #include <stdio.h>
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| 48 | #include <stdlib.h>
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| 49 | ])
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| 50 | else
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| 51 | dnl EOVERFLOW isn't defined by the system. Define EOVERFLOW ourselves, but
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| 52 | dnl don't define it as EINVAL, because snprintf() callers want to
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| 53 | dnl distinguish EINVAL and EOVERFLOW.
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| 54 | ac_cv_decl_EOVERFLOW=E2BIG
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| 55 | fi
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| 56 | fi
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| 57 | ])
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| 58 | if test "$ac_cv_decl_EOVERFLOW" != yes; then
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| 59 | AC_DEFINE_UNQUOTED([EOVERFLOW], [$ac_cv_decl_EOVERFLOW],
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| 60 | [Define as good substitute value for EOVERFLOW.])
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| 61 | EOVERFLOW="$ac_cv_decl_EOVERFLOW"
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| 62 | AC_SUBST(EOVERFLOW)
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| 63 | fi
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| 64 | ])
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| 65 |
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| 66 | dnl Autoconf >= 2.61 has AC_COMPUTE_INT built-in.
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| 67 | dnl Remove this when we can assume autoconf >= 2.61.
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| 68 | m4_ifdef([AC_COMPUTE_INT], [], [
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| 69 | AC_DEFUN([AC_COMPUTE_INT], [_AC_COMPUTE_INT([$2],[$1],[$3],[$4])])
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| 70 | ])
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