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Annotation of embedaddon/libiconv/m4/eilseq.m4, revision 1.1

1.1     ! misho       1: #serial 1
        !             2: 
        !             3: AC_PREREQ(2.50)
        !             4: 
        !             5: # The EILSEQ errno value ought to be defined in <errno.h>, according to
        !             6: # ISO C 99 and POSIX.  But some systems (like SunOS 4) don't define it,
        !             7: # and some systems (like BSD/OS) define it in <wchar.h> not <errno.h>.
        !             8: 
        !             9: # Define EILSEQ as a C macro and as a substituted macro in such a way that
        !            10: # 1. on all systems, after inclusion of <errno.h>, EILSEQ is usable,
        !            11: # 2. on systems where EILSEQ is defined elsewhere, we use the same numeric
        !            12: #    value.
        !            13: 
        !            14: AC_DEFUN([AC_EILSEQ],
        !            15: [
        !            16:   AC_REQUIRE([AC_PROG_CC])dnl
        !            17: 
        !            18:   dnl Check for any extra headers that could define EILSEQ.
        !            19:   AC_CHECK_HEADERS(wchar.h)
        !            20: 
        !            21:   AC_CACHE_CHECK([for EILSEQ], ac_cv_decl_EILSEQ, [
        !            22:     AC_EGREP_CPP(yes,[
        !            23: #include <errno.h>
        !            24: #ifdef EILSEQ
        !            25: yes
        !            26: #endif
        !            27:       ], have_eilseq=1)
        !            28:     if test -n "$have_eilseq"; then
        !            29:       dnl EILSEQ exists in <errno.h>. Don't need to define EILSEQ ourselves.
        !            30:       ac_cv_decl_EILSEQ=yes
        !            31:     else
        !            32:       AC_EGREP_CPP(yes,[
        !            33: #include <errno.h>
        !            34: #if HAVE_WCHAR_H
        !            35: #include <wchar.h>
        !            36: #endif
        !            37: #ifdef EILSEQ
        !            38: yes
        !            39: #endif
        !            40:         ], have_eilseq=1)
        !            41:       if test -n "$have_eilseq"; then
        !            42:         dnl EILSEQ exists in some other system header.
        !            43:         dnl Define it to the same value.
        !            44:         _AC_COMPUTE_INT([EILSEQ], ac_cv_decl_EILSEQ, [
        !            45: #include <errno.h>
        !            46: #if HAVE_WCHAR_H
        !            47: #include <wchar.h>
        !            48: #endif
        !            49: /* The following two lines are a workaround against an autoconf-2.52 bug.  */
        !            50: #include <stdio.h>
        !            51: #include <stdlib.h>
        !            52: ])
        !            53:       else
        !            54:         dnl EILSEQ isn't defined by the system. Define EILSEQ ourselves, but
        !            55:         dnl don't define it as EINVAL, because iconv() callers want to
        !            56:         dnl distinguish EINVAL and EILSEQ.
        !            57:         ac_cv_decl_EILSEQ=ENOENT
        !            58:       fi
        !            59:     fi
        !            60:   ])
        !            61:   if test "$ac_cv_decl_EILSEQ" != yes; then
        !            62:     AC_DEFINE_UNQUOTED([EILSEQ], [$ac_cv_decl_EILSEQ],
        !            63:                        [Define as good substitute value for EILSEQ.])
        !            64:     EILSEQ="$ac_cv_decl_EILSEQ"
        !            65:     AC_SUBST(EILSEQ)
        !            66:   fi
        !            67: ])