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dnl A placeholder for ISO C99 <wchar.h>, for platforms that have issues.
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dnl Copyright (C) 2007-2010 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 Written by Eric Blake.
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# wchar_h.m4 serial 33
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AC_DEFUN([gl_WCHAR_H],
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AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
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AC_REQUIRE([gl_WCHAR_H_INLINE_OK])
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dnl Prepare for creating substitute <wchar.h>.
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dnl Check for <wchar.h> (missing in Linux uClibc when built without wide
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dnl character support).
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dnl <wchar.h> is always overridden, because of GNULIB_POSIXCHECK.
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AC_CHECK_HEADERS_ONCE([wchar.h])
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gl_CHECK_NEXT_HEADERS([wchar.h])
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if test $ac_cv_header_wchar_h = yes; then
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AC_SUBST([HAVE_WCHAR_H])
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AC_REQUIRE([gt_TYPE_WINT_T])
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if test $gt_cv_c_wint_t = yes; then
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AC_SUBST([HAVE_WINT_T])
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dnl Check for declarations of anything we want to poison if the
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dnl corresponding gnulib module is not in use.
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gl_WARN_ON_USE_PREPARE([[
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/* Some systems require additional headers. */
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]], [btowc wctob mbsinit mbrtowc mbrlen mbsrtowcs mbsnrtowcs wcrtomb
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wcsrtombs wcsnrtombs wcwidth])
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dnl Check whether <wchar.h> is usable at all.
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AC_DEFUN([gl_WCHAR_H_INLINE_OK],
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dnl Test whether <wchar.h> suffers due to the transition from '__inline' to
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dnl 'gnu_inline'. See <http://sourceware.org/bugzilla/show_bug.cgi?id=4022>
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dnl and <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42440>. In summary,
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dnl glibc version 2.5 or older, together with gcc version 4.3 or newer and
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dnl the option -std=c99 or -std=gnu99, leads to a broken <wchar.h>.
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AC_CACHE_CHECK([whether <wchar.h> uses 'inline' correctly],
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[gl_cv_header_wchar_h_correct_inline],
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[gl_cv_header_wchar_h_correct_inline=yes
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AC_LANG_SOURCE([[#define wcstod renamed_wcstod
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extern int zero (void);
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int main () { return zero(); }
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if AC_TRY_EVAL([ac_compile]); then
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mv conftest.$ac_objext conftest1.$ac_objext
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AC_LANG_SOURCE([[#define wcstod renamed_wcstod
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int zero (void) { return 0; }
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if AC_TRY_EVAL([ac_compile]); then
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mv conftest.$ac_objext conftest2.$ac_objext
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if $CC -o conftest$ac_exeext $CFLAGS $LDFLAGS conftest1.$ac_objext conftest2.$ac_objext $LIBS >&AS_MESSAGE_LOG_FD 2>&1; then
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gl_cv_header_wchar_h_correct_inline=no
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rm -f conftest1.$ac_objext conftest2.$ac_objext conftest$ac_exeext
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if test $gl_cv_header_wchar_h_correct_inline = no; then
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AC_MSG_ERROR([<wchar.h> cannot be used with this compiler ($CC $CFLAGS $CPPFLAGS).
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This is a known interoperability problem of glibc <= 2.5 with gcc >= 4.3 in
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C99 mode. You have four options:
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- Add the flag -fgnu89-inline to CC and reconfigure, or
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- Fix your include files, using parts of
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<http://sourceware.org/git/?p=glibc.git;a=commitdiff;h=b037a293a48718af30d706c2e18c929d0e69a621>, or
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- Use a gcc version older than 4.3, or
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- Don't use the flags -std=c99 or -std=gnu99.
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Configuration aborted.])
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dnl Unconditionally enables the replacement of <wchar.h>.
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AC_DEFUN([gl_REPLACE_WCHAR_H],
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dnl This is a no-op, because <wchar.h> is always overridden.
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AC_DEFUN([gl_WCHAR_MODULE_INDICATOR],
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dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
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AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
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gl_MODULE_INDICATOR_SET_VARIABLE([$1])
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dnl Define it also as a C macro, for the benefit of the unit tests.
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gl_MODULE_INDICATOR_FOR_TESTS([$1])
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AC_DEFUN([gl_WCHAR_H_DEFAULTS],
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GNULIB_BTOWC=0; AC_SUBST([GNULIB_BTOWC])
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GNULIB_WCTOB=0; AC_SUBST([GNULIB_WCTOB])
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GNULIB_MBSINIT=0; AC_SUBST([GNULIB_MBSINIT])
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GNULIB_MBRTOWC=0; AC_SUBST([GNULIB_MBRTOWC])
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GNULIB_MBRLEN=0; AC_SUBST([GNULIB_MBRLEN])
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GNULIB_MBSRTOWCS=0; AC_SUBST([GNULIB_MBSRTOWCS])
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GNULIB_MBSNRTOWCS=0; AC_SUBST([GNULIB_MBSNRTOWCS])
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GNULIB_WCRTOMB=0; AC_SUBST([GNULIB_WCRTOMB])
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GNULIB_WCSRTOMBS=0; AC_SUBST([GNULIB_WCSRTOMBS])
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GNULIB_WCSNRTOMBS=0; AC_SUBST([GNULIB_WCSNRTOMBS])
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GNULIB_WCWIDTH=0; AC_SUBST([GNULIB_WCWIDTH])
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dnl Assume proper GNU behavior unless another module says otherwise.
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HAVE_BTOWC=1; AC_SUBST([HAVE_BTOWC])
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HAVE_MBSINIT=1; AC_SUBST([HAVE_MBSINIT])
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HAVE_MBRTOWC=1; AC_SUBST([HAVE_MBRTOWC])
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HAVE_MBRLEN=1; AC_SUBST([HAVE_MBRLEN])
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HAVE_MBSRTOWCS=1; AC_SUBST([HAVE_MBSRTOWCS])
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HAVE_MBSNRTOWCS=1; AC_SUBST([HAVE_MBSNRTOWCS])
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HAVE_WCRTOMB=1; AC_SUBST([HAVE_WCRTOMB])
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HAVE_WCSRTOMBS=1; AC_SUBST([HAVE_WCSRTOMBS])
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HAVE_WCSNRTOMBS=1; AC_SUBST([HAVE_WCSNRTOMBS])
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HAVE_DECL_WCTOB=1; AC_SUBST([HAVE_DECL_WCTOB])
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HAVE_DECL_WCWIDTH=1; AC_SUBST([HAVE_DECL_WCWIDTH])
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REPLACE_MBSTATE_T=0; AC_SUBST([REPLACE_MBSTATE_T])
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REPLACE_BTOWC=0; AC_SUBST([REPLACE_BTOWC])
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REPLACE_WCTOB=0; AC_SUBST([REPLACE_WCTOB])
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REPLACE_MBSINIT=0; AC_SUBST([REPLACE_MBSINIT])
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REPLACE_MBRTOWC=0; AC_SUBST([REPLACE_MBRTOWC])
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REPLACE_MBRLEN=0; AC_SUBST([REPLACE_MBRLEN])
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REPLACE_MBSRTOWCS=0; AC_SUBST([REPLACE_MBSRTOWCS])
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REPLACE_MBSNRTOWCS=0; AC_SUBST([REPLACE_MBSNRTOWCS])
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REPLACE_WCRTOMB=0; AC_SUBST([REPLACE_WCRTOMB])
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REPLACE_WCSRTOMBS=0; AC_SUBST([REPLACE_WCSRTOMBS])
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REPLACE_WCSNRTOMBS=0; AC_SUBST([REPLACE_WCSNRTOMBS])
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REPLACE_WCWIDTH=0; AC_SUBST([REPLACE_WCWIDTH])