257 lines
11 KiB
Text
257 lines
11 KiB
Text
dnl A placeholder for ISO C99 <wchar.h>, for platforms that have issues.
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dnl Copyright (C) 2007-2023 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 55
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AC_DEFUN_ONCE([gl_WCHAR_H],
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[
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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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gl_CHECK_NEXT_HEADERS([wchar.h])
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if test $ac_cv_header_wchar_h = yes; then
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HAVE_WCHAR_H=1
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else
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HAVE_WCHAR_H=0
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fi
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AC_SUBST([HAVE_WCHAR_H])
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AC_REQUIRE([gl_FEATURES_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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HAVE_WINT_T=1
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else
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HAVE_WINT_T=0
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fi
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AC_SUBST([HAVE_WINT_T])
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AC_REQUIRE([gl_TYPE_WINT_T_PREREQ])
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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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#include <wchar.h>
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]],
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[btowc wctob mbsinit mbrtowc mbrlen mbsrtowcs mbsnrtowcs wcrtomb
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wcsrtombs wcsnrtombs wcwidth
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wmemchr wmemcmp wmemcpy wmemmove wmempcpy wmemset
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wcslen wcsnlen wcscpy wcpcpy wcsncpy wcpncpy wcscat wcsncat wcscmp
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wcsncmp wcscasecmp wcsncasecmp wcscoll wcsxfrm wcsdup wcschr wcsrchr
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wcscspn wcsspn wcspbrk wcsstr wcstok wcswidth wcsftime
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])
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AC_REQUIRE([AC_C_RESTRICT])
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AC_CHECK_DECLS([wcsdup], [], [], [[
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#include <wchar.h>
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]])
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if test $ac_cv_have_decl_wcsdup = no; then
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HAVE_DECL_WCSDUP=0
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fi
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])
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dnl Check whether <wchar.h> is usable at all.
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AC_DEFUN([gl_WCHAR_H_INLINE_OK],
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[
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dnl Test whether <wchar.h> suffers due to the transition from '__inline' to
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dnl 'gnu_inline'. See <https://sourceware.org/bugzilla/show_bug.cgi?id=4022>
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dnl and <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=42440>. In summary,
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dnl glibc version 2.5 or older, together with gcc version 4.3 or newer and
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dnl the option -std=c99 or -std=gnu99, leads to a broken <wchar.h>.
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AC_REQUIRE([AC_CANONICAL_HOST])
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AC_CACHE_CHECK([whether <wchar.h> uses 'inline' correctly],
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[gl_cv_header_wchar_h_correct_inline],
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[gl_cv_header_wchar_h_correct_inline=yes
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case "$host_os" in
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*-gnu* | gnu*)
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AC_LANG_CONFTEST([
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AC_LANG_SOURCE([[
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#define wcstod renamed_wcstod
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#include <wchar.h>
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extern int zero (void);
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int main () { return zero(); }
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]])])
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dnl Do not rename the object file from conftest.$ac_objext to
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dnl conftest1.$ac_objext, as this will cause the link to fail on
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dnl z/OS when using the XPLINK object format (due to duplicate
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dnl CSECT names). Instead, temporarily redefine $ac_compile so
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dnl that the object file has the latter name from the start.
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save_ac_compile="$ac_compile"
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ac_compile=`echo "$save_ac_compile" | sed s/conftest/conftest1/`
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if echo '#include "conftest.c"' >conftest1.c \
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&& AC_TRY_EVAL([ac_compile]); then
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AC_LANG_CONFTEST([
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AC_LANG_SOURCE([[
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#define wcstod renamed_wcstod
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#include <wchar.h>
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int zero (void) { return 0; }
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]])])
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dnl See note above about renaming object files.
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ac_compile=`echo "$save_ac_compile" | sed s/conftest/conftest2/`
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if echo '#include "conftest.c"' >conftest2.c \
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&& AC_TRY_EVAL([ac_compile]); then
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if $CC -o conftest$ac_exeext $CFLAGS $LDFLAGS conftest1.$ac_objext conftest2.$ac_objext $LIBS >&AS_MESSAGE_LOG_FD 2>&1; then
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:
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else
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gl_cv_header_wchar_h_correct_inline=no
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fi
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fi
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fi
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ac_compile="$save_ac_compile"
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rm -f conftest[12].c conftest[12].$ac_objext conftest$ac_exeext
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;;
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esac
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])
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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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<https://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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fi
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])
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# gl_WCHAR_MODULE_INDICATOR([modulename])
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# sets the shell variable that indicates the presence of the given module
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# to a C preprocessor expression that will evaluate to 1.
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# This macro invocation must not occur in macros that are AC_REQUIREd.
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AC_DEFUN([gl_WCHAR_MODULE_INDICATOR],
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[
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dnl Ensure to expand the default settings once only.
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gl_WCHAR_H_REQUIRE_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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])
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# Initializes the default values for AC_SUBSTed shell variables.
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# This macro must not be AC_REQUIREd. It must only be invoked, and only
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# outside of macros or in macros that are not AC_REQUIREd.
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AC_DEFUN([gl_WCHAR_H_REQUIRE_DEFAULTS],
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[
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m4_defun(GL_MODULE_INDICATOR_PREFIX[_WCHAR_H_MODULE_INDICATOR_DEFAULTS], [
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_BTOWC])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCTOB])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MBSINIT])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MBRTOWC])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MBRLEN])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MBSRTOWCS])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MBSNRTOWCS])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCRTOMB])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSRTOMBS])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSNRTOMBS])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCWIDTH])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WMEMCHR])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WMEMCMP])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WMEMCPY])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WMEMMOVE])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WMEMPCPY])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WMEMSET])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSLEN])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSNLEN])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSCPY])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCPCPY])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSNCPY])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCPNCPY])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSCAT])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSNCAT])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSCMP])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSNCMP])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSCASECMP])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSNCASECMP])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSCOLL])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSXFRM])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSDUP])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSCHR])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSRCHR])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSCSPN])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSSPN])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSPBRK])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSSTR])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSTOK])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSWIDTH])
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WCSFTIME])
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dnl Support Microsoft deprecated alias function names by default.
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_WCSDUP], [1])
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])
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m4_require(GL_MODULE_INDICATOR_PREFIX[_WCHAR_H_MODULE_INDICATOR_DEFAULTS])
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dnl Make sure the shell variable for GNULIB_FREE_POSIX is initialized.
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gl_STDLIB_H_REQUIRE_DEFAULTS
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AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
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])
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AC_DEFUN([gl_WCHAR_H_DEFAULTS],
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[
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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_WMEMCHR=1; AC_SUBST([HAVE_WMEMCHR])
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HAVE_WMEMCMP=1; AC_SUBST([HAVE_WMEMCMP])
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HAVE_WMEMCPY=1; AC_SUBST([HAVE_WMEMCPY])
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HAVE_WMEMMOVE=1; AC_SUBST([HAVE_WMEMMOVE])
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HAVE_WMEMPCPY=1; AC_SUBST([HAVE_WMEMPCPY])
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HAVE_WMEMSET=1; AC_SUBST([HAVE_WMEMSET])
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HAVE_WCSLEN=1; AC_SUBST([HAVE_WCSLEN])
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HAVE_WCSNLEN=1; AC_SUBST([HAVE_WCSNLEN])
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HAVE_WCSCPY=1; AC_SUBST([HAVE_WCSCPY])
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HAVE_WCPCPY=1; AC_SUBST([HAVE_WCPCPY])
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HAVE_WCSNCPY=1; AC_SUBST([HAVE_WCSNCPY])
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HAVE_WCPNCPY=1; AC_SUBST([HAVE_WCPNCPY])
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HAVE_WCSCAT=1; AC_SUBST([HAVE_WCSCAT])
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HAVE_WCSNCAT=1; AC_SUBST([HAVE_WCSNCAT])
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HAVE_WCSCMP=1; AC_SUBST([HAVE_WCSCMP])
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HAVE_WCSNCMP=1; AC_SUBST([HAVE_WCSNCMP])
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HAVE_WCSCASECMP=1; AC_SUBST([HAVE_WCSCASECMP])
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HAVE_WCSNCASECMP=1; AC_SUBST([HAVE_WCSNCASECMP])
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HAVE_WCSCOLL=1; AC_SUBST([HAVE_WCSCOLL])
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HAVE_WCSXFRM=1; AC_SUBST([HAVE_WCSXFRM])
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HAVE_WCSDUP=1; AC_SUBST([HAVE_WCSDUP])
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HAVE_WCSCHR=1; AC_SUBST([HAVE_WCSCHR])
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HAVE_WCSRCHR=1; AC_SUBST([HAVE_WCSRCHR])
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HAVE_WCSCSPN=1; AC_SUBST([HAVE_WCSCSPN])
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HAVE_WCSSPN=1; AC_SUBST([HAVE_WCSSPN])
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HAVE_WCSPBRK=1; AC_SUBST([HAVE_WCSPBRK])
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HAVE_WCSSTR=1; AC_SUBST([HAVE_WCSSTR])
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HAVE_WCSTOK=1; AC_SUBST([HAVE_WCSTOK])
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HAVE_WCSWIDTH=1; AC_SUBST([HAVE_WCSWIDTH])
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HAVE_WCSFTIME=1; AC_SUBST([HAVE_WCSFTIME])
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HAVE_DECL_WCTOB=1; AC_SUBST([HAVE_DECL_WCTOB])
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HAVE_DECL_WCSDUP=1; AC_SUBST([HAVE_DECL_WCSDUP])
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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])
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REPLACE_WCSWIDTH=0; AC_SUBST([REPLACE_WCSWIDTH])
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REPLACE_WCSFTIME=0; AC_SUBST([REPLACE_WCSFTIME])
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REPLACE_WCSTOK=0; AC_SUBST([REPLACE_WCSTOK])
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])
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