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-rw-r--r--m4/uchar_h.m4249
1 files changed, 249 insertions, 0 deletions
diff --git a/m4/uchar_h.m4 b/m4/uchar_h.m4
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+# uchar_h.m4 serial 31
+dnl Copyright (C) 2019-2024 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+dnl From Bruno Haible.
+dnl Prepare the overridden <uchar.h>.
+
+AC_DEFUN_ONCE([gl_UCHAR_H],
+[
+ AC_REQUIRE([gl_UCHAR_H_DEFAULTS])
+
+ gl_CHECK_NEXT_HEADERS([uchar.h])
+ if test $ac_cv_header_uchar_h = yes; then
+ HAVE_UCHAR_H=1
+ else
+ HAVE_UCHAR_H=0
+ fi
+ AC_SUBST([HAVE_UCHAR_H])
+
+ gl_TYPE_CHAR8_T
+ gl_TYPE_CHAR16_T
+ gl_TYPE_CHAR32_T
+
+ dnl In C++ mode, clang defines 'char16_t' and 'char32_t' as built-in types
+ dnl on some platforms (e.g. OpenBSD 6.7), and as types defined by many
+ dnl header files (<limits.h>, <stddef.h>, <stdint.h>, <stdio.h>, <stdlib.h>
+ dnl and others) on some platforms (e.g. Mac OS X 10.13).
+ dnl The same thing may also happen for 'char8_t'; so, be prepared for it.
+ m4_ifdef([gl_ANSI_CXX], [AC_REQUIRE([gl_ANSI_CXX])])
+ CXX_HAS_UCHAR_TYPES=0
+ if test $HAVE_UCHAR_H = 0; then
+ if test "$CXX" != no; then
+ AC_CACHE_CHECK([whether the C++ compiler predefines the <uchar.h> types],
+ [gl_cv_cxx_has_uchar_types],
+ [dnl We can't use AC_LANG_PUSH([C++]) and AC_LANG_POP([C++]) here, due to
+ dnl an autoconf bug <https://savannah.gnu.org/support/?110294>.
+ cat > conftest.cpp <<\EOF
+#include <stddef.h>
+char16_t a;
+char32_t b;
+EOF
+ gl_command="$CXX $CXXFLAGS $CPPFLAGS -c conftest.cpp"
+ if AC_TRY_EVAL([gl_command]); then
+ gl_cv_cxx_has_uchar_types=yes
+ else
+ gl_cv_cxx_has_uchar_types=no
+ fi
+ rm -fr conftest*
+ ])
+ if test $gl_cv_cxx_has_uchar_types = yes; then
+ CXX_HAS_UCHAR_TYPES=1
+ fi
+ fi
+ fi
+ AC_SUBST([CXX_HAS_UCHAR_TYPES])
+ CXX_HAS_CHAR8_TYPE=0
+ if test $HAVE_UCHAR_H = 0; then
+ if test "$CXX" != no; then
+ AC_CACHE_CHECK([whether the C++ compiler predefines the char8_t types],
+ [gl_cv_cxx_has_char8_type],
+ [dnl We can't use AC_LANG_PUSH([C++]) and AC_LANG_POP([C++]) here, due to
+ dnl an autoconf bug <https://savannah.gnu.org/support/?110294>.
+ cat > conftest.cpp <<\EOF
+#include <stddef.h>
+char8_t a;
+EOF
+ gl_command="$CXX $CXXFLAGS $CPPFLAGS -c conftest.cpp"
+ if AC_TRY_EVAL([gl_command]); then
+ gl_cv_cxx_has_char8_type=yes
+ else
+ gl_cv_cxx_has_char8_type=no
+ fi
+ rm -fr conftest*
+ ])
+ if test $gl_cv_cxx_has_char8_type = yes; then
+ CXX_HAS_CHAR8_TYPE=1
+ fi
+ fi
+ fi
+ AC_SUBST([CXX_HAS_CHAR8_TYPE])
+
+ dnl Test whether a 'char32_t' can hold more characters than a 'wchar_t'.
+ gl_STDINT_BITSIZEOF([wchar_t], [gl_STDINT_INCLUDES])
+ if test $BITSIZEOF_WCHAR_T -lt 32; then
+ SMALL_WCHAR_T=1
+ else
+ SMALL_WCHAR_T=0
+ fi
+ dnl SMALL_WCHAR_T is expected to be 1 on 32-bit AIX, Cygwin, native Windows.
+ AC_SUBST([SMALL_WCHAR_T])
+
+ dnl Check for declarations of anything we want to poison if the
+ dnl corresponding gnulib module is not in use, and which is not
+ dnl guaranteed by C11.
+ gl_WARN_ON_USE_PREPARE([[
+ #ifdef __HAIKU__
+ #include <stdint.h>
+ #endif
+ #include <uchar.h>
+ ]], [c32rtomb mbrtoc16 mbrtoc32])
+])
+
+AC_DEFUN_ONCE([gl_TYPE_CHAR8_T],
+[
+ dnl Determine whether gnulib's <uchar.h> would, if present, override char8_t.
+ AC_CACHE_CHECK([whether char8_t is correctly defined],
+ [gl_cv_type_char8_t_works],
+ [AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM([[
+ #ifdef __HAIKU__
+ #include <stdint.h>
+ #endif
+ #include <uchar.h>
+ int verify[(char8_t)(-1) >= 0 && sizeof (char8_t) == sizeof (unsigned char) ? 1 : -1];
+ ]])
+ ],
+ [gl_cv_type_char8_t_works=yes],
+ [gl_cv_type_char8_t_works=no])
+ ])
+ if test $gl_cv_type_char8_t_works = no; then
+ GNULIBHEADERS_OVERRIDE_CHAR8_T=1
+ else
+ GNULIBHEADERS_OVERRIDE_CHAR8_T=0
+ fi
+ AC_SUBST([GNULIBHEADERS_OVERRIDE_CHAR8_T])
+])
+
+dnl On Haiku 2020, char16_t and char32_t are incorrectly defined.
+dnl See <https://dev.haiku-os.org/ticket/15990>.
+AC_DEFUN_ONCE([gl_TYPE_CHAR16_T],
+[
+ dnl Determine whether gnulib's <uchar.h> would, if present, override char16_t.
+ AC_CACHE_CHECK([whether char16_t is correctly defined],
+ [gl_cv_type_char16_t_works],
+ [AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM([[
+ #ifdef __HAIKU__
+ #include <stdint.h>
+ #endif
+ #include <uchar.h>
+ /* For simplicity, assume that uint16_least_t is equivalent to
+ 'unsigned short'. */
+ int verify[(char16_t)(-1) >= 0 && sizeof (char16_t) == sizeof (unsigned short) ? 1 : -1];
+ ]])
+ ],
+ [gl_cv_type_char16_t_works=yes],
+ [gl_cv_type_char16_t_works=no])
+ ])
+ if test $gl_cv_type_char16_t_works = no; then
+ GNULIBHEADERS_OVERRIDE_CHAR16_T=1
+ else
+ GNULIBHEADERS_OVERRIDE_CHAR16_T=0
+ fi
+ AC_SUBST([GNULIBHEADERS_OVERRIDE_CHAR16_T])
+])
+AC_DEFUN_ONCE([gl_TYPE_CHAR32_T],
+[
+ dnl Determine whether gnulib's <uchar.h> would, if present, override char32_t.
+ AC_CACHE_CHECK([whether char32_t is correctly defined],
+ [gl_cv_type_char32_t_works],
+ [AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM([[
+ #ifdef __HAIKU__
+ #include <stdint.h>
+ #endif
+ #include <uchar.h>
+ /* For simplicity, assume that uint32_least_t is equivalent to
+ 'unsigned int'. */
+ int verify[(char32_t)(-1) >= 0 && sizeof (char32_t) == sizeof (unsigned int) ? 1 : -1];
+ ]])
+ ],
+ [gl_cv_type_char32_t_works=yes],
+ [gl_cv_type_char32_t_works=no])
+ ])
+ if test $gl_cv_type_char32_t_works = no; then
+ GNULIBHEADERS_OVERRIDE_CHAR32_T=1
+ else
+ GNULIBHEADERS_OVERRIDE_CHAR32_T=0
+ fi
+ AC_SUBST([GNULIBHEADERS_OVERRIDE_CHAR32_T])
+])
+
+# gl_UCHAR_MODULE_INDICATOR([modulename])
+# sets the shell variable that indicates the presence of the given module
+# to a C preprocessor expression that will evaluate to 1.
+# This macro invocation must not occur in macros that are AC_REQUIREd.
+AC_DEFUN([gl_UCHAR_MODULE_INDICATOR],
+[
+ dnl Ensure to expand the default settings once only.
+ gl_UCHAR_H_REQUIRE_DEFAULTS
+ gl_MODULE_INDICATOR_SET_VARIABLE([$1])
+ dnl Define it also as a C macro, for the benefit of the unit tests.
+ gl_MODULE_INDICATOR_FOR_TESTS([$1])
+])
+
+# Initializes the default values for AC_SUBSTed shell variables.
+# This macro must not be AC_REQUIREd. It must only be invoked, and only
+# outside of macros or in macros that are not AC_REQUIREd.
+AC_DEFUN([gl_UCHAR_H_REQUIRE_DEFAULTS],
+[
+ m4_defun(GL_MODULE_INDICATOR_PREFIX[_UCHAR_H_MODULE_INDICATOR_DEFAULTS], [
+ gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_BTOC32])
+ gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_C32ISALNUM])
+ gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_C32ISALPHA])
+ gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_C32ISBLANK])
+ gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_C32ISCNTRL])
+ gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_C32ISDIGIT])
+ gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_C32ISGRAPH])
+ gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_C32ISLOWER])
+ gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_C32ISPRINT])
+ gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_C32ISPUNCT])
+ gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_C32ISSPACE])
+ gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_C32ISUPPER])
+ gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_C32ISXDIGIT])
+ gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_C32TOLOWER])
+ gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_C32TOUPPER])
+ gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_C32WIDTH])
+ gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_C32RTOMB])
+ gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_C32SNRTOMBS])
+ gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_C32SRTOMBS])
+ gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_C32STOMBS])
+ gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_C32SWIDTH])
+ gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_C32TOB])
+ gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_C32_APPLY_MAPPING])
+ gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_C32_APPLY_TYPE_TEST])
+ gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_C32_GET_MAPPING])
+ gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_C32_GET_TYPE_TEST])
+ gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MBRTOC16])
+ gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MBRTOC32])
+ gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MBSNRTOC32S])
+ gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MBSRTOC32S])
+ gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MBSTOC32S])
+ ])
+ m4_require(GL_MODULE_INDICATOR_PREFIX[_UCHAR_H_MODULE_INDICATOR_DEFAULTS])
+ AC_REQUIRE([gl_UCHAR_H_DEFAULTS])
+])
+
+AC_DEFUN([gl_UCHAR_H_DEFAULTS],
+[
+ dnl Assume proper GNU behavior unless another module says otherwise.
+ HAVE_C32RTOMB=1; AC_SUBST([HAVE_C32RTOMB])
+ HAVE_MBRTOC16=1; AC_SUBST([HAVE_MBRTOC16])
+ HAVE_MBRTOC32=1; AC_SUBST([HAVE_MBRTOC32])
+ REPLACE_C32RTOMB=0; AC_SUBST([REPLACE_C32RTOMB])
+ REPLACE_MBRTOC16=0; AC_SUBST([REPLACE_MBRTOC16])
+ REPLACE_MBRTOC32=0; AC_SUBST([REPLACE_MBRTOC32])
+])