diff options
Diffstat (limited to 'm4/uchar_h.m4')
| -rw-r--r-- | m4/uchar_h.m4 | 249 |
1 files changed, 249 insertions, 0 deletions
diff --git a/m4/uchar_h.m4 b/m4/uchar_h.m4 new file mode 100644 index 0000000..abd4f51 --- /dev/null +++ b/m4/uchar_h.m4 @@ -0,0 +1,249 @@ +# 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]) +]) |