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-rw-r--r--m4/wcwidth.m4115
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diff --git a/m4/wcwidth.m4 b/m4/wcwidth.m4
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+# wcwidth.m4 serial 36
+dnl Copyright (C) 2006-2023 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.
+
+AC_DEFUN([gl_FUNC_WCWIDTH],
+[
+ AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+
+ dnl Persuade glibc <wchar.h> to declare wcwidth().
+ AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
+
+ AC_REQUIRE([gt_TYPE_WCHAR_T])
+ AC_REQUIRE([gt_TYPE_WINT_T])
+
+ AC_CHECK_HEADERS_ONCE([wchar.h])
+ AC_CHECK_FUNCS_ONCE([wcwidth])
+
+ AC_CHECK_DECLS([wcwidth], [], [], [[
+ #include <wchar.h>
+ ]])
+ if test $ac_cv_have_decl_wcwidth != yes; then
+ HAVE_DECL_WCWIDTH=0
+ fi
+
+ if test $ac_cv_func_wcwidth != yes; then
+ AC_CACHE_CHECK([whether wcwidth is a macro],
+ [gl_cv_func_wcwidth_macro],
+ [AC_EGREP_CPP([wchar_header_defines_wcwidth], [
+#include <wchar.h>
+#ifdef wcwidth
+ wchar_header_defines_wcwidth
+#endif],
+ [gl_cv_func_wcwidth_macro=yes],
+ [gl_cv_func_wcwidth_macro=no])
+ ])
+ fi
+
+ if test $ac_cv_func_wcwidth = yes || test $gl_cv_func_wcwidth_macro = yes; then
+ HAVE_WCWIDTH=1
+ dnl On Mac OS X 10.3, wcwidth(0x0301) (COMBINING ACUTE ACCENT) returns 1.
+ dnl On macOS 12.5, NetBSD 9.0, OpenBSD 5.0, MidnightBSD 1.1,
+ dnl wcwidth(0x05B0) (HEBREW POINT SHEVA) returns 1.
+ dnl On macOS 12.5, NetBSD 9.0, MidnightBSD 1.1, OSF/1 5.1,
+ dnl wcwidth(0x200B) (ZERO WIDTH SPACE) returns 1.
+ dnl On OpenBSD 5.8, wcwidth(0xFF1A) (FULLWIDTH COLON) returns 0.
+ dnl This leads to bugs in 'ls' (coreutils).
+ dnl On Solaris 11.4, wcwidth(0x2202) (PARTIAL DIFFERENTIAL) returns 2,
+ dnl even in Western locales.
+ AC_CACHE_CHECK([whether wcwidth works reasonably in UTF-8 locales],
+ [gl_cv_func_wcwidth_works],
+ [
+ AC_RUN_IFELSE(
+ [AC_LANG_SOURCE([[
+#include <locale.h>
+#include <wchar.h>
+#if !HAVE_DECL_WCWIDTH
+extern
+# ifdef __cplusplus
+"C"
+# endif
+int wcwidth (int);
+#endif
+int main ()
+{
+ int result = 0;
+ if (setlocale (LC_ALL, "en_US.UTF-8") != NULL)
+ {
+ if (wcwidth (0x0301) > 0)
+ result |= 1;
+ if (wcwidth (0x05B0) > 0)
+ result |= 2;
+ if (wcwidth (0x200B) > 0)
+ result |= 4;
+ if (wcwidth (0xFF1A) == 0)
+ result |= 8;
+ if (wcwidth (0x2202) > 1)
+ result |= 16;
+ }
+ return result;
+}]])],
+ [gl_cv_func_wcwidth_works=yes],
+ [gl_cv_func_wcwidth_works=no],
+ [
+changequote(,)dnl
+ case "$host_os" in
+ # Guess yes on glibc systems.
+ *-gnu* | gnu*) gl_cv_func_wcwidth_works="guessing yes";;
+ # Guess yes on musl systems.
+ *-musl* | midipix*) gl_cv_func_wcwidth_works="guessing yes";;
+ # Guess yes on AIX 7 systems.
+ aix[7-9]*) gl_cv_func_wcwidth_works="guessing yes";;
+ *) gl_cv_func_wcwidth_works="$gl_cross_guess_normal";;
+ esac
+changequote([,])dnl
+ ])
+ ])
+ case "$gl_cv_func_wcwidth_works" in
+ *yes) ;;
+ *no) REPLACE_WCWIDTH=1 ;;
+ esac
+ else
+ HAVE_WCWIDTH=0
+ fi
+ dnl We don't substitute HAVE_WCWIDTH. We assume that if the system does not
+ dnl have the wcwidth function, then it does not declare it.
+])
+
+# Prerequisites of lib/wcwidth.c.
+AC_DEFUN([gl_PREREQ_WCWIDTH], [
+ AC_REQUIRE([AC_C_INLINE])
+ :
+])