+2024-06-17 Bruno Haible <bruno@clisp.org>
+
+ vasnprintf: Fix test failure on Cygwin.
+ * m4/vasnprintf.m4 (gl_FUNC_VASNPRINTF): Require AC_CANONICAL_HOST. Test
+ whether vasnprintf works reliably; invoke gl_REPLACE_VASNPRINTF if not.
+
2024-06-17 Bruno Haible <bruno@clisp.org>
nstrftime, c-nstrftime: Fix crash on Solaris 11.4.
# vasnprintf.m4
-# serial 53
+# serial 54
dnl Copyright (C) 2002-2004, 2006-2024 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
AC_DEFUN([gl_FUNC_VASNPRINTF],
[
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CHECK_FUNCS_ONCE([vasnprintf])
- if test $ac_cv_func_vasnprintf = no; then
+ if test $ac_cv_func_vasnprintf = yes; then
+ dnl On Cygwin, in directives with a huge width, the width is ignored, and
+ dnl the function returns a wrong result.
+ AC_CACHE_CHECK([whether vasnprintf works],
+ [gl_cv_func_vasnprintf_works],
+ [AC_RUN_IFELSE(
+ [AC_LANG_SOURCE(
+ [[#include <stdio.h>
+ ]],
+ [[size_t len;
+ char *res = vasnprintf (NULL, &len, "x%03000000000dy\n", -17);
+ /* On Cygwin 3.4.6, res is "x-17y\n" and len == 6: wrong. */
+ return (res != NULL && len < 10);
+ ]])
+ ],
+ [gl_cv_func_vasnprintf_works=yes],
+ [gl_cv_func_vasnprintf_works=no],
+ [case "$host_os" in
+ # Guess no on Cygwin.
+ cygwin*) gl_cv_func_vasnprintf_works="guessing no";;
+ # If we don't know, obey --enable-cross-guesses.
+ *) gl_cv_func_vasnprintf_works="$gl_cross_guess_normal";;
+ esac
+ ])
+ ])
+ fi
+ if test $ac_cv_func_vasnprintf != yes \
+ || case "$gl_cv_func_vasnprintf_works" in
+ *yes) false;;
+ *) true;;
+ esac
+ then
gl_REPLACE_VASNPRINTF
fi
])