diff options
Diffstat (limited to 'm4/c32rtomb.m4')
| -rw-r--r-- | m4/c32rtomb.m4 | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/m4/c32rtomb.m4 b/m4/c32rtomb.m4 new file mode 100644 index 0000000000..4cf0e4deda --- /dev/null +++ b/m4/c32rtomb.m4 @@ -0,0 +1,55 @@ +# c32rtomb.m4 serial 1 +dnl Copyright (C) 2020 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_C32RTOMB], +[ + AC_REQUIRE([gl_UCHAR_H_DEFAULTS]) + + AC_REQUIRE([gl_MBRTOC32_SANITYCHECK]) + + AC_CHECK_FUNCS_ONCE([c32rtomb]) + if test $ac_cv_func_c32rtomb = no; then + HAVE_C32RTOMB=0 + else + dnl When we override mbrtoc32, redefining the meaning of the char32_t + dnl values, we need to override c32rtomb as well, for consistency. + if test $HAVE_WORKING_MBRTOC32 = 0; then + REPLACE_C32RTOMB=1 + fi + AC_CACHE_CHECK([whether c32rtomb return value is correct], + [gl_cv_func_c32rtomb_retval], + [ + dnl Initial guess, used when cross-compiling. +changequote(,)dnl + case "$host_os" in + # Guess no on AIX. + aix*) gl_cv_func_c32rtomb_retval="guessing no" ;; + # Guess yes otherwise. + *) gl_cv_func_c32rtomb_retval="guessing yes" ;; + esac +changequote([,])dnl + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ +#include <uchar.h> +int main () +{ + int result = 0; + if (c32rtomb (NULL, 0, NULL) != 1) + result |= 1; + return result; +}]])], + [gl_cv_func_c32rtomb_retval=yes], + [gl_cv_func_c32rtomb_retval=no], + [:]) + ]) + case "$gl_cv_func_c32rtomb_retval" in + *yes) ;; + *) AC_DEFINE([C32RTOMB_RETVAL_BUG], [1], + [Define if the wcrtomb function has an incorrect return value.]) + REPLACE_C32RTOMB=1 ;; + esac + fi +]) |