- AC_CACHE_CHECK([whether <wchar.h> is standalone],
- [gl_cv_header_wchar_h_standalone],
- [AC_COMPILE_IFELSE([[#include <wchar.h>
-wchar_t w;]],
- [gl_cv_header_wchar_h_standalone=yes],
- [gl_cv_header_wchar_h_standalone=no])])
-
- AC_REQUIRE([gt_TYPE_WINT_T])
- if test $gt_cv_c_wint_t = yes; then
- HAVE_WINT_T=1
- else
- HAVE_WINT_T=0
- fi
- AC_SUBST([HAVE_WINT_T])
-
- dnl If <stddef.h> is replaced, then <wchar.h> must also be replaced.
- AC_REQUIRE([gl_STDDEF_H])
-
- if test $gl_cv_header_wchar_h_standalone != yes || test $gt_cv_c_wint_t != yes || test -n "$STDDEF_H"; then
- WCHAR_H=wchar.h
- fi
-