From 91635e212543d071fdf5035a72120e98e9ec4dda Mon Sep 17 00:00:00 2001
From: Michael Wallner <mike@php.net>
Date: Fri, 15 Apr 2016 11:38:44 +0200
Subject: [PATCH] configure: improve detection of wchar_t

---
 m4/stddef.m4 | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/m4/stddef.m4 b/m4/stddef.m4
index b6ee82e..fd52d2a 100644
--- a/m4/stddef.m4
+++ b/m4/stddef.m4
@@ -6,6 +6,13 @@ PSI_CHECK_STDDEF() {
     PSI_TYPE(size_t, uint)
     PSI_CONST(SIZE_MAX, int)
     PSI_TYPE(wchar_t, int)
+    if PSI_SH_TEST_SIZEOF(wchar_t); then :; else
+    	# some platforms fail to provide wchar_t in stddef.h
+    	unset ac_cv_sizeof_wchar_t
+    	unset ax_cv_decl_wchar_t_signed
+    	AC_CHECK_HEADERS(wchar.h)
+    	PSI_TYPE(wchar_t, int)
+    fi
     PSI_CONST(WCHAR_MIN, int)
     PSI_CONST(WCHAR_MAX, int)
 }
-- 
2.30.2