From 8d6ba35827bc4025a39acace8b65f2de96613a8a Mon Sep 17 00:00:00 2001
From: Peter Wu <peter@lekensteyn.nl>
Date: Thu, 30 Oct 2014 18:49:09 +0100
Subject: [PATCH] CheckStructHasMember: Avoid clang -Wall breakage (#15203)

With CMAKE_C_COMPILER=clang and CMAKE_C_FLAGS='-Wall -Werror', this test
breaks with -Werror,-Wuninitialized.  Fix this by getting rid of the
temporary variable.
---
 Modules/CheckStructHasMember.cmake | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/Modules/CheckStructHasMember.cmake b/Modules/CheckStructHasMember.cmake
index c8949cf26..de31d2ce2 100644
--- a/Modules/CheckStructHasMember.cmake
+++ b/Modules/CheckStructHasMember.cmake
@@ -69,8 +69,7 @@ macro (CHECK_STRUCT_HAS_MEMBER _STRUCT _MEMBER _HEADER _RESULT)
 ${_INCLUDE_FILES}
 int main()
 {
-   ${_STRUCT}* tmp;
-   (void) tmp->${_MEMBER};
+   (void)((${_STRUCT} *)0)->${_MEMBER};
    return 0;
 }
 ")