From 8512db2a1b2bacb8b142109f3e177a3f14d6ca6f Mon Sep 17 00:00:00 2001
From: Chris Bieneman <beanz@apple.com>
Date: Wed, 11 May 2016 20:37:43 +0000
Subject: [CMake] Cache check results and avoid duplicate checks

This caches the result of builtin_check_c_compiler_flag, and removes a duplicate check for C99 flag support.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@269230 91177308-0d34-0410-b5e6-96231b3b80d8
---
 cmake/Modules/BuiltinTests.cmake | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

(limited to 'cmake/Modules/BuiltinTests.cmake')

diff --git a/cmake/Modules/BuiltinTests.cmake b/cmake/Modules/BuiltinTests.cmake
index fde5f7590..1b03e94ac 100644
--- a/cmake/Modules/BuiltinTests.cmake
+++ b/cmake/Modules/BuiltinTests.cmake
@@ -49,12 +49,14 @@ function(try_compile_only output)
 endfunction()
 
 function(builtin_check_c_compiler_flag flag output)
-  message(STATUS "Performing Test ${output}")
-  try_compile_only(result ${flag})
-  set(${output} ${result} PARENT_SCOPE)
-  if(${result})
-    message(STATUS "Performing Test ${output} - Success")
-  else()
-    message(STATUS "Performing Test ${output} - Failed")
+  if(NOT DEFINED ${output})
+    message(STATUS "Performing Test ${output}")
+    try_compile_only(result ${flag})
+    set(${output} ${result} CACHE INTERNAL "Compiler supports ${flag}")
+    if(${result})
+      message(STATUS "Performing Test ${output} - Success")
+    else()
+      message(STATUS "Performing Test ${output} - Failed")
+    endif()
   endif()
 endfunction()
-- 
cgit v1.2.3