Duncan pointed out that sometimes CC and CXX are used to specify the compiler. Also that the configure script takes care of finding an appropriate compiler if one's not specified.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142489 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/release/test-release.sh b/utils/release/test-release.sh
index 00a1ac1..4255324 100755
--- a/utils/release/test-release.sh
+++ b/utils/release/test-release.sh
@@ -141,26 +141,8 @@
 mkdir -p $LogDir
 
 # Find a compilers.
-c_compiler="`which clang`"
-if [ -z "$c_compiler" ]; then
-    c_compiler="`which gcc`"
-    if [ -z "$c_compiler" ]; then
-        c_compiler="`which cc`"
-        if [ -z "$c_compiler" ]; then
-            echo "error: cannot find a working C compiler"
-        fi
-    fi
-fi
-cxx_compiler="`which clang++`"
-if [ -z "$cxx_compiler" ]; then
-    cxx_compiler="`which g++`"
-    if [ -z "$cxx_compiler" ]; then
-        cxx_compiler="`which c++`"
-        if [ -z "$cxx_compiler" ]; then
-            echo "error: cannot find a working C++ compiler"
-        fi
-    fi
-fi
+c_compiler="$CC"
+cxx_compiler="$CXX"
 
 # Make sure that the URLs are valid.
 function check_valid_urls() {