Add test to verify return code from llvm-foreach run tool is retained

Author: mdtoguchi

llvm/test/tools/llvm-foreach/retain-return-val.c

@@ -0,0 +1,23 @@
+// REQUIRES: system-linux
+// Test that the return value from the called tool is retained.
+// Runs a script within a script so we can retain the return code without
+// the testing infrastructure getting in the way.
+
+// RUN: echo 'Content of first file' > %t1.tgt
+// RUN: echo 'Content of second file' > %t2.tgt
+// RUN: echo "%t1.tgt" > %t.list
+// RUN: echo "%t2.tgt" >> %t.list
+
+// RUN: echo "#!/bin/sh" > %t.sh
+// RUN: echo "cat \$1" >> %t.sh
+// RUN: echo "exit 21" >> %t.sh
+// RUN: chmod 777 %t.sh
+// RUN: echo "#!/bin/sh" > %t2.sh
+// RUN: echo "llvm-foreach --in-replace=\"{}\" --in-file-list=%t.list -- %t.sh \"{}\" > %t.res" >> %t2.sh
+// RUN: echo "echo \$? >> %t.res" >> %t2.sh
+// RUN: chmod 777 %t2.sh
+// RUN: %t2.sh
+// RUN: FileCheck < %t.res %s
+// CHECK: Content of first file
+// CHECK: Content of second file
+// CHECK: 21