Introduce a test runner script to simplify invocation

... And to use a standard, highly amusing trick for making
coloured output work.


[ROCm/hip commit: 80120aed22]

projects/hip/tests/hipify-clang/axpy.cu

@@ -1,4 +1,4 @@
-// RUN: hipify "%s" -o=%t -- %cuda_args && cat %t | sed -Ee 's|//.+|// |g' | FileCheck %s
+// RUN: %run_test hipify "%s" "%t" %cuda_args
 
 #include <iostream>
 

projects/hip/tests/hipify-clang/lit.cfg

@@ -48,3 +48,4 @@ config.substitutions.append(("hipify", obj_root+"/hipify-clang"))
 
 # Clang args for CUDA...
 config.substitutions.append(("%cuda_args", "-x cuda --cuda-path=%s --cuda-gpu-arch=sm_30" % config.cuda_root))
+config.substitutions.append(("%run_test", config.test_source_root + "/run_test.sh"))

projects/hip/tests/hipify-clang/run_test.sh

@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+
+set -o errexit
+
+# Run a single LIT test file in a magical way that preserves colour output, to work around
+# a known flaw in lit.
+
+# Capture lit substitutions
+HIPIFY=$1
+IN_FILE=$2
+TMP_FILE=$3
+shift 3
+
+# Remaining args are the ones to forward to clang proper.
+
+# Time for the classic insane little trick for making colour output work.
+# A self-deleting shell-script that does the thing we want to do...
+TMP_SCRIPT=$(mktemp)
+cat << EOF > $TMP_SCRIPT
+set -o errexit
+set -o xtrace
+rm $TMP_SCRIPT
+$HIPIFY -o=$TMP_FILE $IN_FILE -- $@ && cat $TMP_FILE | sed -Ee 's|//.+|// |g' | FileCheck $IN_FILE
+EOF
+chmod a+x $TMP_SCRIPT
+
+# Run the script via socat, spawning a virtual terminal and propagating exit code, and hence failure.
+socat -du EXEC:$TMP_SCRIPT,pty,stderr STDOUT