From cf95b338d14685e4f3402ab1828bef31d48f1fd6 Mon Sep 17 00:00:00 2001
From: Wenju He <wenju.he@intel.com>
Date: Mon, 12 Jun 2023 16:16:31 +0800
Subject: [PATCH] Partially revert 53b8f126 on linux (#460)

The issue in 53b8f126 isn't observed on linux.
This allows parallel execution of clang::ExecuteCompilerInvocation and
parallel execution of llvm::writeSpirv.
This improves performance of multi-threaded OpenCL tests on linux.
---
 common_clang.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/common_clang.cpp b/common_clang.cpp
index 426235ba..4b2579cc 100644
--- a/common_clang.cpp
+++ b/common_clang.cpp
@@ -212,7 +212,9 @@ Compile(const char *pszProgramSource, const char **pInputHeaders,
   CommonClangInitialize();
 
   try {
+#ifdef _WIN32
     llvm::sys::SmartScopedLock<true> compileGuard{*compileMutex};
+#endif
     std::unique_ptr<OCLFEBinaryResult> pResult(new OCLFEBinaryResult());
 
     // Create the clang compiler
@@ -224,6 +226,9 @@ Compile(const char *pszProgramSource, const char **pInputHeaders,
     // Prepare error log
     llvm::raw_string_ostream err_ostream(pResult->getLogRef());
     {
+#ifndef _WIN32
+      llvm::sys::SmartScopedLock<true> compileGuard{*compileMutex};
+#endif
       // Parse options
       optionsParser.processOptions(pszOptions, pszOptionsEx);
 
@@ -342,6 +347,9 @@ Compile(const char *pszProgramSource, const char **pInputHeaders,
       err_ostream.flush();
     }
     {
+#ifndef _WIN32
+      llvm::sys::SmartScopedLock<true> compileGuard{*compileMutex};
+#endif
       if (pBinaryResult) {
         *pBinaryResult = pResult.release();
       }