[pstl] Add a __pstl_config_site header to record the CMake configuration

This commit adds a __pstl_config_site header that contains the value of
macros specified at CMake configuration time. It works similarly to
libc++'s __config_site header, except we always include it as a separate
file instead of concatenating it to the main configuration header.

It is necessary to thread the includes for that header into libc++'s
lit configuration, otherwise we'd be requiring an installation step
prior to running the test suite.

llvm-svn: 368284

2 files changed, 17 insertions, 0 deletions

diff --git a/pstl/include/__pstl_config_site.in b/pstl/include/__pstl_config_site.in
new file mode 100644
index 00000000000..f92c695bad5
--- /dev/null
+++ b/pstl/include/__pstl_config_site.in
@@ -0,0 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __PSTL_CONFIG_SITE
+#define __PSTL_CONFIG_SITE
+
+#cmakedefine _PSTL_PAR_BACKEND_SERIAL
+#cmakedefine _PSTL_PAR_BACKEND_TBB
+
+#endif // __PSTL_CONFIG_SITE
diff --git a/pstl/include/pstl/internal/pstl_config.h b/pstl/include/pstl/internal/pstl_config.h
index ba964912e66..ba0bc148484 100644
--- a/pstl/include/pstl/internal/pstl_config.h
+++ b/pstl/include/pstl/internal/pstl_config.h
@@ -10,6 +10,8 @@
 #ifndef _PSTL_CONFIG_H
 #define _PSTL_CONFIG_H
 
+#include <__pstl_config_site>
+
 // The version is XYYZ, where X is major, YY is minor, and Z is patch (i.e. X.YY.Z)
 #define _PSTL_VERSION 10000
 #define _PSTL_VERSION_MAJOR (_PSTL_VERSION / 1000)