[OpenCL] Override supported OpenCL extensions with -cl-ext option

Summary:
This patch adds a command line option '-cl-ext' to control a set of
supported OpenCL extensions. Option accepts a comma-separated list
of extensions prefixed with '+' or '-'.

It can be used together with a target triple to override support for some
extensions:

  // spir target supports all extensions, but we want to disable fp64
  clang -cc1 -triple spir-unknown-unknown -cl-ext=-cl_khr_fp64

Special 'all' extension allows to enable or disable all possible
extensions:

  // only fp64 will be supported
  clang -cc1 -triple spir-unknown-unknown -cl-ext=-all,+cl_khr_fp64

Patch by asavonic (Andrew Savonichev).

Reviewers: joey, yaxunl

Subscribers: yaxunl, bader, Anastasia, cfe-commits

Differential Revision: https://reviews.llvm.org/D23712




git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@285700 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 7 insertions, 0 deletions

diff --git a/include/clang/Basic/TargetInfo.h b/include/clang/Basic/TargetInfo.h
index dbdbff8473..d231882e97 100644
--- a/include/clang/Basic/TargetInfo.h
+++ b/include/clang/Basic/TargetInfo.h
@@ -995,6 +995,13 @@ public:
   /// \brief Set supported OpenCL extensions and optional core features.
   virtual void setSupportedOpenCLOpts() {}
 
+  /// \brief Set supported OpenCL extensions as written on command line
+  virtual void setOpenCLExtensionOpts() {
+    for (const auto &Ext : getTargetOpts().OpenCLExtensionsAsWritten) {
+      getTargetOpts().SupportedOpenCLOptions.set(Ext);
+    }
+  }
+
   /// \brief Get supported OpenCL extensions and optional core features.
   OpenCLOptions &getSupportedOpenCLOpts() {
     return getTargetOpts().SupportedOpenCLOptions;