[clang] 834a878 - [C++2b] [Modules] Handle HaveModules with C++2b

[Chuanqi Xu via cfe-commits]

Author: Chuanqi Xu
Date: 2022-08-01T16:06:34+08:00
New Revision: 834a878367f549c58313200ce2c3a0da1a29d842

URL: https://github.com/llvm/llvm-project/commit/834a878367f549c58313200ce2c3a0da1a29d842
DIFF: https://github.com/llvm/llvm-project/commit/834a878367f549c58313200ce2c3a0da1a29d842.diff

LOG: [C++2b] [Modules] Handle HaveModules with C++2b

Closing https://github.com/llvm/llvm-project/issues/56803. The root
cause for this bug is that we lack a good method to detect the language
mdoe when parsing the command line. There is a FIXME too. Dut to we lack
a good solution now, keep the workaround.

Added: 
    clang/test/Driver/modules-fprebuilt-mdoule-path.cpp

Modified: 
    clang/lib/Driver/ToolChains/Clang.cpp

Removed: 
    


################################################################################
diff  --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
index f41d6f4228b62..c691cae27c972 100644
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -6595,7 +6595,7 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
   // support by default, or just assume that all languages do.
   bool HaveModules =
       Std && (Std->containsValue("c++2a") || Std->containsValue("c++20") ||
-              Std->containsValue("c++latest"));
+              Std->containsValue("c++2b") || Std->containsValue("c++latest"));
   RenderModulesOptions(C, D, Args, Input, Output, CmdArgs, HaveModules);
 
   if (Args.hasFlag(options::OPT_fpch_validate_input_files_content,

diff  --git a/clang/test/Driver/modules-fprebuilt-mdoule-path.cpp b/clang/test/Driver/modules-fprebuilt-mdoule-path.cpp
new file mode 100644
index 0000000000000..a2c830bfda00b
--- /dev/null
+++ b/clang/test/Driver/modules-fprebuilt-mdoule-path.cpp
@@ -0,0 +1,7 @@
+// RUN: %clang -std=c++2a -fprebuilt-module-path=. -### -c %s 2>&1 | FileCheck %s
+// RUN: %clang -std=c++20 -fprebuilt-module-path=. -### -c %s 2>&1 | FileCheck %s
+// RUN: %clang -std=c++2b -fprebuilt-module-path=. -### -c %s 2>&1 | FileCheck %s
+// RUN: %clang -std=c++latest -fprebuilt-module-path=. -### -c %s 2>&1 | FileCheck %s
+//
+// CHECK-NOT: warning: argument unused during compilation
+// CHECK: -fprebuilt-module-path=.