[c++20] Enable driver and frontend support for building and using

modules when -std=c++2a is specified.

llvm-svn: 358355

1 files changed, 74 insertions, 0 deletions

diff --git a/clang/test/Driver/modules.cpp b/clang/test/Driver/modules.cpp
new file mode 100644
index 00000000000..4f7439cc599
--- /dev/null
+++ b/clang/test/Driver/modules.cpp
@@ -0,0 +1,74 @@
+// RUN: rm -rf %t
+// RUN: mkdir %t
+
+// Check compiling a module interface to a .pcm file.
+//
+// RUN: %clang -std=c++2a -x c++-module --precompile %s -o %t/module.pcm -v 2>&1 | FileCheck %s --check-prefix=CHECK-PRECOMPILE
+//
+// CHECK-PRECOMPILE: -cc1 {{.*}} -emit-module-interface
+// CHECK-PRECOMPILE-SAME: -o {{.*}}.pcm
+// CHECK-PRECOMPILE-SAME: -x c++
+// CHECK-PRECOMPILE-SAME: modules.cpp
+
+// Check compiling a .pcm file to a .o file.
+//
+// RUN: %clang -std=c++2a %t/module.pcm -c -o %t/module.pcm.o -v 2>&1 | FileCheck %s --check-prefix=CHECK-COMPILE
+//
+// CHECK-COMPILE: -cc1 {{.*}} -emit-obj
+// CHECK-COMPILE-SAME: -o {{.*}}.pcm.o
+// CHECK-COMPILE-SAME: -x pcm
+// CHECK-COMPILE-SAME: {{.*}}.pcm
+
+// Check use of a .pcm file in another compilation.
+//
+// RUN: %clang -std=c++2a -fmodule-file=%t/module.pcm -Dexport= %s -c -o %t/module.o -v 2>&1 | FileCheck %s --check-prefix=CHECK-USE
+//
+// CHECK-USE: -cc1
+// CHECK-USE-SAME: -emit-obj
+// CHECK-USE-SAME: -fmodule-file={{.*}}.pcm
+// CHECK-USE-SAME: -o {{.*}}.o{{"?}} {{.*}}-x c++
+// CHECK-USE-SAME: modules.cpp
+
+// Check combining precompile and compile steps works.
+//
+// RUN: %clang -std=c++2a -x c++-module %s -c -o %t/module2.pcm.o -v 2>&1 | FileCheck %s --check-prefix=CHECK-PRECOMPILE --check-prefix=CHECK-COMPILE
+
+// Check that .cppm is treated as a module implicitly.
+//
+// RUN: cp %s %t/module.cppm
+// RUN: %clang -std=c++2a --precompile %t/module.cppm -o %t/module.pcm -v 2>&1 | FileCheck %s --check-prefix=CHECK-PRECOMPILE
+
+// Check compiling a header unit to a .pcm file.
+//
+// RUN: echo '#define FOO BAR' > %t/foo.h
+// RUN: %clang -std=c++2a --precompile -x c++-header %t/foo.h -fmodule-name=header -o %t/foo.pcm -v 2>&1 | FileCheck %s --check-prefix=CHECK-HEADER-UNIT
+//
+// CHECK-HEADER-UNIT: -cc1
+// CHECK-HEADER-UNIT-SAME: -emit-header-module
+// CHECK-HEADER-UNIT-SAME: -fmodule-name=header
+// CHECK-HEADER-UNIT-SAME: -o {{.*}}foo.pcm
+// CHECK-HEADER-UNIT-SAME: -x c++-header
+// CHECK-HEADER-UNIT-SAME: foo.h
+
+// Check use of header unit.
+//
+// RUN: %clang -std=c++2a -fmodule-file=%t/module.pcm -fmodule-file=%t/foo.pcm -I%t -DIMPORT -Dexport= %s -E -o - -v 2>&1 | FileCheck %s --check-prefix=CHECK-HEADER-UNIT-USE
+//
+// CHECK-HEADER-UNIT-USE: -cc1
+// CHECK-HEADER-UNIT-USE: -E
+// CHECK-HEADER-UNIT-USE: -fmodule-file={{.*}}module.pcm
+// CHECK-HEADER-UNIT-USE: -fmodule-file={{.*}}foo.pcm
+
+// Note, we use -Dexport= to make this a module implementation unit when building the implementation.
+export module foo;
+
+#ifdef IMPORT
+// CHECK-HEADER-UNIT-USE: FOO;
+FOO;
+
+// CHECK-HEADER-UNIT-USE: import header.{{.*}}foo.h{{.*}};
+import "foo.h";
+
+// CHECK-HEADER-UNIT-USE: BAR;
+FOO;
+#endif