[modules] PR22534: Load files specified by -fmodule-file= eagerly. In particular, this avoids the need to re-parse module map files when using such a module.

llvm-svn: 244416

1 files changed, 21 insertions, 0 deletions

diff --git a/clang/test/Modules/explicit-build-missing-files.cpp b/clang/test/Modules/explicit-build-missing-files.cpp
new file mode 100644
index 0000000..2ea157b
--- /dev/null
+++ b/clang/test/Modules/explicit-build-missing-files.cpp
@@ -0,0 +1,21 @@
+// RUN: rm -rf %t
+// RUN: mkdir %t
+// RUN: echo 'extern int a;' > %t/a.h
+// RUN: echo 'extern int b;' > %t/b.h
+// RUN: echo 'module a { header "a.h" header "b.h" }' > %t/modulemap
+
+// We lazily check that the files referenced by an explicitly-specified .pcm
+// file exist. Test this by removing files and ensuring that the compilation
+// still succeeds.
+//
+// RUN: %clang_cc1 -fmodules -I %t -emit-module -fmodule-name=a -x c++ %t/modulemap -o %t/a.pcm
+// RUN: %clang_cc1 -fmodules -I %t -fmodule-file=%t/a.pcm %s
+// RUN: rm %t/modulemap
+// RUN: %clang_cc1 -fmodules -I %t -fmodule-file=%t/a.pcm %s
+// RUN: rm %t/b.h
+// RUN: %clang_cc1 -fmodules -I %t -fmodule-file=%t/a.pcm %s
+// RUN: rm %t/a.h
+// RUN: %clang_cc1 -fmodules -I %t -fmodule-file=%t/a.pcm %s -verify
+
+#include "a.h" // expected-error {{file not found}}
+int x = b;