Support lazy stat'ing of files referenced by module maps.
This patch adds support for a `header` declaration in a module map to specify
certain `stat` information (currently, size and mtime) about that header file.
This has two purposes:
- It removes the need to eagerly `stat` every file referenced by a module map.
Instead, we track a list of unresolved header files with each size / mtime
(actually, for simplicity, we track submodules with such headers), and when
attempting to look up a header file based on a `FileEntry`, we check if there
are any unresolved header directives with that `FileEntry`'s size / mtime and
perform deferred `stat`s if so.
- It permits a preprocessed module to be compiled without the original files
being present on disk. The only reason we used to need those files was to get
the `stat` information in order to do header -> module lookups when using the
module. If we're provided with the `stat` information in the preprocessed
module, we can avoid requiring the files to exist.
Unlike most `header` directives, if a `header` directive with `stat`
information has no corresponding on-disk file the enclosing module is *not*
marked unavailable (so that behavior is consistent regardless of whether we've
resolved a header directive, and so that preprocessed modules don't get marked
unavailable). We could actually do this for all `header` directives: the only
reason we mark the module unavailable if headers are missing is to give a
diagnostic slightly earlier (rather than waiting until we actually try to build
the module / load and validate its .pcm file).
Differential Revision: https://reviews.llvm.org/D33703
llvm-svn: 304515
diff --git a/clang/test/Modules/header-attribs.cpp b/clang/test/Modules/header-attribs.cpp
new file mode 100644
index 0000000..292a945
--- /dev/null
+++ b/clang/test/Modules/header-attribs.cpp
@@ -0,0 +1,10 @@
+// RUN: rm -rf %t
+// RUN: %clang_cc1 -fmodules -I%S/Inputs/header-attribs -fmodule-map-file=%S/Inputs/header-attribs/textual.modulemap -fmodules-cache-path=%t -verify %s -fmodule-name=A -fmodules-strict-decluse
+// RUN: not %clang_cc1 -fmodules -I%S/Inputs/header-attribs -emit-module -x c++-module-map %S/Inputs/header-attribs/modular.modulemap -fmodules-cache-path=%t -fmodule-name=A 2>&1 | FileCheck %s --check-prefix BUILD-MODULAR
+
+#include "foo.h" // ok, stats match
+#include "bar.h" // expected-error {{does not depend on a module exporting 'bar.h'}}
+#include "baz.h" // expected-error {{does not depend on a module exporting 'baz.h'}}
+
+// FIXME: Explain why the 'bar.h' found on disk doesn't match the module map.
+// BUILD-MODULAR: error: header 'bar.h' not found