Modules: Do not serialize #pragma pack state

The modules side of r299226, which serializes #pragma pack state,
doesn't work well.

The main purpose was to make -include and -include-pch match semantics
(the PCH side).  We also started serializing #pragma pack in PCMs, in
the hopes of making modules and non-modules builds more consistent.  But
consider:

    $ cat a.h
    $ cat b.h
    #pragma pack(push, 2)
    $ cat module.modulemap
    module M {
        module a { header "a.h" }
        module b { header "b.h" }
    }
    $ cat t.cpp
    #include "a.h"
    #pragma pack(show)

As of r299226, the #pragma pack(show) gives "2", even though we've only
included "a.h".

- With -fmodules-local-submodule-visibility, this is clearly wrong.  We
  should get the default state (8 on x86_64).

- Without -fmodules-local-submodule-visibility, this kind of matches how
  other things work (as if include-the-whole-module), but it's still
  really terrible, and it doesn't actually make modules and non-modules
  builds more consistent.

This commit disables the serialization for modules, essentially a
partial revert of r299226.

Going forward:

 1. Having this #pragma pack stuff escape is terrible design (or, more
    often, a horrible bug).  We should prioritize adding warnings (maybe
    -Werror by default?).

 2. If we eventually reintroduce this for modules, it should only apply
    to -fmodules-local-submodule-visibility, and it should be tracked on
    a per-submodule basis.

llvm-svn: 300380

1 files changed, 25 insertions, 0 deletions

diff --git a/clang/test/Modules/pragma-pack.cpp b/clang/test/Modules/pragma-pack.cpp
new file mode 100644
index 00000000000..96a880c6307
--- /dev/null
+++ b/clang/test/Modules/pragma-pack.cpp
@@ -0,0 +1,25 @@
+// RUN: rm -rf %t.cache %tlocal.cache
+// RUN: %clang_cc1 -triple x86_64-apple-darwin10 -fmodules \
+// RUN:   -fimplicit-module-maps -x c++ -emit-module \
+// RUN:   -fmodules-cache-path=%t.cache \
+// RUN:   -fmodule-name=pragma_pack %S/Inputs/module.map
+// RUN: %clang_cc1 -triple x86_64-apple-darwin10 -fmodules \
+// RUN:   -fimplicit-module-maps -x c++ -verify \
+// RUN:   -fmodules-cache-path=%t.cache \
+// RUN:   -I%S/Inputs %s
+// RUN: %clang_cc1 -triple x86_64-apple-darwin10 -fmodules \
+// RUN:   -fmodules-local-submodule-visibility \
+// RUN:   -fimplicit-module-maps -x c++ -emit-module \
+// RUN:   -fmodules-cache-path=%tlocal.cache \
+// RUN:   -fmodule-name=pragma_pack %S/Inputs/module.map
+// RUN: %clang_cc1 -triple x86_64-apple-darwin10 -fmodules \
+// RUN:   -fmodules-local-submodule-visibility \
+// RUN:   -fimplicit-module-maps -x c++ -verify \
+// RUN:   -fmodules-cache-path=%tlocal.cache \
+// RUN:   -I%S/Inputs %s
+
+// Check that we don't serialize pragma pack state until/unless including an
+// empty file from the same module (but different submodule) has no effect.
+#pragma pack (show) // expected-warning {{value of #pragma pack(show) == 8}}
+#include "empty.h"
+#pragma pack (show) // expected-warning {{value of #pragma pack(show) == 8}}