tree 799f65f50f3c8d3bcc0570641e2fbdd821f5f0e4
parent b722d8baf1a5ca7f0f5d88081e8378f119396ca8
author Scott Graham <scottmg@chromium.org> 1597168730 -0700
committer Commit Bot <commit-bot@chromium.org> 1598039313 +0000

clang: Fixes to module support

1. -fmodules-embed-all-files is a cc1 flag, and should have been passed
   to clang++ via -Xclang.

2. Don't require a .cc in the target to emit the module_deps variables
   (this is to be able to compile a target that contains only a
   .modulemap, e.g. the C++ std module).

3. Add {{module_deps_no_self}}, which is the same as {{module_deps}}
   except that it excludes the flags to include the pcm for the current
   target.

   That is, for A depending on B, and both using modules, when building
   for A, {{module_deps}} will reference both A.pcm and B.pcm, and so
   can be used to build .cc files in A. By contrast,
   {{module_deps_no_self}} for A will only reference B.pcm, and so can
   be used to build A.pcm.

Bug: fuchsia:27276
Change-Id: I239d1c5cd4d5d167251801b1347b02e8d89caeee
Reviewed-on: https://gn-review.googlesource.com/c/gn/+/9680
Reviewed-by: Brett Wilson <brettw@chromium.org>
Commit-Queue: Scott Graham <scottmg@chromium.org>