| commit | cc28d36809ee131966e1bd25939748d9f7cc07a4 | [log] [tgz] |
|---|---|---|
| author | Peter Wu <peter@lekensteyn.nl> | Thu Oct 19 23:53:27 2017 +0000 |
| committer | Peter Wu <peter@lekensteyn.nl> | Thu Oct 19 23:53:27 2017 +0000 |
| tree | 7be759ba49de0955c38cf3493cee4e936f9cc209 | |
| parent | 22b25a6d050b61a793c93450488a1a7c5e2b9e09 [diff] |
Try to shorten system header paths when using -MD depfiles GCC tries to shorten system headers in depfiles using its real path (resolving components like ".." and following symlinks). Mimic this feature to ensure that the Ninja build tool detects the correct dependencies when a symlink changes directory levels, see https://github.com/ninja-build/ninja/issues/1330 An option to disable this feature is added in case "these changed header paths may conflict with some compilation environments", see https://gcc.gnu.org/ml/gcc-patches/2012-09/msg00287.html Note that the original feature request for GCC (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52974) also included paths preprocessed output (-E) and diagnostics. That is not implemented now since I am not sure if it breaks something else. Differential Revision: https://reviews.llvm.org/D37954 git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@316193 91177308-0d34-0410-b5e6-96231b3b80d8