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| author | Peter Wu <peter@lekensteyn.nl> | 2017-10-19 23:53:27 +0000 |
|---|---|---|
| committer | Peter Wu <peter@lekensteyn.nl> | 2017-10-19 23:53:27 +0000 |
| commit | cc28d36809ee131966e1bd25939748d9f7cc07a4 (patch) | |
| tree | 7be759ba49de0955c38cf3493cee4e936f9cc209 /test/Preprocessor | |
| 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
Diffstat (limited to 'test/Preprocessor')
| -rw-r--r-- | test/Preprocessor/dependencies-realpath.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/test/Preprocessor/dependencies-realpath.c b/test/Preprocessor/dependencies-realpath.c new file mode 100644 index 0000000000..555b79fc13 --- /dev/null +++ b/test/Preprocessor/dependencies-realpath.c @@ -0,0 +1,33 @@ +// RUN: mkdir -p %t/sub/dir +// RUN: echo > %t/sub/empty.h + +// Test that system header paths are expanded +// +// RUN: %clang -fsyntax-only -MD -MF %t.d -MT foo %s -isystem %t/sub/dir/.. +// RUN: FileCheck -check-prefix=TEST1 %s < %t.d +// TEST1: foo: +// TEST1: sub{{/|\\}}empty.h + +// Test that system header paths are not expanded to a longer form +// +// RUN: cd %t && %clang -fsyntax-only -MD -MF %t.d -MT foo %s -isystem sub/dir/.. +// RUN: FileCheck -check-prefix=TEST2 %s < %t.d +// TEST2: foo: +// TEST2: sub/dir/..{{/|\\}}empty.h + +// Test that user header paths are not expanded +// +// RUN: %clang -fsyntax-only -MD -MF %t.d -MT foo %s -I %t/sub/dir/.. +// RUN: FileCheck -check-prefix=TEST3 %s < %t.d +// TEST3: foo: +// TEST3: sub/dir/..{{/|\\}}empty.h + +// Test that system header paths are not expanded with -fno-canonical-system-headers +// (and also that the -fsystem-system-headers option is accepted) +// +// RUN: %clang -fsyntax-only -MD -MF %t.d -MT foo %s -I %t/sub/dir/.. -fcanonical-system-headers -fno-canonical-system-headers +// RUN: FileCheck -check-prefix=TEST4 %s < %t.d +// TEST4: foo: +// TEST4: sub/dir/..{{/|\\}}empty.h + +#include <empty.h> |