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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:06:37 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:06:37 +0000 |
commit | 246f239d9f40f633160f0c18f87a20922d4e77bb (patch) | |
tree | 5a88572663584b3d4d28e5a20e10abab1be40884 /src/test/codegen/README.md | |
parent | Releasing progress-linux version 1.64.0+dfsg1-1~progress7.99u1. (diff) | |
download | rustc-246f239d9f40f633160f0c18f87a20922d4e77bb.tar.xz rustc-246f239d9f40f633160f0c18f87a20922d4e77bb.zip |
Merging debian version 1.65.0+dfsg1-2.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/test/codegen/README.md')
-rw-r--r-- | src/test/codegen/README.md | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/src/test/codegen/README.md b/src/test/codegen/README.md index 00de55eea..8f2daaafc 100644 --- a/src/test/codegen/README.md +++ b/src/test/codegen/README.md @@ -1,2 +1,24 @@ The files here use the LLVM FileCheck framework, documented at <https://llvm.org/docs/CommandGuide/FileCheck.html>. + +One extension worth noting is the use of revisions as custom prefixes for +FileCheck. If your codegen test has different behavior based on the chosen +target or different compiler flags that you want to exercise, you can use a +revisions annotation, like so: + +```rust +// revisions: aaa bbb +// [bbb] compile-flags: --flags-for-bbb +``` + +After specifying those variations, you can write different expected, or +explicitly *unexpected* output by using `<prefix>-SAME:` and `<prefix>-NOT:`, +like so: + +```rust +// CHECK: expected code +// aaa-SAME: emitted-only-for-aaa +// aaa-NOT: emitted-only-for-bbb +// bbb-NOT: emitted-only-for-aaa +// bbb-SAME: emitted-only-for-bbb +``` |