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llvm-mirror/utils/lit/tests/Inputs/shtest-shell/diff-pipes.txt
Joel E. Denny 84b5bf580c [lit] Extend internal diff to support - argument
When using lit's internal shell, RUN lines like the following
accidentally execute an external `diff` instead of lit's internal
`diff`:

```
 # RUN: program | diff file -
```

Such cases exist now, in `clang/test/Analysis` for example.  We are
preparing patches to ensure lit's internal `diff` is called in such
cases, which will then fail because lit's internal `diff` doesn't
recognize `-` as a command-line option.  This patch adds support for
`-` to mean stdin.

Reviewed By: probinson, rnk

Differential Revision: https://reviews.llvm.org/D67643
2019-10-29 15:13:53 -04:00

26 lines
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# RUN: echo foo > %t.foo
# RUN: echo bar > %t.bar
# Check output pipe.
# RUN: diff %t.foo %t.foo | FileCheck -allow-empty -check-prefix=EMPTY %s
# RUN: diff -u %t.foo %t.bar | FileCheck %s && false || true
# Check input pipe.
# RUN: cat %t.foo | diff -u - %t.foo
# RUN: cat %t.foo | diff -u %t.foo -
# RUN: cat %t.bar | diff -u %t.foo - && false || true
# RUN: cat %t.bar | diff -u - %t.foo && false || true
# Check output and input pipes at the same time.
# RUN: cat %t.foo | diff - %t.foo | FileCheck -allow-empty -check-prefix=EMPTY %s
# RUN: cat %t.bar | diff -u %t.foo - | FileCheck %s && false || true
# Fail so lit will print output.
# RUN: false
# CHECK: @@
# CHECK-NEXT: -foo
# CHECK-NEXT: +bar
# EMPTY-NOT: {{.}}