[libcxx-commits] [libcxx] [libc++][AIX] Use input redirection instead of piping for cin tests (PR #83184)

[Jake Egan via libcxx-commits]

https://github.com/jakeegan created https://github.com/llvm/llvm-project/pull/83184

When echo is used for piping, lit uses the system echo rather than the builtin echo. The system echo on AIX doesn't support the `-n` option, which causes these tests to fail. Use input redirection, so the builtin echo can be used. 

>From 3c128eedc9d5494c04f9675f5e434e656596f5cd Mon Sep 17 00:00:00 2001
From: Jake Egan <5326451+jakeegan at users.noreply.github.com>
Date: Tue, 27 Feb 2024 15:55:59 -0500
Subject: [PATCH] [libc++][AIX] Use input redirection instead of piping for cin
 tests

---
 .../iostream.objects/narrow.stream.objects/cin.sh.cpp       | 6 ++----
 .../iostream.objects/wide.stream.objects/wcin-imbue.sh.cpp  | 6 ++----
 .../iostream.objects/wide.stream.objects/wcin.sh.cpp        | 6 ++----
 3 files changed, 6 insertions(+), 12 deletions(-)

diff --git a/libcxx/test/std/input.output/iostream.objects/narrow.stream.objects/cin.sh.cpp b/libcxx/test/std/input.output/iostream.objects/narrow.stream.objects/cin.sh.cpp
index ce6a7f37801e10..4f23b6b9a5d877 100644
--- a/libcxx/test/std/input.output/iostream.objects/narrow.stream.objects/cin.sh.cpp
+++ b/libcxx/test/std/input.output/iostream.objects/narrow.stream.objects/cin.sh.cpp
@@ -6,9 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-// TODO: Investigate
-// UNSUPPORTED: LIBCXX-AIX-FIXME
-
 // QEMU does not detect EOF, when reading from stdin
 // "echo -n" suppresses any characters after the output and so the test hangs.
 // https://gitlab.com/qemu-project/qemu/-/issues/1963
@@ -23,7 +20,8 @@
 // istream cin;
 
 // RUN: %{build}
-// RUN: echo -n 1234 | %{exec} %t.exe
+// RUN: echo -n 1234 > %t.input
+// RUN: %{exec} %t.exe < %t.input
 
 #include <iostream>
 #include <cassert>
diff --git a/libcxx/test/std/input.output/iostream.objects/wide.stream.objects/wcin-imbue.sh.cpp b/libcxx/test/std/input.output/iostream.objects/wide.stream.objects/wcin-imbue.sh.cpp
index 027e4fa936f11d..6ae1972234b2bf 100644
--- a/libcxx/test/std/input.output/iostream.objects/wide.stream.objects/wcin-imbue.sh.cpp
+++ b/libcxx/test/std/input.output/iostream.objects/wide.stream.objects/wcin-imbue.sh.cpp
@@ -6,9 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-// TODO: Investigate
-// UNSUPPORTED: LIBCXX-AIX-FIXME
-
 // This test hangs on Android devices that lack shell_v2, which was added in
 // Android N (API 24).
 // UNSUPPORTED: LIBCXX-ANDROID-FIXME && android-device-api={{2[1-3]}}
@@ -20,7 +17,8 @@
 // UNSUPPORTED: no-wide-characters
 
 // RUN: %{build}
-// RUN: echo -n 1234 | %{exec} %t.exe
+// RUN: echo -n 1234 > %t.input
+// RUN: %{exec} %t.exe < %t.input
 
 #include <iostream>
 #include <cassert>
diff --git a/libcxx/test/std/input.output/iostream.objects/wide.stream.objects/wcin.sh.cpp b/libcxx/test/std/input.output/iostream.objects/wide.stream.objects/wcin.sh.cpp
index 30972da2f09348..08b74b999bbf4f 100644
--- a/libcxx/test/std/input.output/iostream.objects/wide.stream.objects/wcin.sh.cpp
+++ b/libcxx/test/std/input.output/iostream.objects/wide.stream.objects/wcin.sh.cpp
@@ -6,9 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-// TODO: Investigate
-// UNSUPPORTED: LIBCXX-AIX-FIXME
-
 // This test hangs on Android devices that lack shell_v2, which was added in
 // Android N (API 24).
 // UNSUPPORTED: LIBCXX-ANDROID-FIXME && android-device-api={{2[1-3]}}
@@ -20,7 +17,8 @@
 // UNSUPPORTED: no-wide-characters
 
 // RUN: %{build}
-// RUN: echo -n 1234 | %{exec} %t.exe
+// RUN: echo -n 1234 > %t.input
+// RUN: %{exec} %t.exe < %t.input
 
 #include <iostream>
 #include <cassert>