[compiler-rt] [compiler-rt] Update fuzzer/focus-function.test to not require shell. (PR #157967)

[via llvm-commits]

https://github.com/cmtice created https://github.com/llvm/llvm-project/pull/157967

Replace sub-shell for-loops with python calls so this test can run in the lit internal shell. This is part of our work migrating to use the internal shell as the default for lit tests.

>From 44a82c20eee5c841488ac6e098bda5d112ad217d Mon Sep 17 00:00:00 2001
From: Caroline Tice <cmtice at google.com>
Date: Wed, 10 Sep 2025 15:52:42 -0700
Subject: [PATCH] [compiler-rt] Update fuzzer/focus-function.test to not
 require shell.

Replace sub-shell for-loops with python calls so this test can run
in the lit internal shell. This is part of our work migrating
to use the internal shell as the default for lit tests.
---
 compiler-rt/test/fuzzer/focus-function.test | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/compiler-rt/test/fuzzer/focus-function.test b/compiler-rt/test/fuzzer/focus-function.test
index aa15692db358d..b9f0408cfa6d0 100644
--- a/compiler-rt/test/fuzzer/focus-function.test
+++ b/compiler-rt/test/fuzzer/focus-function.test
@@ -1,8 +1,7 @@
 # Tests -focus_function
 #
 # TODO: don't require linux.
-# Requires full shell support for the `for` loop syntax.
-# REQUIRES: shell, linux
+# REQUIRES: linux
 UNSUPPORTED: target=aarch64{{.*}}
 
 RUN: %cpp_compiler %S/OnlySomeBytesTest.cpp -o %t-exe
@@ -22,9 +21,9 @@ FOCUS_F0: INFO: 0/1 inputs touch the focus function
 RUN: rm -rf %t-corpus
 RUN: mkdir %t-corpus
 # ABC triggers the focus function, others don't.
-RUN: echo ABC$(for((i=0;i<2048;i++)); do echo -n x; done) > %t-corpus/ABC
-RUN: echo AXY$(for((i=0;i<2048;i++)); do echo -n x; done) > %t-corpus/AXY
-RUN: echo ABX$(for((i=0;i<2048;i++)); do echo -n x; done) > %t-corpus/ABX
+RUN: %python -c 'x_str = "ABC" + "x" * 2048; print(x_str)' > %t-corpus/ABC
+RUN: %python -c 'x_str = "AXY" + "x" * 2048; print(x_str)' > %t-corpus/AXY
+RUN: %python -c 'x_str = "ABX" + "x" * 2048; print(x_str)' > %t-corpus/ABX
 
 RUN: %run %t-exe -runs=10000 -focus_function=f0 %t-corpus 2>&1 | FileCheck %s --check-prefix=CORPUS_1_3
 CORPUS_1_3: INFO: 1/3 inputs touch the focus function