[libcxx-commits] [libcxx] [libc++] Don't run multithreaded stringstream benchmarks (PR #158294)

[Louis Dionne via libcxx-commits]

https://github.com/ldionne created https://github.com/llvm/llvm-project/pull/158294

This results in invalid JSON output as reported
in google/benchmark#2039.

>From d0b0317afe1090839de50a074f1946b1f7f9d471 Mon Sep 17 00:00:00 2001
From: Louis Dionne <ldionne.2 at gmail.com>
Date: Fri, 12 Sep 2025 09:48:40 -0400
Subject: [PATCH] [libc++] Don't run multithreaded stringstream benchmarks

This results in invalid JSON output as reported
in google/benchmark#2039.
---
 libcxx/test/benchmarks/stringstream.bench.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libcxx/test/benchmarks/stringstream.bench.cpp b/libcxx/test/benchmarks/stringstream.bench.cpp
index b7c50a96ef51e..367024c49ac69 100644
--- a/libcxx/test/benchmarks/stringstream.bench.cpp
+++ b/libcxx/test/benchmarks/stringstream.bench.cpp
@@ -80,7 +80,7 @@ static void BM_Istream_numbers(benchmark::State& state) {
   while (state.KeepRunning())
     benchmark::DoNotOptimize(i += istream_numbers(sel.imbue));
 }
-BENCHMARK(BM_Istream_numbers)->DenseRange(0, 3)->UseRealTime()->Threads(1)->ThreadPerCpu();
+BENCHMARK(BM_Istream_numbers)->DenseRange(0, 3);
 
 static void BM_Ostream_number(benchmark::State& state) {
   LocaleSelector sel(state);
@@ -92,6 +92,6 @@ static void BM_Ostream_number(benchmark::State& state) {
     benchmark::DoNotOptimize(ss.str().c_str());
   }
 }
-BENCHMARK(BM_Ostream_number)->DenseRange(0, 3)->UseRealTime()->Threads(1)->ThreadPerCpu();
+BENCHMARK(BM_Ostream_number)->DenseRange(0, 3);
 
 BENCHMARK_MAIN();