[libc++] Make benchmarks forward-compatible with the test suite (#114502)

This patch fixes warnings and errors that come up when running the
benchmarks as part of the test suite. It also adds the necessary Lit
annotations to make it pass in various configurations and increases the
portability of the benchmarks.

Author: ldionne

libcxx/test/benchmarks/CartesianBenchmarks.h

@@ -27,11 +27,11 @@ constexpr auto makeEnumValueTuple(std::index_sequence<Idxs...>) {
 }
 
 template <class B>
-static auto skip(const B& Bench, int) -> decltype(Bench.skip()) {
+auto skip(const B& Bench, int) -> decltype(Bench.skip()) {
   return Bench.skip();
 }
 template <class B>
-static auto skip(const B& Bench, char) {
+auto skip(const B&, char) {
   return false;
 }
 
@@ -51,7 +51,7 @@ void makeBenchmarkFromValues(const std::vector<std::tuple<Args...> >& A) {
 }
 
 template <template <class...> class B, class Args, class... U>
-void makeBenchmarkImpl(const Args& A, std::tuple<U...> t) {
+void makeBenchmarkImpl(const Args& A, std::tuple<U...>) {
   makeBenchmarkFromValues<B<U...> >(A);
 }
 

libcxx/test/benchmarks/ContainerBenchmarks.h

@@ -150,7 +150,7 @@ void BM_EmplaceDuplicate(benchmark::State& st, Container c, GenInputs gen) {
 }
 
 template <class Container, class GenInputs>
-static void BM_Find(benchmark::State& st, Container c, GenInputs gen) {
+void BM_Find(benchmark::State& st, Container c, GenInputs gen) {
   auto in = gen(st.range(0));
   c.insert(in.begin(), in.end());
   benchmark::DoNotOptimize(&(*c.begin()));
@@ -164,7 +164,7 @@ static void BM_Find(benchmark::State& st, Container c, GenInputs gen) {
 }
 
 template <class Container, class GenInputs>
-static void BM_FindRehash(benchmark::State& st, Container c, GenInputs gen) {
+void BM_FindRehash(benchmark::State& st, Container c, GenInputs gen) {
   c.rehash(8);
   auto in = gen(st.range(0));
   c.insert(in.begin(), in.end());
@@ -179,7 +179,7 @@ static void BM_FindRehash(benchmark::State& st, Container c, GenInputs gen) {
 }
 
 template <class Container, class GenInputs>
-static void BM_Rehash(benchmark::State& st, Container c, GenInputs gen) {
+void BM_Rehash(benchmark::State& st, Container c, GenInputs gen) {
   auto in = gen(st.range(0));
   c.max_load_factor(3.0);
   c.insert(in.begin(), in.end());
@@ -193,7 +193,7 @@ static void BM_Rehash(benchmark::State& st, Container c, GenInputs gen) {
 }
 
 template <class Container, class GenInputs>
-static void BM_Compare_same_container(benchmark::State& st, Container, GenInputs gen) {
+void BM_Compare_same_container(benchmark::State& st, Container, GenInputs gen) {
   auto in = gen(st.range(0));
   Container c1(in.begin(), in.end());
   Container c2 = c1;
@@ -208,7 +208,7 @@ static void BM_Compare_same_container(benchmark::State& st, Container, GenInputs
 }
 
 template <class Container, class GenInputs>
-static void BM_Compare_different_containers(benchmark::State& st, Container, GenInputs gen) {
+void BM_Compare_different_containers(benchmark::State& st, Container, GenInputs gen) {
   auto in1 = gen(st.range(0));
   auto in2 = gen(st.range(0));
   Container c1(in1.begin(), in1.end());

libcxx/test/benchmarks/VariantBenchmarks.h

@@ -35,7 +35,7 @@ static auto genVariants(std::index_sequence<Is...>) {
 
   std::array<V, N> result = {};
   for (auto& v : result) {
-    v = fs[getRandomInteger(0ul, sizeof...(Is) - 1)]();
+    v = fs[getRandomInteger(std::size_t(0), sizeof...(Is) - 1)]();
   }
 
   return result;

libcxx/test/benchmarks/algorithms.partition_point.bench.cpp

@@ -6,6 +6,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// UNSUPPORTED: c++03, c++11, c++14
+
 #include <algorithm>
 #include <array>
 #include <cassert>

libcxx/test/benchmarks/algorithms/count.bench.cpp

@@ -6,6 +6,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+
 #include <algorithm>
 #include <benchmark/benchmark.h>
 #include <cstring>

libcxx/test/benchmarks/algorithms/equal.bench.cpp

@@ -6,6 +6,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+
 #include <algorithm>
 #include <benchmark/benchmark.h>
 #include <vector>

libcxx/test/benchmarks/algorithms/fill.bench.cpp

@@ -6,6 +6,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
+
 #include <algorithm>
 #include <benchmark/benchmark.h>
 #include <vector>

libcxx/test/benchmarks/algorithms/find.bench.cpp

@@ -6,6 +6,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+
 #include <algorithm>
 #include <benchmark/benchmark.h>
 #include <cstring>

libcxx/test/benchmarks/algorithms/for_each.bench.cpp

@@ -6,6 +6,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// UNSUPPORTED: c++03, c++11, c++14
+
 #include <algorithm>
 #include <benchmark/benchmark.h>
 #include <deque>

libcxx/test/benchmarks/algorithms/lexicographical_compare.bench.cpp

@@ -6,6 +6,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+
 #include <algorithm>
 #include <benchmark/benchmark.h>
 #include <vector>