bench: Fix initialization order in registration

The initialization order of global data structures in different
implementation units is undefined. Making use of this is essentially
gambling on what the linker does, the so-called [Static initialization
order fiasco](https://isocpp.org/wiki/faq/ctors#static-init-order).

In this case it apparently worked on Linux but failed on OpenBSD and
FreeBSD.

To create it on first use, make the registration structure local to
a function.

Fixes #8910.

2 files changed, 10 insertions, 9 deletions

diff --git a/src/bench/bench.cpp b/src/bench/bench.cpp
index 1bd9d06b80..3c9df4f713 100644
--- a/src/bench/bench.cpp
+++ b/src/bench/bench.cpp
@@ -9,7 +9,10 @@
 #include <iomanip>
 #include <sys/time.h>
 
-std::map<std::string, benchmark::BenchFunction> benchmark::BenchRunner::benchmarks;
+benchmark::BenchRunner::BenchmarkMap &benchmark::BenchRunner::benchmarks() {
+    static std::map<std::string, benchmark::BenchFunction> benchmarks_map;
+    return benchmarks_map;
+}
 
 static double gettimedouble(void) {
     struct timeval tv;
@@ -19,7 +22,7 @@ static double gettimedouble(void) {
 
 benchmark::BenchRunner::BenchRunner(std::string name, benchmark::BenchFunction func)
 {
-    benchmarks.insert(std::make_pair(name, func));
+    benchmarks().insert(std::make_pair(name, func));
 }
 
 void
@@ -29,12 +32,9 @@ benchmark::BenchRunner::RunAll(double elapsedTimeForOne)
     std::cout << "#Benchmark" << "," << "count" << "," << "min" << "," << "max" << "," << "average" << ","
               << "min_cycles" << "," << "max_cycles" << "," << "average_cycles" << "\n";
 
-    for (std::map<std::string,benchmark::BenchFunction>::iterator it = benchmarks.begin();
-         it != benchmarks.end(); ++it) {
-
-        State state(it->first, elapsedTimeForOne);
-        benchmark::BenchFunction& func = it->second;
-        func(state);
+    for (const auto &p: benchmarks()) {
+        State state(p.first, elapsedTimeForOne);
+        p.second(state);
     }
     perf_fini();
 }
diff --git a/src/bench/bench.h b/src/bench/bench.h
index 80dad6a8ef..0e7605c726 100644
--- a/src/bench/bench.h
+++ b/src/bench/bench.h
@@ -63,7 +63,8 @@ namespace benchmark {
 
     class BenchRunner
     {
-        static std::map<std::string, BenchFunction> benchmarks;
+        typedef std::map<std::string, BenchFunction> BenchmarkMap;
+        static BenchmarkMap &benchmarks();
 
     public:
         BenchRunner(std::string name, BenchFunction func);